2524 lines
92 KiB
C
2524 lines
92 KiB
C
/*
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* Physical memory management API
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*
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* Copyright 2011 Red Hat, Inc. and/or its affiliates
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*
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* Authors:
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* Avi Kivity <avi@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef MEMORY_H
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#define MEMORY_H
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#ifndef CONFIG_USER_ONLY
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#include "exec/cpu-common.h"
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#include "exec/hwaddr.h"
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#include "exec/memattrs.h"
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#include "exec/memop.h"
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#include "exec/ramlist.h"
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#include "qemu/bswap.h"
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#include "qemu/queue.h"
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#include "qemu/int128.h"
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#include "qemu/notify.h"
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#include "qom/object.h"
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#include "qemu/rcu.h"
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#define RAM_ADDR_INVALID (~(ram_addr_t)0)
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#define MAX_PHYS_ADDR_SPACE_BITS 62
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#define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
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#define TYPE_MEMORY_REGION "qemu:memory-region"
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#define MEMORY_REGION(obj) \
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OBJECT_CHECK(MemoryRegion, (obj), TYPE_MEMORY_REGION)
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#define TYPE_IOMMU_MEMORY_REGION "qemu:iommu-memory-region"
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#define IOMMU_MEMORY_REGION(obj) \
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OBJECT_CHECK(IOMMUMemoryRegion, (obj), TYPE_IOMMU_MEMORY_REGION)
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#define IOMMU_MEMORY_REGION_CLASS(klass) \
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OBJECT_CLASS_CHECK(IOMMUMemoryRegionClass, (klass), \
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TYPE_IOMMU_MEMORY_REGION)
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#define IOMMU_MEMORY_REGION_GET_CLASS(obj) \
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OBJECT_GET_CLASS(IOMMUMemoryRegionClass, (obj), \
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TYPE_IOMMU_MEMORY_REGION)
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extern bool global_dirty_log;
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typedef struct MemoryRegionOps MemoryRegionOps;
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struct ReservedRegion {
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hwaddr low;
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hwaddr high;
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unsigned type;
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};
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typedef struct IOMMUTLBEntry IOMMUTLBEntry;
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/* See address_space_translate: bit 0 is read, bit 1 is write. */
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typedef enum {
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IOMMU_NONE = 0,
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IOMMU_RO = 1,
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IOMMU_WO = 2,
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IOMMU_RW = 3,
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} IOMMUAccessFlags;
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#define IOMMU_ACCESS_FLAG(r, w) (((r) ? IOMMU_RO : 0) | ((w) ? IOMMU_WO : 0))
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struct IOMMUTLBEntry {
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AddressSpace *target_as;
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hwaddr iova;
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hwaddr translated_addr;
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hwaddr addr_mask; /* 0xfff = 4k translation */
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IOMMUAccessFlags perm;
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};
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/*
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* Bitmap for different IOMMUNotifier capabilities. Each notifier can
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* register with one or multiple IOMMU Notifier capability bit(s).
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*/
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typedef enum {
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IOMMU_NOTIFIER_NONE = 0,
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/* Notify cache invalidations */
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IOMMU_NOTIFIER_UNMAP = 0x1,
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/* Notify entry changes (newly created entries) */
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IOMMU_NOTIFIER_MAP = 0x2,
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} IOMMUNotifierFlag;
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#define IOMMU_NOTIFIER_ALL (IOMMU_NOTIFIER_MAP | IOMMU_NOTIFIER_UNMAP)
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struct IOMMUNotifier;
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typedef void (*IOMMUNotify)(struct IOMMUNotifier *notifier,
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IOMMUTLBEntry *data);
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struct IOMMUNotifier {
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IOMMUNotify notify;
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IOMMUNotifierFlag notifier_flags;
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/* Notify for address space range start <= addr <= end */
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hwaddr start;
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hwaddr end;
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int iommu_idx;
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QLIST_ENTRY(IOMMUNotifier) node;
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};
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typedef struct IOMMUNotifier IOMMUNotifier;
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/* RAM is pre-allocated and passed into qemu_ram_alloc_from_ptr */
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#define RAM_PREALLOC (1 << 0)
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/* RAM is mmap-ed with MAP_SHARED */
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#define RAM_SHARED (1 << 1)
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/* Only a portion of RAM (used_length) is actually used, and migrated.
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* This used_length size can change across reboots.
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*/
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#define RAM_RESIZEABLE (1 << 2)
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/* UFFDIO_ZEROPAGE is available on this RAMBlock to atomically
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* zero the page and wake waiting processes.
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* (Set during postcopy)
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*/
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#define RAM_UF_ZEROPAGE (1 << 3)
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/* RAM can be migrated */
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#define RAM_MIGRATABLE (1 << 4)
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/* RAM is a persistent kind memory */
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#define RAM_PMEM (1 << 5)
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static inline void iommu_notifier_init(IOMMUNotifier *n, IOMMUNotify fn,
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IOMMUNotifierFlag flags,
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hwaddr start, hwaddr end,
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int iommu_idx)
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{
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n->notify = fn;
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n->notifier_flags = flags;
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n->start = start;
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n->end = end;
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n->iommu_idx = iommu_idx;
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}
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/*
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* Memory region callbacks
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*/
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struct MemoryRegionOps {
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/* Read from the memory region. @addr is relative to @mr; @size is
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* in bytes. */
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uint64_t (*read)(void *opaque,
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hwaddr addr,
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unsigned size);
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/* Write to the memory region. @addr is relative to @mr; @size is
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* in bytes. */
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void (*write)(void *opaque,
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hwaddr addr,
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uint64_t data,
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unsigned size);
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MemTxResult (*read_with_attrs)(void *opaque,
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hwaddr addr,
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uint64_t *data,
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unsigned size,
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MemTxAttrs attrs);
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MemTxResult (*write_with_attrs)(void *opaque,
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hwaddr addr,
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uint64_t data,
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unsigned size,
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MemTxAttrs attrs);
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enum device_endian endianness;
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/* Guest-visible constraints: */
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struct {
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/* If nonzero, specify bounds on access sizes beyond which a machine
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* check is thrown.
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*/
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unsigned min_access_size;
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unsigned max_access_size;
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/* If true, unaligned accesses are supported. Otherwise unaligned
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* accesses throw machine checks.
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*/
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bool unaligned;
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/*
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* If present, and returns #false, the transaction is not accepted
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* by the device (and results in machine dependent behaviour such
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* as a machine check exception).
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*/
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bool (*accepts)(void *opaque, hwaddr addr,
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unsigned size, bool is_write,
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MemTxAttrs attrs);
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} valid;
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/* Internal implementation constraints: */
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struct {
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/* If nonzero, specifies the minimum size implemented. Smaller sizes
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* will be rounded upwards and a partial result will be returned.
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*/
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unsigned min_access_size;
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/* If nonzero, specifies the maximum size implemented. Larger sizes
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* will be done as a series of accesses with smaller sizes.
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*/
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unsigned max_access_size;
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/* If true, unaligned accesses are supported. Otherwise all accesses
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* are converted to (possibly multiple) naturally aligned accesses.
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*/
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bool unaligned;
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} impl;
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};
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typedef struct MemoryRegionClass {
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/* private */
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ObjectClass parent_class;
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} MemoryRegionClass;
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enum IOMMUMemoryRegionAttr {
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IOMMU_ATTR_SPAPR_TCE_FD
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};
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/**
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* IOMMUMemoryRegionClass:
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*
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* All IOMMU implementations need to subclass TYPE_IOMMU_MEMORY_REGION
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* and provide an implementation of at least the @translate method here
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* to handle requests to the memory region. Other methods are optional.
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*
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* The IOMMU implementation must use the IOMMU notifier infrastructure
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* to report whenever mappings are changed, by calling
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* memory_region_notify_iommu() (or, if necessary, by calling
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* memory_region_notify_one() for each registered notifier).
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*
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* Conceptually an IOMMU provides a mapping from input address
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* to an output TLB entry. If the IOMMU is aware of memory transaction
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* attributes and the output TLB entry depends on the transaction
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* attributes, we represent this using IOMMU indexes. Each index
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* selects a particular translation table that the IOMMU has:
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* @attrs_to_index returns the IOMMU index for a set of transaction attributes
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* @translate takes an input address and an IOMMU index
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* and the mapping returned can only depend on the input address and the
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* IOMMU index.
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*
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* Most IOMMUs don't care about the transaction attributes and support
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* only a single IOMMU index. A more complex IOMMU might have one index
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* for secure transactions and one for non-secure transactions.
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*/
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typedef struct IOMMUMemoryRegionClass {
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/* private */
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MemoryRegionClass parent_class;
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/*
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* Return a TLB entry that contains a given address.
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*
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* The IOMMUAccessFlags indicated via @flag are optional and may
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* be specified as IOMMU_NONE to indicate that the caller needs
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* the full translation information for both reads and writes. If
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* the access flags are specified then the IOMMU implementation
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* may use this as an optimization, to stop doing a page table
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* walk as soon as it knows that the requested permissions are not
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* allowed. If IOMMU_NONE is passed then the IOMMU must do the
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* full page table walk and report the permissions in the returned
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* IOMMUTLBEntry. (Note that this implies that an IOMMU may not
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* return different mappings for reads and writes.)
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*
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* The returned information remains valid while the caller is
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* holding the big QEMU lock or is inside an RCU critical section;
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* if the caller wishes to cache the mapping beyond that it must
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* register an IOMMU notifier so it can invalidate its cached
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* information when the IOMMU mapping changes.
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*
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* @iommu: the IOMMUMemoryRegion
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* @hwaddr: address to be translated within the memory region
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* @flag: requested access permissions
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* @iommu_idx: IOMMU index for the translation
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*/
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IOMMUTLBEntry (*translate)(IOMMUMemoryRegion *iommu, hwaddr addr,
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IOMMUAccessFlags flag, int iommu_idx);
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/* Returns minimum supported page size in bytes.
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* If this method is not provided then the minimum is assumed to
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* be TARGET_PAGE_SIZE.
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*
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* @iommu: the IOMMUMemoryRegion
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*/
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uint64_t (*get_min_page_size)(IOMMUMemoryRegion *iommu);
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/* Called when IOMMU Notifier flag changes (ie when the set of
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* events which IOMMU users are requesting notification for changes).
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* Optional method -- need not be provided if the IOMMU does not
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* need to know exactly which events must be notified.
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*
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* @iommu: the IOMMUMemoryRegion
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* @old_flags: events which previously needed to be notified
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* @new_flags: events which now need to be notified
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*
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* Returns 0 on success, or a negative errno; in particular
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* returns -EINVAL if the new flag bitmap is not supported by the
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* IOMMU memory region. In case of failure, the error object
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* must be created
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*/
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int (*notify_flag_changed)(IOMMUMemoryRegion *iommu,
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IOMMUNotifierFlag old_flags,
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IOMMUNotifierFlag new_flags,
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Error **errp);
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/* Called to handle memory_region_iommu_replay().
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*
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* The default implementation of memory_region_iommu_replay() is to
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* call the IOMMU translate method for every page in the address space
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* with flag == IOMMU_NONE and then call the notifier if translate
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* returns a valid mapping. If this method is implemented then it
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* overrides the default behaviour, and must provide the full semantics
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* of memory_region_iommu_replay(), by calling @notifier for every
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* translation present in the IOMMU.
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*
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* Optional method -- an IOMMU only needs to provide this method
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* if the default is inefficient or produces undesirable side effects.
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*
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* Note: this is not related to record-and-replay functionality.
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*/
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void (*replay)(IOMMUMemoryRegion *iommu, IOMMUNotifier *notifier);
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/* Get IOMMU misc attributes. This is an optional method that
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* can be used to allow users of the IOMMU to get implementation-specific
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* information. The IOMMU implements this method to handle calls
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* by IOMMU users to memory_region_iommu_get_attr() by filling in
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* the arbitrary data pointer for any IOMMUMemoryRegionAttr values that
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* the IOMMU supports. If the method is unimplemented then
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* memory_region_iommu_get_attr() will always return -EINVAL.
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*
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* @iommu: the IOMMUMemoryRegion
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* @attr: attribute being queried
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* @data: memory to fill in with the attribute data
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*
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* Returns 0 on success, or a negative errno; in particular
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* returns -EINVAL for unrecognized or unimplemented attribute types.
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*/
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int (*get_attr)(IOMMUMemoryRegion *iommu, enum IOMMUMemoryRegionAttr attr,
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void *data);
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/* Return the IOMMU index to use for a given set of transaction attributes.
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*
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* Optional method: if an IOMMU only supports a single IOMMU index then
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* the default implementation of memory_region_iommu_attrs_to_index()
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* will return 0.
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*
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* The indexes supported by an IOMMU must be contiguous, starting at 0.
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*
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* @iommu: the IOMMUMemoryRegion
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* @attrs: memory transaction attributes
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*/
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int (*attrs_to_index)(IOMMUMemoryRegion *iommu, MemTxAttrs attrs);
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/* Return the number of IOMMU indexes this IOMMU supports.
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*
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* Optional method: if this method is not provided, then
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* memory_region_iommu_num_indexes() will return 1, indicating that
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* only a single IOMMU index is supported.
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*
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* @iommu: the IOMMUMemoryRegion
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*/
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int (*num_indexes)(IOMMUMemoryRegion *iommu);
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} IOMMUMemoryRegionClass;
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typedef struct CoalescedMemoryRange CoalescedMemoryRange;
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typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;
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/** MemoryRegion:
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*
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* A struct representing a memory region.
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*/
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struct MemoryRegion {
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Object parent_obj;
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/* private: */
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/* The following fields should fit in a cache line */
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bool romd_mode;
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bool ram;
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bool subpage;
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bool readonly; /* For RAM regions */
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bool nonvolatile;
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bool rom_device;
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bool flush_coalesced_mmio;
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bool global_locking;
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uint8_t dirty_log_mask;
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bool is_iommu;
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RAMBlock *ram_block;
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Object *owner;
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const MemoryRegionOps *ops;
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void *opaque;
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MemoryRegion *container;
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Int128 size;
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hwaddr addr;
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void (*destructor)(MemoryRegion *mr);
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uint64_t align;
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bool terminates;
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bool ram_device;
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bool enabled;
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bool warning_printed; /* For reservations */
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uint8_t vga_logging_count;
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MemoryRegion *alias;
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hwaddr alias_offset;
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int32_t priority;
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QTAILQ_HEAD(, MemoryRegion) subregions;
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QTAILQ_ENTRY(MemoryRegion) subregions_link;
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QTAILQ_HEAD(, CoalescedMemoryRange) coalesced;
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const char *name;
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unsigned ioeventfd_nb;
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MemoryRegionIoeventfd *ioeventfds;
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};
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struct IOMMUMemoryRegion {
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MemoryRegion parent_obj;
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QLIST_HEAD(, IOMMUNotifier) iommu_notify;
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IOMMUNotifierFlag iommu_notify_flags;
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};
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#define IOMMU_NOTIFIER_FOREACH(n, mr) \
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QLIST_FOREACH((n), &(mr)->iommu_notify, node)
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/**
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* MemoryListener: callbacks structure for updates to the physical memory map
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*
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* Allows a component to adjust to changes in the guest-visible memory map.
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* Use with memory_listener_register() and memory_listener_unregister().
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*/
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struct MemoryListener {
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/**
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* @begin:
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*
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* Called at the beginning of an address space update transaction.
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* Followed by calls to #MemoryListener.region_add(),
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* #MemoryListener.region_del(), #MemoryListener.region_nop(),
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* #MemoryListener.log_start() and #MemoryListener.log_stop() in
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* increasing address order.
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*
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* @listener: The #MemoryListener.
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*/
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void (*begin)(MemoryListener *listener);
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/**
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* @commit:
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*
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* Called at the end of an address space update transaction,
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* after the last call to #MemoryListener.region_add(),
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* #MemoryListener.region_del() or #MemoryListener.region_nop(),
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* #MemoryListener.log_start() and #MemoryListener.log_stop().
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*
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* @listener: The #MemoryListener.
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*/
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void (*commit)(MemoryListener *listener);
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/**
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* @region_add:
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*
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* Called during an address space update transaction,
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* for a section of the address space that is new in this address space
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* space since the last transaction.
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*
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* @listener: The #MemoryListener.
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* @section: The new #MemoryRegionSection.
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*/
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void (*region_add)(MemoryListener *listener, MemoryRegionSection *section);
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/**
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* @region_del:
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*
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* Called during an address space update transaction,
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* for a section of the address space that has disappeared in the address
|
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* space since the last transaction.
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*
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* @listener: The #MemoryListener.
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* @section: The old #MemoryRegionSection.
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*/
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void (*region_del)(MemoryListener *listener, MemoryRegionSection *section);
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/**
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* @region_nop:
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*
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* Called during an address space update transaction,
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* for a section of the address space that is in the same place in the address
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* space as in the last transaction.
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*
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* @listener: The #MemoryListener.
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* @section: The #MemoryRegionSection.
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*/
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void (*region_nop)(MemoryListener *listener, MemoryRegionSection *section);
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/**
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* @log_start:
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*
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* Called during an address space update transaction, after
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* one of #MemoryListener.region_add(),#MemoryListener.region_del() or
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* #MemoryListener.region_nop(), if dirty memory logging clients have
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* become active since the last transaction.
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*
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* @listener: The #MemoryListener.
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* @section: The #MemoryRegionSection.
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* @old: A bitmap of dirty memory logging clients that were active in
|
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* the previous transaction.
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* @new: A bitmap of dirty memory logging clients that are active in
|
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* the current transaction.
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*/
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void (*log_start)(MemoryListener *listener, MemoryRegionSection *section,
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int old, int new);
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/**
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* @log_stop:
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*
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* Called during an address space update transaction, after
|
|
* one of #MemoryListener.region_add(), #MemoryListener.region_del() or
|
|
* #MemoryListener.region_nop() and possibly after
|
|
* #MemoryListener.log_start(), if dirty memory logging clients have
|
|
* become inactive since the last transaction.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
* @section: The #MemoryRegionSection.
|
|
* @old: A bitmap of dirty memory logging clients that were active in
|
|
* the previous transaction.
|
|
* @new: A bitmap of dirty memory logging clients that are active in
|
|
* the current transaction.
|
|
*/
|
|
void (*log_stop)(MemoryListener *listener, MemoryRegionSection *section,
|
|
int old, int new);
|
|
|
|
/**
|
|
* @log_sync:
|
|
*
|
|
* Called by memory_region_snapshot_and_clear_dirty() and
|
|
* memory_global_dirty_log_sync(), before accessing QEMU's "official"
|
|
* copy of the dirty memory bitmap for a #MemoryRegionSection.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
* @section: The #MemoryRegionSection.
|
|
*/
|
|
void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
|
|
|
|
/**
|
|
* @log_clear:
|
|
*
|
|
* Called before reading the dirty memory bitmap for a
|
|
* #MemoryRegionSection.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
* @section: The #MemoryRegionSection.
|
|
*/
|
|
void (*log_clear)(MemoryListener *listener, MemoryRegionSection *section);
|
|
|
|
/**
|
|
* @log_global_start:
|
|
*
|
|
* Called by memory_global_dirty_log_start(), which
|
|
* enables the %DIRTY_LOG_MIGRATION client on all memory regions in
|
|
* the address space. #MemoryListener.log_global_start() is also
|
|
* called when a #MemoryListener is added, if global dirty logging is
|
|
* active at that time.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
*/
|
|
void (*log_global_start)(MemoryListener *listener);
|
|
|
|
/**
|
|
* @log_global_stop:
|
|
*
|
|
* Called by memory_global_dirty_log_stop(), which
|
|
* disables the %DIRTY_LOG_MIGRATION client on all memory regions in
|
|
* the address space.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
*/
|
|
void (*log_global_stop)(MemoryListener *listener);
|
|
|
|
/**
|
|
* @log_global_after_sync:
|
|
*
|
|
* Called after reading the dirty memory bitmap
|
|
* for any #MemoryRegionSection.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
*/
|
|
void (*log_global_after_sync)(MemoryListener *listener);
|
|
|
|
/**
|
|
* @eventfd_add:
|
|
*
|
|
* Called during an address space update transaction,
|
|
* for a section of the address space that has had a new ioeventfd
|
|
* registration since the last transaction.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
* @section: The new #MemoryRegionSection.
|
|
* @match_data: The @match_data parameter for the new ioeventfd.
|
|
* @data: The @data parameter for the new ioeventfd.
|
|
* @e: The #EventNotifier parameter for the new ioeventfd.
|
|
*/
|
|
void (*eventfd_add)(MemoryListener *listener, MemoryRegionSection *section,
|
|
bool match_data, uint64_t data, EventNotifier *e);
|
|
|
|
/**
|
|
* @eventfd_del:
|
|
*
|
|
* Called during an address space update transaction,
|
|
* for a section of the address space that has dropped an ioeventfd
|
|
* registration since the last transaction.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
* @section: The new #MemoryRegionSection.
|
|
* @match_data: The @match_data parameter for the dropped ioeventfd.
|
|
* @data: The @data parameter for the dropped ioeventfd.
|
|
* @e: The #EventNotifier parameter for the dropped ioeventfd.
|
|
*/
|
|
void (*eventfd_del)(MemoryListener *listener, MemoryRegionSection *section,
|
|
bool match_data, uint64_t data, EventNotifier *e);
|
|
|
|
/**
|
|
* @coalesced_io_add:
|
|
*
|
|
* Called during an address space update transaction,
|
|
* for a section of the address space that has had a new coalesced
|
|
* MMIO range registration since the last transaction.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
* @section: The new #MemoryRegionSection.
|
|
* @addr: The starting address for the coalesced MMIO range.
|
|
* @len: The length of the coalesced MMIO range.
|
|
*/
|
|
void (*coalesced_io_add)(MemoryListener *listener, MemoryRegionSection *section,
|
|
hwaddr addr, hwaddr len);
|
|
|
|
/**
|
|
* @coalesced_io_del:
|
|
*
|
|
* Called during an address space update transaction,
|
|
* for a section of the address space that has dropped a coalesced
|
|
* MMIO range since the last transaction.
|
|
*
|
|
* @listener: The #MemoryListener.
|
|
* @section: The new #MemoryRegionSection.
|
|
* @addr: The starting address for the coalesced MMIO range.
|
|
* @len: The length of the coalesced MMIO range.
|
|
*/
|
|
void (*coalesced_io_del)(MemoryListener *listener, MemoryRegionSection *section,
|
|
hwaddr addr, hwaddr len);
|
|
/**
|
|
* @priority:
|
|
*
|
|
* Govern the order in which memory listeners are invoked. Lower priorities
|
|
* are invoked earlier for "add" or "start" callbacks, and later for "delete"
|
|
* or "stop" callbacks.
|
|
*/
|
|
unsigned priority;
|
|
|
|
/* private: */
|
|
AddressSpace *address_space;
|
|
QTAILQ_ENTRY(MemoryListener) link;
|
|
QTAILQ_ENTRY(MemoryListener) link_as;
|
|
};
|
|
|
|
/**
|
|
* AddressSpace: describes a mapping of addresses to #MemoryRegion objects
|
|
*/
|
|
struct AddressSpace {
|
|
/* private: */
|
|
struct rcu_head rcu;
|
|
char *name;
|
|
MemoryRegion *root;
|
|
|
|
/* Accessed via RCU. */
|
|
struct FlatView *current_map;
|
|
|
|
int ioeventfd_nb;
|
|
struct MemoryRegionIoeventfd *ioeventfds;
|
|
QTAILQ_HEAD(, MemoryListener) listeners;
|
|
QTAILQ_ENTRY(AddressSpace) address_spaces_link;
|
|
};
|
|
|
|
typedef struct AddressSpaceDispatch AddressSpaceDispatch;
|
|
typedef struct FlatRange FlatRange;
|
|
|
|
/* Flattened global view of current active memory hierarchy. Kept in sorted
|
|
* order.
|
|
*/
|
|
struct FlatView {
|
|
struct rcu_head rcu;
|
|
unsigned ref;
|
|
FlatRange *ranges;
|
|
unsigned nr;
|
|
unsigned nr_allocated;
|
|
struct AddressSpaceDispatch *dispatch;
|
|
MemoryRegion *root;
|
|
};
|
|
|
|
static inline FlatView *address_space_to_flatview(AddressSpace *as)
|
|
{
|
|
return atomic_rcu_read(&as->current_map);
|
|
}
|
|
|
|
|
|
/**
|
|
* MemoryRegionSection: describes a fragment of a #MemoryRegion
|
|
*
|
|
* @mr: the region, or %NULL if empty
|
|
* @fv: the flat view of the address space the region is mapped in
|
|
* @offset_within_region: the beginning of the section, relative to @mr's start
|
|
* @size: the size of the section; will not exceed @mr's boundaries
|
|
* @offset_within_address_space: the address of the first byte of the section
|
|
* relative to the region's address space
|
|
* @readonly: writes to this section are ignored
|
|
* @nonvolatile: this section is non-volatile
|
|
*/
|
|
struct MemoryRegionSection {
|
|
Int128 size;
|
|
MemoryRegion *mr;
|
|
FlatView *fv;
|
|
hwaddr offset_within_region;
|
|
hwaddr offset_within_address_space;
|
|
bool readonly;
|
|
bool nonvolatile;
|
|
};
|
|
|
|
static inline bool MemoryRegionSection_eq(MemoryRegionSection *a,
|
|
MemoryRegionSection *b)
|
|
{
|
|
return a->mr == b->mr &&
|
|
a->fv == b->fv &&
|
|
a->offset_within_region == b->offset_within_region &&
|
|
a->offset_within_address_space == b->offset_within_address_space &&
|
|
int128_eq(a->size, b->size) &&
|
|
a->readonly == b->readonly &&
|
|
a->nonvolatile == b->nonvolatile;
|
|
}
|
|
|
|
/**
|
|
* memory_region_init: Initialize a memory region
|
|
*
|
|
* The region typically acts as a container for other memory regions. Use
|
|
* memory_region_add_subregion() to add subregions.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: used for debugging; not visible to the user or ABI
|
|
* @size: size of the region; any subregions beyond this size will be clipped
|
|
*/
|
|
void memory_region_init(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size);
|
|
|
|
/**
|
|
* memory_region_ref: Add 1 to a memory region's reference count
|
|
*
|
|
* Whenever memory regions are accessed outside the BQL, they need to be
|
|
* preserved against hot-unplug. MemoryRegions actually do not have their
|
|
* own reference count; they piggyback on a QOM object, their "owner".
|
|
* This function adds a reference to the owner.
|
|
*
|
|
* All MemoryRegions must have an owner if they can disappear, even if the
|
|
* device they belong to operates exclusively under the BQL. This is because
|
|
* the region could be returned at any time by memory_region_find, and this
|
|
* is usually under guest control.
|
|
*
|
|
* @mr: the #MemoryRegion
|
|
*/
|
|
void memory_region_ref(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_unref: Remove 1 to a memory region's reference count
|
|
*
|
|
* Whenever memory regions are accessed outside the BQL, they need to be
|
|
* preserved against hot-unplug. MemoryRegions actually do not have their
|
|
* own reference count; they piggyback on a QOM object, their "owner".
|
|
* This function removes a reference to the owner and possibly destroys it.
|
|
*
|
|
* @mr: the #MemoryRegion
|
|
*/
|
|
void memory_region_unref(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_init_io: Initialize an I/O memory region.
|
|
*
|
|
* Accesses into the region will cause the callbacks in @ops to be called.
|
|
* if @size is nonzero, subregions will be clipped to @size.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @ops: a structure containing read and write callbacks to be used when
|
|
* I/O is performed on the region.
|
|
* @opaque: passed to the read and write callbacks of the @ops structure.
|
|
* @name: used for debugging; not visible to the user or ABI
|
|
* @size: size of the region.
|
|
*/
|
|
void memory_region_init_io(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const MemoryRegionOps *ops,
|
|
void *opaque,
|
|
const char *name,
|
|
uint64_t size);
|
|
|
|
/**
|
|
* memory_region_init_ram_nomigrate: Initialize RAM memory region. Accesses
|
|
* into the region will modify memory
|
|
* directly.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: size of the region.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*
|
|
* Note that this function does not do anything to cause the data in the
|
|
* RAM memory region to be migrated; that is the responsibility of the caller.
|
|
*/
|
|
void memory_region_init_ram_nomigrate(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
Error **errp);
|
|
|
|
/**
|
|
* memory_region_init_ram_shared_nomigrate: Initialize RAM memory region.
|
|
* Accesses into the region will
|
|
* modify memory directly.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: size of the region.
|
|
* @share: allow remapping RAM to different addresses
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*
|
|
* Note that this function is similar to memory_region_init_ram_nomigrate.
|
|
* The only difference is part of the RAM region can be remapped.
|
|
*/
|
|
void memory_region_init_ram_shared_nomigrate(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
bool share,
|
|
Error **errp);
|
|
|
|
/**
|
|
* memory_region_init_resizeable_ram: Initialize memory region with resizeable
|
|
* RAM. Accesses into the region will
|
|
* modify memory directly. Only an initial
|
|
* portion of this RAM is actually used.
|
|
* The used size can change across reboots.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: used size of the region.
|
|
* @max_size: max size of the region.
|
|
* @resized: callback to notify owner about used size change.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*
|
|
* Note that this function does not do anything to cause the data in the
|
|
* RAM memory region to be migrated; that is the responsibility of the caller.
|
|
*/
|
|
void memory_region_init_resizeable_ram(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
uint64_t max_size,
|
|
void (*resized)(const char*,
|
|
uint64_t length,
|
|
void *host),
|
|
Error **errp);
|
|
#ifdef CONFIG_POSIX
|
|
|
|
/**
|
|
* memory_region_init_ram_from_file: Initialize RAM memory region with a
|
|
* mmap-ed backend.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: size of the region.
|
|
* @align: alignment of the region base address; if 0, the default alignment
|
|
* (getpagesize()) will be used.
|
|
* @ram_flags: Memory region features:
|
|
* - RAM_SHARED: memory must be mmaped with the MAP_SHARED flag
|
|
* - RAM_PMEM: the memory is persistent memory
|
|
* Other bits are ignored now.
|
|
* @path: the path in which to allocate the RAM.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*
|
|
* Note that this function does not do anything to cause the data in the
|
|
* RAM memory region to be migrated; that is the responsibility of the caller.
|
|
*/
|
|
void memory_region_init_ram_from_file(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
uint64_t align,
|
|
uint32_t ram_flags,
|
|
const char *path,
|
|
Error **errp);
|
|
|
|
/**
|
|
* memory_region_init_ram_from_fd: Initialize RAM memory region with a
|
|
* mmap-ed backend.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: the name of the region.
|
|
* @size: size of the region.
|
|
* @share: %true if memory must be mmaped with the MAP_SHARED flag
|
|
* @fd: the fd to mmap.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*
|
|
* Note that this function does not do anything to cause the data in the
|
|
* RAM memory region to be migrated; that is the responsibility of the caller.
|
|
*/
|
|
void memory_region_init_ram_from_fd(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
bool share,
|
|
int fd,
|
|
Error **errp);
|
|
#endif
|
|
|
|
/**
|
|
* memory_region_init_ram_ptr: Initialize RAM memory region from a
|
|
* user-provided pointer. Accesses into the
|
|
* region will modify memory directly.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: size of the region.
|
|
* @ptr: memory to be mapped; must contain at least @size bytes.
|
|
*
|
|
* Note that this function does not do anything to cause the data in the
|
|
* RAM memory region to be migrated; that is the responsibility of the caller.
|
|
*/
|
|
void memory_region_init_ram_ptr(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
void *ptr);
|
|
|
|
/**
|
|
* memory_region_init_ram_device_ptr: Initialize RAM device memory region from
|
|
* a user-provided pointer.
|
|
*
|
|
* A RAM device represents a mapping to a physical device, such as to a PCI
|
|
* MMIO BAR of an vfio-pci assigned device. The memory region may be mapped
|
|
* into the VM address space and access to the region will modify memory
|
|
* directly. However, the memory region should not be included in a memory
|
|
* dump (device may not be enabled/mapped at the time of the dump), and
|
|
* operations incompatible with manipulating MMIO should be avoided. Replaces
|
|
* skip_dump flag.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: the name of the region.
|
|
* @size: size of the region.
|
|
* @ptr: memory to be mapped; must contain at least @size bytes.
|
|
*
|
|
* Note that this function does not do anything to cause the data in the
|
|
* RAM memory region to be migrated; that is the responsibility of the caller.
|
|
* (For RAM device memory regions, migrating the contents rarely makes sense.)
|
|
*/
|
|
void memory_region_init_ram_device_ptr(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
void *ptr);
|
|
|
|
/**
|
|
* memory_region_init_alias: Initialize a memory region that aliases all or a
|
|
* part of another memory region.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: used for debugging; not visible to the user or ABI
|
|
* @orig: the region to be referenced; @mr will be equivalent to
|
|
* @orig between @offset and @offset + @size - 1.
|
|
* @offset: start of the section in @orig to be referenced.
|
|
* @size: size of the region.
|
|
*/
|
|
void memory_region_init_alias(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
MemoryRegion *orig,
|
|
hwaddr offset,
|
|
uint64_t size);
|
|
|
|
/**
|
|
* memory_region_init_rom_nomigrate: Initialize a ROM memory region.
|
|
*
|
|
* This has the same effect as calling memory_region_init_ram_nomigrate()
|
|
* and then marking the resulting region read-only with
|
|
* memory_region_set_readonly().
|
|
*
|
|
* Note that this function does not do anything to cause the data in the
|
|
* RAM side of the memory region to be migrated; that is the responsibility
|
|
* of the caller.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: size of the region.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*/
|
|
void memory_region_init_rom_nomigrate(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
Error **errp);
|
|
|
|
/**
|
|
* memory_region_init_rom_device_nomigrate: Initialize a ROM memory region.
|
|
* Writes are handled via callbacks.
|
|
*
|
|
* Note that this function does not do anything to cause the data in the
|
|
* RAM side of the memory region to be migrated; that is the responsibility
|
|
* of the caller.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @ops: callbacks for write access handling (must not be NULL).
|
|
* @opaque: passed to the read and write callbacks of the @ops structure.
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: size of the region.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*/
|
|
void memory_region_init_rom_device_nomigrate(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const MemoryRegionOps *ops,
|
|
void *opaque,
|
|
const char *name,
|
|
uint64_t size,
|
|
Error **errp);
|
|
|
|
/**
|
|
* memory_region_init_iommu: Initialize a memory region of a custom type
|
|
* that translates addresses
|
|
*
|
|
* An IOMMU region translates addresses and forwards accesses to a target
|
|
* memory region.
|
|
*
|
|
* The IOMMU implementation must define a subclass of TYPE_IOMMU_MEMORY_REGION.
|
|
* @_iommu_mr should be a pointer to enough memory for an instance of
|
|
* that subclass, @instance_size is the size of that subclass, and
|
|
* @mrtypename is its name. This function will initialize @_iommu_mr as an
|
|
* instance of the subclass, and its methods will then be called to handle
|
|
* accesses to the memory region. See the documentation of
|
|
* #IOMMUMemoryRegionClass for further details.
|
|
*
|
|
* @_iommu_mr: the #IOMMUMemoryRegion to be initialized
|
|
* @instance_size: the IOMMUMemoryRegion subclass instance size
|
|
* @mrtypename: the type name of the #IOMMUMemoryRegion
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: used for debugging; not visible to the user or ABI
|
|
* @size: size of the region.
|
|
*/
|
|
void memory_region_init_iommu(void *_iommu_mr,
|
|
size_t instance_size,
|
|
const char *mrtypename,
|
|
Object *owner,
|
|
const char *name,
|
|
uint64_t size);
|
|
|
|
/**
|
|
* memory_region_init_ram - Initialize RAM memory region. Accesses into the
|
|
* region will modify memory directly.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized
|
|
* @owner: the object that tracks the region's reference count (must be
|
|
* TYPE_DEVICE or a subclass of TYPE_DEVICE, or NULL)
|
|
* @name: name of the memory region
|
|
* @size: size of the region in bytes
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*
|
|
* This function allocates RAM for a board model or device, and
|
|
* arranges for it to be migrated (by calling vmstate_register_ram()
|
|
* if @owner is a DeviceState, or vmstate_register_ram_global() if
|
|
* @owner is NULL).
|
|
*
|
|
* TODO: Currently we restrict @owner to being either NULL (for
|
|
* global RAM regions with no owner) or devices, so that we can
|
|
* give the RAM block a unique name for migration purposes.
|
|
* We should lift this restriction and allow arbitrary Objects.
|
|
* If you pass a non-NULL non-device @owner then we will assert.
|
|
*/
|
|
void memory_region_init_ram(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
Error **errp);
|
|
|
|
/**
|
|
* memory_region_init_rom: Initialize a ROM memory region.
|
|
*
|
|
* This has the same effect as calling memory_region_init_ram()
|
|
* and then marking the resulting region read-only with
|
|
* memory_region_set_readonly(). This includes arranging for the
|
|
* contents to be migrated.
|
|
*
|
|
* TODO: Currently we restrict @owner to being either NULL (for
|
|
* global RAM regions with no owner) or devices, so that we can
|
|
* give the RAM block a unique name for migration purposes.
|
|
* We should lift this restriction and allow arbitrary Objects.
|
|
* If you pass a non-NULL non-device @owner then we will assert.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: size of the region.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*/
|
|
void memory_region_init_rom(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const char *name,
|
|
uint64_t size,
|
|
Error **errp);
|
|
|
|
/**
|
|
* memory_region_init_rom_device: Initialize a ROM memory region.
|
|
* Writes are handled via callbacks.
|
|
*
|
|
* This function initializes a memory region backed by RAM for reads
|
|
* and callbacks for writes, and arranges for the RAM backing to
|
|
* be migrated (by calling vmstate_register_ram()
|
|
* if @owner is a DeviceState, or vmstate_register_ram_global() if
|
|
* @owner is NULL).
|
|
*
|
|
* TODO: Currently we restrict @owner to being either NULL (for
|
|
* global RAM regions with no owner) or devices, so that we can
|
|
* give the RAM block a unique name for migration purposes.
|
|
* We should lift this restriction and allow arbitrary Objects.
|
|
* If you pass a non-NULL non-device @owner then we will assert.
|
|
*
|
|
* @mr: the #MemoryRegion to be initialized.
|
|
* @owner: the object that tracks the region's reference count
|
|
* @ops: callbacks for write access handling (must not be NULL).
|
|
* @opaque: passed to the read and write callbacks of the @ops structure.
|
|
* @name: Region name, becomes part of RAMBlock name used in migration stream
|
|
* must be unique within any device
|
|
* @size: size of the region.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*/
|
|
void memory_region_init_rom_device(MemoryRegion *mr,
|
|
struct Object *owner,
|
|
const MemoryRegionOps *ops,
|
|
void *opaque,
|
|
const char *name,
|
|
uint64_t size,
|
|
Error **errp);
|
|
|
|
|
|
/**
|
|
* memory_region_owner: get a memory region's owner.
|
|
*
|
|
* @mr: the memory region being queried.
|
|
*/
|
|
struct Object *memory_region_owner(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_size: get a memory region's size.
|
|
*
|
|
* @mr: the memory region being queried.
|
|
*/
|
|
uint64_t memory_region_size(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_is_ram: check whether a memory region is random access
|
|
*
|
|
* Returns %true if a memory region is random access.
|
|
*
|
|
* @mr: the memory region being queried
|
|
*/
|
|
static inline bool memory_region_is_ram(MemoryRegion *mr)
|
|
{
|
|
return mr->ram;
|
|
}
|
|
|
|
/**
|
|
* memory_region_is_ram_device: check whether a memory region is a ram device
|
|
*
|
|
* Returns %true if a memory region is a device backed ram region
|
|
*
|
|
* @mr: the memory region being queried
|
|
*/
|
|
bool memory_region_is_ram_device(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_is_romd: check whether a memory region is in ROMD mode
|
|
*
|
|
* Returns %true if a memory region is a ROM device and currently set to allow
|
|
* direct reads.
|
|
*
|
|
* @mr: the memory region being queried
|
|
*/
|
|
static inline bool memory_region_is_romd(MemoryRegion *mr)
|
|
{
|
|
return mr->rom_device && mr->romd_mode;
|
|
}
|
|
|
|
/**
|
|
* memory_region_get_iommu: check whether a memory region is an iommu
|
|
*
|
|
* Returns pointer to IOMMUMemoryRegion if a memory region is an iommu,
|
|
* otherwise NULL.
|
|
*
|
|
* @mr: the memory region being queried
|
|
*/
|
|
static inline IOMMUMemoryRegion *memory_region_get_iommu(MemoryRegion *mr)
|
|
{
|
|
if (mr->alias) {
|
|
return memory_region_get_iommu(mr->alias);
|
|
}
|
|
if (mr->is_iommu) {
|
|
return (IOMMUMemoryRegion *) mr;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* memory_region_get_iommu_class_nocheck: returns iommu memory region class
|
|
* if an iommu or NULL if not
|
|
*
|
|
* Returns pointer to IOMMUMemoryRegionClass if a memory region is an iommu,
|
|
* otherwise NULL. This is fast path avoiding QOM checking, use with caution.
|
|
*
|
|
* @iommu_mr: the memory region being queried
|
|
*/
|
|
static inline IOMMUMemoryRegionClass *memory_region_get_iommu_class_nocheck(
|
|
IOMMUMemoryRegion *iommu_mr)
|
|
{
|
|
return (IOMMUMemoryRegionClass *) (((Object *)iommu_mr)->class);
|
|
}
|
|
|
|
#define memory_region_is_iommu(mr) (memory_region_get_iommu(mr) != NULL)
|
|
|
|
/**
|
|
* memory_region_iommu_get_min_page_size: get minimum supported page size
|
|
* for an iommu
|
|
*
|
|
* Returns minimum supported page size for an iommu.
|
|
*
|
|
* @iommu_mr: the memory region being queried
|
|
*/
|
|
uint64_t memory_region_iommu_get_min_page_size(IOMMUMemoryRegion *iommu_mr);
|
|
|
|
/**
|
|
* memory_region_notify_iommu: notify a change in an IOMMU translation entry.
|
|
*
|
|
* The notification type will be decided by entry.perm bits:
|
|
*
|
|
* - For UNMAP (cache invalidation) notifies: set entry.perm to IOMMU_NONE.
|
|
* - For MAP (newly added entry) notifies: set entry.perm to the
|
|
* permission of the page (which is definitely !IOMMU_NONE).
|
|
*
|
|
* Note: for any IOMMU implementation, an in-place mapping change
|
|
* should be notified with an UNMAP followed by a MAP.
|
|
*
|
|
* @iommu_mr: the memory region that was changed
|
|
* @iommu_idx: the IOMMU index for the translation table which has changed
|
|
* @entry: the new entry in the IOMMU translation table. The entry
|
|
* replaces all old entries for the same virtual I/O address range.
|
|
* Deleted entries have .@perm == 0.
|
|
*/
|
|
void memory_region_notify_iommu(IOMMUMemoryRegion *iommu_mr,
|
|
int iommu_idx,
|
|
IOMMUTLBEntry entry);
|
|
|
|
/**
|
|
* memory_region_notify_one: notify a change in an IOMMU translation
|
|
* entry to a single notifier
|
|
*
|
|
* This works just like memory_region_notify_iommu(), but it only
|
|
* notifies a specific notifier, not all of them.
|
|
*
|
|
* @notifier: the notifier to be notified
|
|
* @entry: the new entry in the IOMMU translation table. The entry
|
|
* replaces all old entries for the same virtual I/O address range.
|
|
* Deleted entries have .@perm == 0.
|
|
*/
|
|
void memory_region_notify_one(IOMMUNotifier *notifier,
|
|
IOMMUTLBEntry *entry);
|
|
|
|
/**
|
|
* memory_region_register_iommu_notifier: register a notifier for changes to
|
|
* IOMMU translation entries.
|
|
*
|
|
* Returns 0 on success, or a negative errno otherwise. In particular,
|
|
* -EINVAL indicates that at least one of the attributes of the notifier
|
|
* is not supported (flag/range) by the IOMMU memory region. In case of error
|
|
* the error object must be created.
|
|
*
|
|
* @mr: the memory region to observe
|
|
* @n: the IOMMUNotifier to be added; the notify callback receives a
|
|
* pointer to an #IOMMUTLBEntry as the opaque value; the pointer
|
|
* ceases to be valid on exit from the notifier.
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*/
|
|
int memory_region_register_iommu_notifier(MemoryRegion *mr,
|
|
IOMMUNotifier *n, Error **errp);
|
|
|
|
/**
|
|
* memory_region_iommu_replay: replay existing IOMMU translations to
|
|
* a notifier with the minimum page granularity returned by
|
|
* mr->iommu_ops->get_page_size().
|
|
*
|
|
* Note: this is not related to record-and-replay functionality.
|
|
*
|
|
* @iommu_mr: the memory region to observe
|
|
* @n: the notifier to which to replay iommu mappings
|
|
*/
|
|
void memory_region_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n);
|
|
|
|
/**
|
|
* memory_region_unregister_iommu_notifier: unregister a notifier for
|
|
* changes to IOMMU translation entries.
|
|
*
|
|
* @mr: the memory region which was observed and for which notity_stopped()
|
|
* needs to be called
|
|
* @n: the notifier to be removed.
|
|
*/
|
|
void memory_region_unregister_iommu_notifier(MemoryRegion *mr,
|
|
IOMMUNotifier *n);
|
|
|
|
/**
|
|
* memory_region_iommu_get_attr: return an IOMMU attr if get_attr() is
|
|
* defined on the IOMMU.
|
|
*
|
|
* Returns 0 on success, or a negative errno otherwise. In particular,
|
|
* -EINVAL indicates that the IOMMU does not support the requested
|
|
* attribute.
|
|
*
|
|
* @iommu_mr: the memory region
|
|
* @attr: the requested attribute
|
|
* @data: a pointer to the requested attribute data
|
|
*/
|
|
int memory_region_iommu_get_attr(IOMMUMemoryRegion *iommu_mr,
|
|
enum IOMMUMemoryRegionAttr attr,
|
|
void *data);
|
|
|
|
/**
|
|
* memory_region_iommu_attrs_to_index: return the IOMMU index to
|
|
* use for translations with the given memory transaction attributes.
|
|
*
|
|
* @iommu_mr: the memory region
|
|
* @attrs: the memory transaction attributes
|
|
*/
|
|
int memory_region_iommu_attrs_to_index(IOMMUMemoryRegion *iommu_mr,
|
|
MemTxAttrs attrs);
|
|
|
|
/**
|
|
* memory_region_iommu_num_indexes: return the total number of IOMMU
|
|
* indexes that this IOMMU supports.
|
|
*
|
|
* @iommu_mr: the memory region
|
|
*/
|
|
int memory_region_iommu_num_indexes(IOMMUMemoryRegion *iommu_mr);
|
|
|
|
/**
|
|
* memory_region_name: get a memory region's name
|
|
*
|
|
* Returns the string that was used to initialize the memory region.
|
|
*
|
|
* @mr: the memory region being queried
|
|
*/
|
|
const char *memory_region_name(const MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_is_logging: return whether a memory region is logging writes
|
|
*
|
|
* Returns %true if the memory region is logging writes for the given client
|
|
*
|
|
* @mr: the memory region being queried
|
|
* @client: the client being queried
|
|
*/
|
|
bool memory_region_is_logging(MemoryRegion *mr, uint8_t client);
|
|
|
|
/**
|
|
* memory_region_get_dirty_log_mask: return the clients for which a
|
|
* memory region is logging writes.
|
|
*
|
|
* Returns a bitmap of clients, in which the DIRTY_MEMORY_* constants
|
|
* are the bit indices.
|
|
*
|
|
* @mr: the memory region being queried
|
|
*/
|
|
uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_is_rom: check whether a memory region is ROM
|
|
*
|
|
* Returns %true if a memory region is read-only memory.
|
|
*
|
|
* @mr: the memory region being queried
|
|
*/
|
|
static inline bool memory_region_is_rom(MemoryRegion *mr)
|
|
{
|
|
return mr->ram && mr->readonly;
|
|
}
|
|
|
|
/**
|
|
* memory_region_is_nonvolatile: check whether a memory region is non-volatile
|
|
*
|
|
* Returns %true is a memory region is non-volatile memory.
|
|
*
|
|
* @mr: the memory region being queried
|
|
*/
|
|
static inline bool memory_region_is_nonvolatile(MemoryRegion *mr)
|
|
{
|
|
return mr->nonvolatile;
|
|
}
|
|
|
|
/**
|
|
* memory_region_get_fd: Get a file descriptor backing a RAM memory region.
|
|
*
|
|
* Returns a file descriptor backing a file-based RAM memory region,
|
|
* or -1 if the region is not a file-based RAM memory region.
|
|
*
|
|
* @mr: the RAM or alias memory region being queried.
|
|
*/
|
|
int memory_region_get_fd(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_from_host: Convert a pointer into a RAM memory region
|
|
* and an offset within it.
|
|
*
|
|
* Given a host pointer inside a RAM memory region (created with
|
|
* memory_region_init_ram() or memory_region_init_ram_ptr()), return
|
|
* the MemoryRegion and the offset within it.
|
|
*
|
|
* Use with care; by the time this function returns, the returned pointer is
|
|
* not protected by RCU anymore. If the caller is not within an RCU critical
|
|
* section and does not hold the iothread lock, it must have other means of
|
|
* protecting the pointer, such as a reference to the region that includes
|
|
* the incoming ram_addr_t.
|
|
*
|
|
* @ptr: the host pointer to be converted
|
|
* @offset: the offset within memory region
|
|
*/
|
|
MemoryRegion *memory_region_from_host(void *ptr, ram_addr_t *offset);
|
|
|
|
/**
|
|
* memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
|
|
*
|
|
* Returns a host pointer to a RAM memory region (created with
|
|
* memory_region_init_ram() or memory_region_init_ram_ptr()).
|
|
*
|
|
* Use with care; by the time this function returns, the returned pointer is
|
|
* not protected by RCU anymore. If the caller is not within an RCU critical
|
|
* section and does not hold the iothread lock, it must have other means of
|
|
* protecting the pointer, such as a reference to the region that includes
|
|
* the incoming ram_addr_t.
|
|
*
|
|
* @mr: the memory region being queried.
|
|
*/
|
|
void *memory_region_get_ram_ptr(MemoryRegion *mr);
|
|
|
|
/* memory_region_ram_resize: Resize a RAM region.
|
|
*
|
|
* Only legal before guest might have detected the memory size: e.g. on
|
|
* incoming migration, or right after reset.
|
|
*
|
|
* @mr: a memory region created with @memory_region_init_resizeable_ram.
|
|
* @newsize: the new size the region
|
|
* @errp: pointer to Error*, to store an error if it happens.
|
|
*/
|
|
void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize,
|
|
Error **errp);
|
|
|
|
/**
|
|
* memory_region_msync: Synchronize selected address range of
|
|
* a memory mapped region
|
|
*
|
|
* @mr: the memory region to be msync
|
|
* @addr: the initial address of the range to be sync
|
|
* @size: the size of the range to be sync
|
|
*/
|
|
void memory_region_msync(MemoryRegion *mr, hwaddr addr, hwaddr size);
|
|
|
|
/**
|
|
* memory_region_writeback: Trigger cache writeback for
|
|
* selected address range
|
|
*
|
|
* @mr: the memory region to be updated
|
|
* @addr: the initial address of the range to be written back
|
|
* @size: the size of the range to be written back
|
|
*/
|
|
void memory_region_writeback(MemoryRegion *mr, hwaddr addr, hwaddr size);
|
|
|
|
/**
|
|
* memory_region_set_log: Turn dirty logging on or off for a region.
|
|
*
|
|
* Turns dirty logging on or off for a specified client (display, migration).
|
|
* Only meaningful for RAM regions.
|
|
*
|
|
* @mr: the memory region being updated.
|
|
* @log: whether dirty logging is to be enabled or disabled.
|
|
* @client: the user of the logging information; %DIRTY_MEMORY_VGA only.
|
|
*/
|
|
void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client);
|
|
|
|
/**
|
|
* memory_region_set_dirty: Mark a range of bytes as dirty in a memory region.
|
|
*
|
|
* Marks a range of bytes as dirty, after it has been dirtied outside
|
|
* guest code.
|
|
*
|
|
* @mr: the memory region being dirtied.
|
|
* @addr: the address (relative to the start of the region) being dirtied.
|
|
* @size: size of the range being dirtied.
|
|
*/
|
|
void memory_region_set_dirty(MemoryRegion *mr, hwaddr addr,
|
|
hwaddr size);
|
|
|
|
/**
|
|
* memory_region_clear_dirty_bitmap - clear dirty bitmap for memory range
|
|
*
|
|
* This function is called when the caller wants to clear the remote
|
|
* dirty bitmap of a memory range within the memory region. This can
|
|
* be used by e.g. KVM to manually clear dirty log when
|
|
* KVM_CAP_MANUAL_DIRTY_LOG_PROTECT is declared support by the host
|
|
* kernel.
|
|
*
|
|
* @mr: the memory region to clear the dirty log upon
|
|
* @start: start address offset within the memory region
|
|
* @len: length of the memory region to clear dirty bitmap
|
|
*/
|
|
void memory_region_clear_dirty_bitmap(MemoryRegion *mr, hwaddr start,
|
|
hwaddr len);
|
|
|
|
/**
|
|
* memory_region_snapshot_and_clear_dirty: Get a snapshot of the dirty
|
|
* bitmap and clear it.
|
|
*
|
|
* Creates a snapshot of the dirty bitmap, clears the dirty bitmap and
|
|
* returns the snapshot. The snapshot can then be used to query dirty
|
|
* status, using memory_region_snapshot_get_dirty. Snapshotting allows
|
|
* querying the same page multiple times, which is especially useful for
|
|
* display updates where the scanlines often are not page aligned.
|
|
*
|
|
* The dirty bitmap region which gets copyed into the snapshot (and
|
|
* cleared afterwards) can be larger than requested. The boundaries
|
|
* are rounded up/down so complete bitmap longs (covering 64 pages on
|
|
* 64bit hosts) can be copied over into the bitmap snapshot. Which
|
|
* isn't a problem for display updates as the extra pages are outside
|
|
* the visible area, and in case the visible area changes a full
|
|
* display redraw is due anyway. Should other use cases for this
|
|
* function emerge we might have to revisit this implementation
|
|
* detail.
|
|
*
|
|
* Use g_free to release DirtyBitmapSnapshot.
|
|
*
|
|
* @mr: the memory region being queried.
|
|
* @addr: the address (relative to the start of the region) being queried.
|
|
* @size: the size of the range being queried.
|
|
* @client: the user of the logging information; typically %DIRTY_MEMORY_VGA.
|
|
*/
|
|
DirtyBitmapSnapshot *memory_region_snapshot_and_clear_dirty(MemoryRegion *mr,
|
|
hwaddr addr,
|
|
hwaddr size,
|
|
unsigned client);
|
|
|
|
/**
|
|
* memory_region_snapshot_get_dirty: Check whether a range of bytes is dirty
|
|
* in the specified dirty bitmap snapshot.
|
|
*
|
|
* @mr: the memory region being queried.
|
|
* @snap: the dirty bitmap snapshot
|
|
* @addr: the address (relative to the start of the region) being queried.
|
|
* @size: the size of the range being queried.
|
|
*/
|
|
bool memory_region_snapshot_get_dirty(MemoryRegion *mr,
|
|
DirtyBitmapSnapshot *snap,
|
|
hwaddr addr, hwaddr size);
|
|
|
|
/**
|
|
* memory_region_reset_dirty: Mark a range of pages as clean, for a specified
|
|
* client.
|
|
*
|
|
* Marks a range of pages as no longer dirty.
|
|
*
|
|
* @mr: the region being updated.
|
|
* @addr: the start of the subrange being cleaned.
|
|
* @size: the size of the subrange being cleaned.
|
|
* @client: the user of the logging information; %DIRTY_MEMORY_MIGRATION or
|
|
* %DIRTY_MEMORY_VGA.
|
|
*/
|
|
void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
|
|
hwaddr size, unsigned client);
|
|
|
|
/**
|
|
* memory_region_flush_rom_device: Mark a range of pages dirty and invalidate
|
|
* TBs (for self-modifying code).
|
|
*
|
|
* The MemoryRegionOps->write() callback of a ROM device must use this function
|
|
* to mark byte ranges that have been modified internally, such as by directly
|
|
* accessing the memory returned by memory_region_get_ram_ptr().
|
|
*
|
|
* This function marks the range dirty and invalidates TBs so that TCG can
|
|
* detect self-modifying code.
|
|
*
|
|
* @mr: the region being flushed.
|
|
* @addr: the start, relative to the start of the region, of the range being
|
|
* flushed.
|
|
* @size: the size, in bytes, of the range being flushed.
|
|
*/
|
|
void memory_region_flush_rom_device(MemoryRegion *mr, hwaddr addr, hwaddr size);
|
|
|
|
/**
|
|
* memory_region_set_readonly: Turn a memory region read-only (or read-write)
|
|
*
|
|
* Allows a memory region to be marked as read-only (turning it into a ROM).
|
|
* only useful on RAM regions.
|
|
*
|
|
* @mr: the region being updated.
|
|
* @readonly: whether rhe region is to be ROM or RAM.
|
|
*/
|
|
void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
|
|
|
|
/**
|
|
* memory_region_set_nonvolatile: Turn a memory region non-volatile
|
|
*
|
|
* Allows a memory region to be marked as non-volatile.
|
|
* only useful on RAM regions.
|
|
*
|
|
* @mr: the region being updated.
|
|
* @nonvolatile: whether rhe region is to be non-volatile.
|
|
*/
|
|
void memory_region_set_nonvolatile(MemoryRegion *mr, bool nonvolatile);
|
|
|
|
/**
|
|
* memory_region_rom_device_set_romd: enable/disable ROMD mode
|
|
*
|
|
* Allows a ROM device (initialized with memory_region_init_rom_device() to
|
|
* set to ROMD mode (default) or MMIO mode. When it is in ROMD mode, the
|
|
* device is mapped to guest memory and satisfies read access directly.
|
|
* When in MMIO mode, reads are forwarded to the #MemoryRegion.read function.
|
|
* Writes are always handled by the #MemoryRegion.write function.
|
|
*
|
|
* @mr: the memory region to be updated
|
|
* @romd_mode: %true to put the region into ROMD mode
|
|
*/
|
|
void memory_region_rom_device_set_romd(MemoryRegion *mr, bool romd_mode);
|
|
|
|
/**
|
|
* memory_region_set_coalescing: Enable memory coalescing for the region.
|
|
*
|
|
* Enabled writes to a region to be queued for later processing. MMIO ->write
|
|
* callbacks may be delayed until a non-coalesced MMIO is issued.
|
|
* Only useful for IO regions. Roughly similar to write-combining hardware.
|
|
*
|
|
* @mr: the memory region to be write coalesced
|
|
*/
|
|
void memory_region_set_coalescing(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_add_coalescing: Enable memory coalescing for a sub-range of
|
|
* a region.
|
|
*
|
|
* Like memory_region_set_coalescing(), but works on a sub-range of a region.
|
|
* Multiple calls can be issued coalesced disjoint ranges.
|
|
*
|
|
* @mr: the memory region to be updated.
|
|
* @offset: the start of the range within the region to be coalesced.
|
|
* @size: the size of the subrange to be coalesced.
|
|
*/
|
|
void memory_region_add_coalescing(MemoryRegion *mr,
|
|
hwaddr offset,
|
|
uint64_t size);
|
|
|
|
/**
|
|
* memory_region_clear_coalescing: Disable MMIO coalescing for the region.
|
|
*
|
|
* Disables any coalescing caused by memory_region_set_coalescing() or
|
|
* memory_region_add_coalescing(). Roughly equivalent to uncacheble memory
|
|
* hardware.
|
|
*
|
|
* @mr: the memory region to be updated.
|
|
*/
|
|
void memory_region_clear_coalescing(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_set_flush_coalesced: Enforce memory coalescing flush before
|
|
* accesses.
|
|
*
|
|
* Ensure that pending coalesced MMIO request are flushed before the memory
|
|
* region is accessed. This property is automatically enabled for all regions
|
|
* passed to memory_region_set_coalescing() and memory_region_add_coalescing().
|
|
*
|
|
* @mr: the memory region to be updated.
|
|
*/
|
|
void memory_region_set_flush_coalesced(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_clear_flush_coalesced: Disable memory coalescing flush before
|
|
* accesses.
|
|
*
|
|
* Clear the automatic coalesced MMIO flushing enabled via
|
|
* memory_region_set_flush_coalesced. Note that this service has no effect on
|
|
* memory regions that have MMIO coalescing enabled for themselves. For them,
|
|
* automatic flushing will stop once coalescing is disabled.
|
|
*
|
|
* @mr: the memory region to be updated.
|
|
*/
|
|
void memory_region_clear_flush_coalesced(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_clear_global_locking: Declares that access processing does
|
|
* not depend on the QEMU global lock.
|
|
*
|
|
* By clearing this property, accesses to the memory region will be processed
|
|
* outside of QEMU's global lock (unless the lock is held on when issuing the
|
|
* access request). In this case, the device model implementing the access
|
|
* handlers is responsible for synchronization of concurrency.
|
|
*
|
|
* @mr: the memory region to be updated.
|
|
*/
|
|
void memory_region_clear_global_locking(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_add_eventfd: Request an eventfd to be triggered when a word
|
|
* is written to a location.
|
|
*
|
|
* Marks a word in an IO region (initialized with memory_region_init_io())
|
|
* as a trigger for an eventfd event. The I/O callback will not be called.
|
|
* The caller must be prepared to handle failure (that is, take the required
|
|
* action if the callback _is_ called).
|
|
*
|
|
* @mr: the memory region being updated.
|
|
* @addr: the address within @mr that is to be monitored
|
|
* @size: the size of the access to trigger the eventfd
|
|
* @match_data: whether to match against @data, instead of just @addr
|
|
* @data: the data to match against the guest write
|
|
* @e: event notifier to be triggered when @addr, @size, and @data all match.
|
|
**/
|
|
void memory_region_add_eventfd(MemoryRegion *mr,
|
|
hwaddr addr,
|
|
unsigned size,
|
|
bool match_data,
|
|
uint64_t data,
|
|
EventNotifier *e);
|
|
|
|
/**
|
|
* memory_region_del_eventfd: Cancel an eventfd.
|
|
*
|
|
* Cancels an eventfd trigger requested by a previous
|
|
* memory_region_add_eventfd() call.
|
|
*
|
|
* @mr: the memory region being updated.
|
|
* @addr: the address within @mr that is to be monitored
|
|
* @size: the size of the access to trigger the eventfd
|
|
* @match_data: whether to match against @data, instead of just @addr
|
|
* @data: the data to match against the guest write
|
|
* @e: event notifier to be triggered when @addr, @size, and @data all match.
|
|
*/
|
|
void memory_region_del_eventfd(MemoryRegion *mr,
|
|
hwaddr addr,
|
|
unsigned size,
|
|
bool match_data,
|
|
uint64_t data,
|
|
EventNotifier *e);
|
|
|
|
/**
|
|
* memory_region_add_subregion: Add a subregion to a container.
|
|
*
|
|
* Adds a subregion at @offset. The subregion may not overlap with other
|
|
* subregions (except for those explicitly marked as overlapping). A region
|
|
* may only be added once as a subregion (unless removed with
|
|
* memory_region_del_subregion()); use memory_region_init_alias() if you
|
|
* want a region to be a subregion in multiple locations.
|
|
*
|
|
* @mr: the region to contain the new subregion; must be a container
|
|
* initialized with memory_region_init().
|
|
* @offset: the offset relative to @mr where @subregion is added.
|
|
* @subregion: the subregion to be added.
|
|
*/
|
|
void memory_region_add_subregion(MemoryRegion *mr,
|
|
hwaddr offset,
|
|
MemoryRegion *subregion);
|
|
/**
|
|
* memory_region_add_subregion_overlap: Add a subregion to a container
|
|
* with overlap.
|
|
*
|
|
* Adds a subregion at @offset. The subregion may overlap with other
|
|
* subregions. Conflicts are resolved by having a higher @priority hide a
|
|
* lower @priority. Subregions without priority are taken as @priority 0.
|
|
* A region may only be added once as a subregion (unless removed with
|
|
* memory_region_del_subregion()); use memory_region_init_alias() if you
|
|
* want a region to be a subregion in multiple locations.
|
|
*
|
|
* @mr: the region to contain the new subregion; must be a container
|
|
* initialized with memory_region_init().
|
|
* @offset: the offset relative to @mr where @subregion is added.
|
|
* @subregion: the subregion to be added.
|
|
* @priority: used for resolving overlaps; highest priority wins.
|
|
*/
|
|
void memory_region_add_subregion_overlap(MemoryRegion *mr,
|
|
hwaddr offset,
|
|
MemoryRegion *subregion,
|
|
int priority);
|
|
|
|
/**
|
|
* memory_region_get_ram_addr: Get the ram address associated with a memory
|
|
* region
|
|
*
|
|
* @mr: the region to be queried
|
|
*/
|
|
ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr);
|
|
|
|
uint64_t memory_region_get_alignment(const MemoryRegion *mr);
|
|
/**
|
|
* memory_region_del_subregion: Remove a subregion.
|
|
*
|
|
* Removes a subregion from its container.
|
|
*
|
|
* @mr: the container to be updated.
|
|
* @subregion: the region being removed; must be a current subregion of @mr.
|
|
*/
|
|
void memory_region_del_subregion(MemoryRegion *mr,
|
|
MemoryRegion *subregion);
|
|
|
|
/*
|
|
* memory_region_set_enabled: dynamically enable or disable a region
|
|
*
|
|
* Enables or disables a memory region. A disabled memory region
|
|
* ignores all accesses to itself and its subregions. It does not
|
|
* obscure sibling subregions with lower priority - it simply behaves as
|
|
* if it was removed from the hierarchy.
|
|
*
|
|
* Regions default to being enabled.
|
|
*
|
|
* @mr: the region to be updated
|
|
* @enabled: whether to enable or disable the region
|
|
*/
|
|
void memory_region_set_enabled(MemoryRegion *mr, bool enabled);
|
|
|
|
/*
|
|
* memory_region_set_address: dynamically update the address of a region
|
|
*
|
|
* Dynamically updates the address of a region, relative to its container.
|
|
* May be used on regions are currently part of a memory hierarchy.
|
|
*
|
|
* @mr: the region to be updated
|
|
* @addr: new address, relative to container region
|
|
*/
|
|
void memory_region_set_address(MemoryRegion *mr, hwaddr addr);
|
|
|
|
/*
|
|
* memory_region_set_size: dynamically update the size of a region.
|
|
*
|
|
* Dynamically updates the size of a region.
|
|
*
|
|
* @mr: the region to be updated
|
|
* @size: used size of the region.
|
|
*/
|
|
void memory_region_set_size(MemoryRegion *mr, uint64_t size);
|
|
|
|
/*
|
|
* memory_region_set_alias_offset: dynamically update a memory alias's offset
|
|
*
|
|
* Dynamically updates the offset into the target region that an alias points
|
|
* to, as if the fourth argument to memory_region_init_alias() has changed.
|
|
*
|
|
* @mr: the #MemoryRegion to be updated; should be an alias.
|
|
* @offset: the new offset into the target memory region
|
|
*/
|
|
void memory_region_set_alias_offset(MemoryRegion *mr,
|
|
hwaddr offset);
|
|
|
|
/**
|
|
* memory_region_present: checks if an address relative to a @container
|
|
* translates into #MemoryRegion within @container
|
|
*
|
|
* Answer whether a #MemoryRegion within @container covers the address
|
|
* @addr.
|
|
*
|
|
* @container: a #MemoryRegion within which @addr is a relative address
|
|
* @addr: the area within @container to be searched
|
|
*/
|
|
bool memory_region_present(MemoryRegion *container, hwaddr addr);
|
|
|
|
/**
|
|
* memory_region_is_mapped: returns true if #MemoryRegion is mapped
|
|
* into any address space.
|
|
*
|
|
* @mr: a #MemoryRegion which should be checked if it's mapped
|
|
*/
|
|
bool memory_region_is_mapped(MemoryRegion *mr);
|
|
|
|
/**
|
|
* memory_region_find: translate an address/size relative to a
|
|
* MemoryRegion into a #MemoryRegionSection.
|
|
*
|
|
* Locates the first #MemoryRegion within @mr that overlaps the range
|
|
* given by @addr and @size.
|
|
*
|
|
* Returns a #MemoryRegionSection that describes a contiguous overlap.
|
|
* It will have the following characteristics:
|
|
* - @size = 0 iff no overlap was found
|
|
* - @mr is non-%NULL iff an overlap was found
|
|
*
|
|
* Remember that in the return value the @offset_within_region is
|
|
* relative to the returned region (in the .@mr field), not to the
|
|
* @mr argument.
|
|
*
|
|
* Similarly, the .@offset_within_address_space is relative to the
|
|
* address space that contains both regions, the passed and the
|
|
* returned one. However, in the special case where the @mr argument
|
|
* has no container (and thus is the root of the address space), the
|
|
* following will hold:
|
|
* - @offset_within_address_space >= @addr
|
|
* - @offset_within_address_space + .@size <= @addr + @size
|
|
*
|
|
* @mr: a MemoryRegion within which @addr is a relative address
|
|
* @addr: start of the area within @as to be searched
|
|
* @size: size of the area to be searched
|
|
*/
|
|
MemoryRegionSection memory_region_find(MemoryRegion *mr,
|
|
hwaddr addr, uint64_t size);
|
|
|
|
/**
|
|
* memory_global_dirty_log_sync: synchronize the dirty log for all memory
|
|
*
|
|
* Synchronizes the dirty page log for all address spaces.
|
|
*/
|
|
void memory_global_dirty_log_sync(void);
|
|
|
|
/**
|
|
* memory_global_dirty_log_sync: synchronize the dirty log for all memory
|
|
*
|
|
* Synchronizes the vCPUs with a thread that is reading the dirty bitmap.
|
|
* This function must be called after the dirty log bitmap is cleared, and
|
|
* before dirty guest memory pages are read. If you are using
|
|
* #DirtyBitmapSnapshot, memory_region_snapshot_and_clear_dirty() takes
|
|
* care of doing this.
|
|
*/
|
|
void memory_global_after_dirty_log_sync(void);
|
|
|
|
/**
|
|
* memory_region_transaction_begin: Start a transaction.
|
|
*
|
|
* During a transaction, changes will be accumulated and made visible
|
|
* only when the transaction ends (is committed).
|
|
*/
|
|
void memory_region_transaction_begin(void);
|
|
|
|
/**
|
|
* memory_region_transaction_commit: Commit a transaction and make changes
|
|
* visible to the guest.
|
|
*/
|
|
void memory_region_transaction_commit(void);
|
|
|
|
/**
|
|
* memory_listener_register: register callbacks to be called when memory
|
|
* sections are mapped or unmapped into an address
|
|
* space
|
|
*
|
|
* @listener: an object containing the callbacks to be called
|
|
* @filter: if non-%NULL, only regions in this address space will be observed
|
|
*/
|
|
void memory_listener_register(MemoryListener *listener, AddressSpace *filter);
|
|
|
|
/**
|
|
* memory_listener_unregister: undo the effect of memory_listener_register()
|
|
*
|
|
* @listener: an object containing the callbacks to be removed
|
|
*/
|
|
void memory_listener_unregister(MemoryListener *listener);
|
|
|
|
/**
|
|
* memory_global_dirty_log_start: begin dirty logging for all regions
|
|
*/
|
|
void memory_global_dirty_log_start(void);
|
|
|
|
/**
|
|
* memory_global_dirty_log_stop: end dirty logging for all regions
|
|
*/
|
|
void memory_global_dirty_log_stop(void);
|
|
|
|
void mtree_info(bool flatview, bool dispatch_tree, bool owner, bool disabled);
|
|
|
|
/**
|
|
* memory_region_dispatch_read: perform a read directly to the specified
|
|
* MemoryRegion.
|
|
*
|
|
* @mr: #MemoryRegion to access
|
|
* @addr: address within that region
|
|
* @pval: pointer to uint64_t which the data is written to
|
|
* @op: size, sign, and endianness of the memory operation
|
|
* @attrs: memory transaction attributes to use for the access
|
|
*/
|
|
MemTxResult memory_region_dispatch_read(MemoryRegion *mr,
|
|
hwaddr addr,
|
|
uint64_t *pval,
|
|
MemOp op,
|
|
MemTxAttrs attrs);
|
|
/**
|
|
* memory_region_dispatch_write: perform a write directly to the specified
|
|
* MemoryRegion.
|
|
*
|
|
* @mr: #MemoryRegion to access
|
|
* @addr: address within that region
|
|
* @data: data to write
|
|
* @op: size, sign, and endianness of the memory operation
|
|
* @attrs: memory transaction attributes to use for the access
|
|
*/
|
|
MemTxResult memory_region_dispatch_write(MemoryRegion *mr,
|
|
hwaddr addr,
|
|
uint64_t data,
|
|
MemOp op,
|
|
MemTxAttrs attrs);
|
|
|
|
/**
|
|
* address_space_init: initializes an address space
|
|
*
|
|
* @as: an uninitialized #AddressSpace
|
|
* @root: a #MemoryRegion that routes addresses for the address space
|
|
* @name: an address space name. The name is only used for debugging
|
|
* output.
|
|
*/
|
|
void address_space_init(AddressSpace *as, MemoryRegion *root, const char *name);
|
|
|
|
/**
|
|
* address_space_destroy: destroy an address space
|
|
*
|
|
* Releases all resources associated with an address space. After an address space
|
|
* is destroyed, its root memory region (given by address_space_init()) may be destroyed
|
|
* as well.
|
|
*
|
|
* @as: address space to be destroyed
|
|
*/
|
|
void address_space_destroy(AddressSpace *as);
|
|
|
|
/**
|
|
* address_space_remove_listeners: unregister all listeners of an address space
|
|
*
|
|
* Removes all callbacks previously registered with memory_listener_register()
|
|
* for @as.
|
|
*
|
|
* @as: an initialized #AddressSpace
|
|
*/
|
|
void address_space_remove_listeners(AddressSpace *as);
|
|
|
|
/**
|
|
* address_space_rw: read from or write to an address space.
|
|
*
|
|
* Return a MemTxResult indicating whether the operation succeeded
|
|
* or failed (eg unassigned memory, device rejected the transaction,
|
|
* IOMMU fault).
|
|
*
|
|
* @as: #AddressSpace to be accessed
|
|
* @addr: address within that address space
|
|
* @attrs: memory transaction attributes
|
|
* @buf: buffer with the data transferred
|
|
* @len: the number of bytes to read or write
|
|
* @is_write: indicates the transfer direction
|
|
*/
|
|
MemTxResult address_space_rw(AddressSpace *as, hwaddr addr,
|
|
MemTxAttrs attrs, void *buf,
|
|
hwaddr len, bool is_write);
|
|
|
|
/**
|
|
* address_space_write: write to address space.
|
|
*
|
|
* Return a MemTxResult indicating whether the operation succeeded
|
|
* or failed (eg unassigned memory, device rejected the transaction,
|
|
* IOMMU fault).
|
|
*
|
|
* @as: #AddressSpace to be accessed
|
|
* @addr: address within that address space
|
|
* @attrs: memory transaction attributes
|
|
* @buf: buffer with the data transferred
|
|
* @len: the number of bytes to write
|
|
*/
|
|
MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
|
|
MemTxAttrs attrs,
|
|
const void *buf, hwaddr len);
|
|
|
|
/**
|
|
* address_space_write_rom: write to address space, including ROM.
|
|
*
|
|
* This function writes to the specified address space, but will
|
|
* write data to both ROM and RAM. This is used for non-guest
|
|
* writes like writes from the gdb debug stub or initial loading
|
|
* of ROM contents.
|
|
*
|
|
* Note that portions of the write which attempt to write data to
|
|
* a device will be silently ignored -- only real RAM and ROM will
|
|
* be written to.
|
|
*
|
|
* Return a MemTxResult indicating whether the operation succeeded
|
|
* or failed (eg unassigned memory, device rejected the transaction,
|
|
* IOMMU fault).
|
|
*
|
|
* @as: #AddressSpace to be accessed
|
|
* @addr: address within that address space
|
|
* @attrs: memory transaction attributes
|
|
* @buf: buffer with the data transferred
|
|
* @len: the number of bytes to write
|
|
*/
|
|
MemTxResult address_space_write_rom(AddressSpace *as, hwaddr addr,
|
|
MemTxAttrs attrs,
|
|
const void *buf, hwaddr len);
|
|
|
|
/* address_space_ld*: load from an address space
|
|
* address_space_st*: store to an address space
|
|
*
|
|
* These functions perform a load or store of the byte, word,
|
|
* longword or quad to the specified address within the AddressSpace.
|
|
* The _le suffixed functions treat the data as little endian;
|
|
* _be indicates big endian; no suffix indicates "same endianness
|
|
* as guest CPU".
|
|
*
|
|
* The "guest CPU endianness" accessors are deprecated for use outside
|
|
* target-* code; devices should be CPU-agnostic and use either the LE
|
|
* or the BE accessors.
|
|
*
|
|
* @as #AddressSpace to be accessed
|
|
* @addr: address within that address space
|
|
* @val: data value, for stores
|
|
* @attrs: memory transaction attributes
|
|
* @result: location to write the success/failure of the transaction;
|
|
* if NULL, this information is discarded
|
|
*/
|
|
|
|
#define SUFFIX
|
|
#define ARG1 as
|
|
#define ARG1_DECL AddressSpace *as
|
|
#include "exec/memory_ldst.inc.h"
|
|
|
|
#define SUFFIX
|
|
#define ARG1 as
|
|
#define ARG1_DECL AddressSpace *as
|
|
#include "exec/memory_ldst_phys.inc.h"
|
|
|
|
struct MemoryRegionCache {
|
|
void *ptr;
|
|
hwaddr xlat;
|
|
hwaddr len;
|
|
FlatView *fv;
|
|
MemoryRegionSection mrs;
|
|
bool is_write;
|
|
};
|
|
|
|
#define MEMORY_REGION_CACHE_INVALID ((MemoryRegionCache) { .mrs.mr = NULL })
|
|
|
|
|
|
/* address_space_ld*_cached: load from a cached #MemoryRegion
|
|
* address_space_st*_cached: store into a cached #MemoryRegion
|
|
*
|
|
* These functions perform a load or store of the byte, word,
|
|
* longword or quad to the specified address. The address is
|
|
* a physical address in the AddressSpace, but it must lie within
|
|
* a #MemoryRegion that was mapped with address_space_cache_init.
|
|
*
|
|
* The _le suffixed functions treat the data as little endian;
|
|
* _be indicates big endian; no suffix indicates "same endianness
|
|
* as guest CPU".
|
|
*
|
|
* The "guest CPU endianness" accessors are deprecated for use outside
|
|
* target-* code; devices should be CPU-agnostic and use either the LE
|
|
* or the BE accessors.
|
|
*
|
|
* @cache: previously initialized #MemoryRegionCache to be accessed
|
|
* @addr: address within the address space
|
|
* @val: data value, for stores
|
|
* @attrs: memory transaction attributes
|
|
* @result: location to write the success/failure of the transaction;
|
|
* if NULL, this information is discarded
|
|
*/
|
|
|
|
#define SUFFIX _cached_slow
|
|
#define ARG1 cache
|
|
#define ARG1_DECL MemoryRegionCache *cache
|
|
#include "exec/memory_ldst.inc.h"
|
|
|
|
/* Inline fast path for direct RAM access. */
|
|
static inline uint8_t address_space_ldub_cached(MemoryRegionCache *cache,
|
|
hwaddr addr, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
assert(addr < cache->len);
|
|
if (likely(cache->ptr)) {
|
|
return ldub_p(cache->ptr + addr);
|
|
} else {
|
|
return address_space_ldub_cached_slow(cache, addr, attrs, result);
|
|
}
|
|
}
|
|
|
|
static inline void address_space_stb_cached(MemoryRegionCache *cache,
|
|
hwaddr addr, uint32_t val, MemTxAttrs attrs, MemTxResult *result)
|
|
{
|
|
assert(addr < cache->len);
|
|
if (likely(cache->ptr)) {
|
|
stb_p(cache->ptr + addr, val);
|
|
} else {
|
|
address_space_stb_cached_slow(cache, addr, val, attrs, result);
|
|
}
|
|
}
|
|
|
|
#define ENDIANNESS _le
|
|
#include "exec/memory_ldst_cached.inc.h"
|
|
|
|
#define ENDIANNESS _be
|
|
#include "exec/memory_ldst_cached.inc.h"
|
|
|
|
#define SUFFIX _cached
|
|
#define ARG1 cache
|
|
#define ARG1_DECL MemoryRegionCache *cache
|
|
#include "exec/memory_ldst_phys.inc.h"
|
|
|
|
/* address_space_cache_init: prepare for repeated access to a physical
|
|
* memory region
|
|
*
|
|
* @cache: #MemoryRegionCache to be filled
|
|
* @as: #AddressSpace to be accessed
|
|
* @addr: address within that address space
|
|
* @len: length of buffer
|
|
* @is_write: indicates the transfer direction
|
|
*
|
|
* Will only work with RAM, and may map a subset of the requested range by
|
|
* returning a value that is less than @len. On failure, return a negative
|
|
* errno value.
|
|
*
|
|
* Because it only works with RAM, this function can be used for
|
|
* read-modify-write operations. In this case, is_write should be %true.
|
|
*
|
|
* Note that addresses passed to the address_space_*_cached functions
|
|
* are relative to @addr.
|
|
*/
|
|
int64_t address_space_cache_init(MemoryRegionCache *cache,
|
|
AddressSpace *as,
|
|
hwaddr addr,
|
|
hwaddr len,
|
|
bool is_write);
|
|
|
|
/**
|
|
* address_space_cache_invalidate: complete a write to a #MemoryRegionCache
|
|
*
|
|
* @cache: The #MemoryRegionCache to operate on.
|
|
* @addr: The first physical address that was written, relative to the
|
|
* address that was passed to @address_space_cache_init.
|
|
* @access_len: The number of bytes that were written starting at @addr.
|
|
*/
|
|
void address_space_cache_invalidate(MemoryRegionCache *cache,
|
|
hwaddr addr,
|
|
hwaddr access_len);
|
|
|
|
/**
|
|
* address_space_cache_destroy: free a #MemoryRegionCache
|
|
*
|
|
* @cache: The #MemoryRegionCache whose memory should be released.
|
|
*/
|
|
void address_space_cache_destroy(MemoryRegionCache *cache);
|
|
|
|
/* address_space_get_iotlb_entry: translate an address into an IOTLB
|
|
* entry. Should be called from an RCU critical section.
|
|
*/
|
|
IOMMUTLBEntry address_space_get_iotlb_entry(AddressSpace *as, hwaddr addr,
|
|
bool is_write, MemTxAttrs attrs);
|
|
|
|
/* address_space_translate: translate an address range into an address space
|
|
* into a MemoryRegion and an address range into that section. Should be
|
|
* called from an RCU critical section, to avoid that the last reference
|
|
* to the returned region disappears after address_space_translate returns.
|
|
*
|
|
* @fv: #FlatView to be accessed
|
|
* @addr: address within that address space
|
|
* @xlat: pointer to address within the returned memory region section's
|
|
* #MemoryRegion.
|
|
* @len: pointer to length
|
|
* @is_write: indicates the transfer direction
|
|
* @attrs: memory attributes
|
|
*/
|
|
MemoryRegion *flatview_translate(FlatView *fv,
|
|
hwaddr addr, hwaddr *xlat,
|
|
hwaddr *len, bool is_write,
|
|
MemTxAttrs attrs);
|
|
|
|
static inline MemoryRegion *address_space_translate(AddressSpace *as,
|
|
hwaddr addr, hwaddr *xlat,
|
|
hwaddr *len, bool is_write,
|
|
MemTxAttrs attrs)
|
|
{
|
|
return flatview_translate(address_space_to_flatview(as),
|
|
addr, xlat, len, is_write, attrs);
|
|
}
|
|
|
|
/* address_space_access_valid: check for validity of accessing an address
|
|
* space range
|
|
*
|
|
* Check whether memory is assigned to the given address space range, and
|
|
* access is permitted by any IOMMU regions that are active for the address
|
|
* space.
|
|
*
|
|
* For now, addr and len should be aligned to a page size. This limitation
|
|
* will be lifted in the future.
|
|
*
|
|
* @as: #AddressSpace to be accessed
|
|
* @addr: address within that address space
|
|
* @len: length of the area to be checked
|
|
* @is_write: indicates the transfer direction
|
|
* @attrs: memory attributes
|
|
*/
|
|
bool address_space_access_valid(AddressSpace *as, hwaddr addr, hwaddr len,
|
|
bool is_write, MemTxAttrs attrs);
|
|
|
|
/* address_space_map: map a physical memory region into a host virtual address
|
|
*
|
|
* May map a subset of the requested range, given by and returned in @plen.
|
|
* May return %NULL and set *@plen to zero(0), if resources needed to perform
|
|
* the mapping are exhausted.
|
|
* Use only for reads OR writes - not for read-modify-write operations.
|
|
* Use cpu_register_map_client() to know when retrying the map operation is
|
|
* likely to succeed.
|
|
*
|
|
* @as: #AddressSpace to be accessed
|
|
* @addr: address within that address space
|
|
* @plen: pointer to length of buffer; updated on return
|
|
* @is_write: indicates the transfer direction
|
|
* @attrs: memory attributes
|
|
*/
|
|
void *address_space_map(AddressSpace *as, hwaddr addr,
|
|
hwaddr *plen, bool is_write, MemTxAttrs attrs);
|
|
|
|
/* address_space_unmap: Unmaps a memory region previously mapped by address_space_map()
|
|
*
|
|
* Will also mark the memory as dirty if @is_write == %true. @access_len gives
|
|
* the amount of memory that was actually read or written by the caller.
|
|
*
|
|
* @as: #AddressSpace used
|
|
* @buffer: host pointer as returned by address_space_map()
|
|
* @len: buffer length as returned by address_space_map()
|
|
* @access_len: amount of data actually transferred
|
|
* @is_write: indicates the transfer direction
|
|
*/
|
|
void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
|
|
bool is_write, hwaddr access_len);
|
|
|
|
|
|
/* Internal functions, part of the implementation of address_space_read. */
|
|
MemTxResult address_space_read_full(AddressSpace *as, hwaddr addr,
|
|
MemTxAttrs attrs, void *buf, hwaddr len);
|
|
MemTxResult flatview_read_continue(FlatView *fv, hwaddr addr,
|
|
MemTxAttrs attrs, void *buf,
|
|
hwaddr len, hwaddr addr1, hwaddr l,
|
|
MemoryRegion *mr);
|
|
void *qemu_map_ram_ptr(RAMBlock *ram_block, ram_addr_t addr);
|
|
|
|
/* Internal functions, part of the implementation of address_space_read_cached
|
|
* and address_space_write_cached. */
|
|
MemTxResult address_space_read_cached_slow(MemoryRegionCache *cache,
|
|
hwaddr addr, void *buf, hwaddr len);
|
|
MemTxResult address_space_write_cached_slow(MemoryRegionCache *cache,
|
|
hwaddr addr, const void *buf,
|
|
hwaddr len);
|
|
|
|
static inline bool memory_access_is_direct(MemoryRegion *mr, bool is_write)
|
|
{
|
|
if (is_write) {
|
|
return memory_region_is_ram(mr) && !mr->readonly &&
|
|
!mr->rom_device && !memory_region_is_ram_device(mr);
|
|
} else {
|
|
return (memory_region_is_ram(mr) && !memory_region_is_ram_device(mr)) ||
|
|
memory_region_is_romd(mr);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* address_space_read: read from an address space.
|
|
*
|
|
* Return a MemTxResult indicating whether the operation succeeded
|
|
* or failed (eg unassigned memory, device rejected the transaction,
|
|
* IOMMU fault). Called within RCU critical section.
|
|
*
|
|
* @as: #AddressSpace to be accessed
|
|
* @addr: address within that address space
|
|
* @attrs: memory transaction attributes
|
|
* @buf: buffer with the data transferred
|
|
* @len: length of the data transferred
|
|
*/
|
|
static inline __attribute__((__always_inline__))
|
|
MemTxResult address_space_read(AddressSpace *as, hwaddr addr,
|
|
MemTxAttrs attrs, void *buf,
|
|
hwaddr len)
|
|
{
|
|
MemTxResult result = MEMTX_OK;
|
|
hwaddr l, addr1;
|
|
void *ptr;
|
|
MemoryRegion *mr;
|
|
FlatView *fv;
|
|
|
|
if (__builtin_constant_p(len)) {
|
|
if (len) {
|
|
RCU_READ_LOCK_GUARD();
|
|
fv = address_space_to_flatview(as);
|
|
l = len;
|
|
mr = flatview_translate(fv, addr, &addr1, &l, false, attrs);
|
|
if (len == l && memory_access_is_direct(mr, false)) {
|
|
ptr = qemu_map_ram_ptr(mr->ram_block, addr1);
|
|
memcpy(buf, ptr, len);
|
|
} else {
|
|
result = flatview_read_continue(fv, addr, attrs, buf, len,
|
|
addr1, l, mr);
|
|
}
|
|
}
|
|
} else {
|
|
result = address_space_read_full(as, addr, attrs, buf, len);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* address_space_read_cached: read from a cached RAM region
|
|
*
|
|
* @cache: Cached region to be addressed
|
|
* @addr: address relative to the base of the RAM region
|
|
* @buf: buffer with the data transferred
|
|
* @len: length of the data transferred
|
|
*/
|
|
static inline MemTxResult
|
|
address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
|
|
void *buf, hwaddr len)
|
|
{
|
|
assert(addr < cache->len && len <= cache->len - addr);
|
|
if (likely(cache->ptr)) {
|
|
memcpy(buf, cache->ptr + addr, len);
|
|
return MEMTX_OK;
|
|
} else {
|
|
return address_space_read_cached_slow(cache, addr, buf, len);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* address_space_write_cached: write to a cached RAM region
|
|
*
|
|
* @cache: Cached region to be addressed
|
|
* @addr: address relative to the base of the RAM region
|
|
* @buf: buffer with the data transferred
|
|
* @len: length of the data transferred
|
|
*/
|
|
static inline MemTxResult
|
|
address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
|
|
const void *buf, hwaddr len)
|
|
{
|
|
assert(addr < cache->len && len <= cache->len - addr);
|
|
if (likely(cache->ptr)) {
|
|
memcpy(cache->ptr + addr, buf, len);
|
|
return MEMTX_OK;
|
|
} else {
|
|
return address_space_write_cached_slow(cache, addr, buf, len);
|
|
}
|
|
}
|
|
|
|
#ifdef NEED_CPU_H
|
|
/* enum device_endian to MemOp. */
|
|
static inline MemOp devend_memop(enum device_endian end)
|
|
{
|
|
QEMU_BUILD_BUG_ON(DEVICE_HOST_ENDIAN != DEVICE_LITTLE_ENDIAN &&
|
|
DEVICE_HOST_ENDIAN != DEVICE_BIG_ENDIAN);
|
|
|
|
#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
|
|
/* Swap if non-host endianness or native (target) endianness */
|
|
return (end == DEVICE_HOST_ENDIAN) ? 0 : MO_BSWAP;
|
|
#else
|
|
const int non_host_endianness =
|
|
DEVICE_LITTLE_ENDIAN ^ DEVICE_BIG_ENDIAN ^ DEVICE_HOST_ENDIAN;
|
|
|
|
/* In this case, native (target) endianness needs no swap. */
|
|
return (end == non_host_endianness) ? MO_BSWAP : 0;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Inhibit technologies that require discarding of pages in RAM blocks, e.g.,
|
|
* to manage the actual amount of memory consumed by the VM (then, the memory
|
|
* provided by RAM blocks might be bigger than the desired memory consumption).
|
|
* This *must* be set if:
|
|
* - Discarding parts of a RAM blocks does not result in the change being
|
|
* reflected in the VM and the pages getting freed.
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|
* - All memory in RAM blocks is pinned or duplicated, invaldiating any previous
|
|
* discards blindly.
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|
* - Discarding parts of a RAM blocks will result in integrity issues (e.g.,
|
|
* encrypted VMs).
|
|
* Technologies that only temporarily pin the current working set of a
|
|
* driver are fine, because we don't expect such pages to be discarded
|
|
* (esp. based on guest action like balloon inflation).
|
|
*
|
|
* This is *not* to be used to protect from concurrent discards (esp.,
|
|
* postcopy).
|
|
*
|
|
* Returns 0 if successful. Returns -EBUSY if a technology that relies on
|
|
* discards to work reliably is active.
|
|
*/
|
|
int ram_block_discard_disable(bool state);
|
|
|
|
/*
|
|
* Inhibit technologies that disable discarding of pages in RAM blocks.
|
|
*
|
|
* Returns 0 if successful. Returns -EBUSY if discards are already set to
|
|
* broken.
|
|
*/
|
|
int ram_block_discard_require(bool state);
|
|
|
|
/*
|
|
* Test if discarding of memory in ram blocks is disabled.
|
|
*/
|
|
bool ram_block_discard_is_disabled(void);
|
|
|
|
/*
|
|
* Test if discarding of memory in ram blocks is required to work reliably.
|
|
*/
|
|
bool ram_block_discard_is_required(void);
|
|
|
|
#endif
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|
|
#endif
|