321 lines
11 KiB
C
321 lines
11 KiB
C
/*
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* HAX memory mapping operations
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*
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* Copyright (c) 2015-16 Intel Corporation
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* Copyright 2016 Google, Inc.
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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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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/address-spaces.h"
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#include "qemu/error-report.h"
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#include "target/i386/hax-i386.h"
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#include "qemu/queue.h"
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#define DEBUG_HAX_MEM 0
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#define DPRINTF(fmt, ...) \
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do { \
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if (DEBUG_HAX_MEM) { \
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fprintf(stdout, fmt, ## __VA_ARGS__); \
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} \
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} while (0)
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/**
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* HAXMapping: describes a pending guest physical memory mapping
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*
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* @start_pa: a guest physical address marking the start of the region; must be
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* page-aligned
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* @size: a guest physical address marking the end of the region; must be
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* page-aligned
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* @host_va: the host virtual address of the start of the mapping
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* @flags: mapping parameters e.g. HAX_RAM_INFO_ROM or HAX_RAM_INFO_INVALID
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* @entry: additional fields for linking #HAXMapping instances together
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*/
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typedef struct HAXMapping {
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uint64_t start_pa;
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uint32_t size;
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uint64_t host_va;
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int flags;
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QTAILQ_ENTRY(HAXMapping) entry;
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} HAXMapping;
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/*
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* A doubly-linked list (actually a tail queue) of the pending page mappings
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* for the ongoing memory transaction.
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*
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* It is used to optimize the number of page mapping updates done through the
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* kernel module. For example, it's effective when a driver is digging an MMIO
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* hole inside an existing memory mapping. It will get a deletion of the whole
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* region, then the addition of the 2 remaining RAM areas around the hole and
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* finally the memory transaction commit. During the commit, it will effectively
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* send to the kernel only the removal of the pages from the MMIO hole after
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* having computed locally the result of the deletion and additions.
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*/
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static QTAILQ_HEAD(, HAXMapping) mappings =
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QTAILQ_HEAD_INITIALIZER(mappings);
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/**
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* hax_mapping_dump_list: dumps @mappings to stdout (for debugging)
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*/
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static void hax_mapping_dump_list(void)
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{
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HAXMapping *entry;
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DPRINTF("%s updates:\n", __func__);
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QTAILQ_FOREACH(entry, &mappings, entry) {
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DPRINTF("\t%c 0x%016" PRIx64 "->0x%016" PRIx64 " VA 0x%016" PRIx64
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"%s\n", entry->flags & HAX_RAM_INFO_INVALID ? '-' : '+',
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entry->start_pa, entry->start_pa + entry->size, entry->host_va,
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entry->flags & HAX_RAM_INFO_ROM ? " ROM" : "");
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}
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}
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static void hax_insert_mapping_before(HAXMapping *next, uint64_t start_pa,
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uint32_t size, uint64_t host_va,
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uint8_t flags)
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{
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HAXMapping *entry;
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entry = g_malloc0(sizeof(*entry));
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entry->start_pa = start_pa;
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entry->size = size;
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entry->host_va = host_va;
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entry->flags = flags;
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if (!next) {
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QTAILQ_INSERT_TAIL(&mappings, entry, entry);
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} else {
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QTAILQ_INSERT_BEFORE(next, entry, entry);
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}
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}
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static bool hax_mapping_is_opposite(HAXMapping *entry, uint64_t host_va,
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uint8_t flags)
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{
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/* removed then added without change for the read-only flag */
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bool nop_flags = (entry->flags ^ flags) == HAX_RAM_INFO_INVALID;
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return (entry->host_va == host_va) && nop_flags;
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}
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static void hax_update_mapping(uint64_t start_pa, uint32_t size,
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uint64_t host_va, uint8_t flags)
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{
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uint64_t end_pa = start_pa + size;
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HAXMapping *entry, *next;
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QTAILQ_FOREACH_SAFE(entry, &mappings, entry, next) {
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uint32_t chunk_sz;
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if (start_pa >= entry->start_pa + entry->size) {
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continue;
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}
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if (start_pa < entry->start_pa) {
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chunk_sz = end_pa <= entry->start_pa ? size
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: entry->start_pa - start_pa;
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hax_insert_mapping_before(entry, start_pa, chunk_sz,
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host_va, flags);
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start_pa += chunk_sz;
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host_va += chunk_sz;
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size -= chunk_sz;
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} else if (start_pa > entry->start_pa) {
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/* split the existing chunk at start_pa */
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chunk_sz = start_pa - entry->start_pa;
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hax_insert_mapping_before(entry, entry->start_pa, chunk_sz,
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entry->host_va, entry->flags);
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entry->start_pa += chunk_sz;
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entry->host_va += chunk_sz;
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entry->size -= chunk_sz;
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}
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/* now start_pa == entry->start_pa */
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chunk_sz = MIN(size, entry->size);
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if (chunk_sz) {
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bool nop = hax_mapping_is_opposite(entry, host_va, flags);
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bool partial = chunk_sz < entry->size;
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if (partial) {
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/* remove the beginning of the existing chunk */
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entry->start_pa += chunk_sz;
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entry->host_va += chunk_sz;
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entry->size -= chunk_sz;
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if (!nop) {
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hax_insert_mapping_before(entry, start_pa, chunk_sz,
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host_va, flags);
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}
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} else { /* affects the full mapping entry */
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if (nop) { /* no change to this mapping, remove it */
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QTAILQ_REMOVE(&mappings, entry, entry);
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g_free(entry);
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} else { /* update mapping properties */
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entry->host_va = host_va;
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entry->flags = flags;
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}
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}
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start_pa += chunk_sz;
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host_va += chunk_sz;
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size -= chunk_sz;
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}
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if (!size) { /* we are done */
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break;
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}
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}
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if (size) { /* add the leftover */
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hax_insert_mapping_before(NULL, start_pa, size, host_va, flags);
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}
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}
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static void hax_process_section(MemoryRegionSection *section, uint8_t flags)
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{
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MemoryRegion *mr = section->mr;
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hwaddr start_pa = section->offset_within_address_space;
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ram_addr_t size = int128_get64(section->size);
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unsigned int delta;
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uint64_t host_va;
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uint32_t max_mapping_size;
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/* We only care about RAM and ROM regions */
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if (!memory_region_is_ram(mr)) {
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if (memory_region_is_romd(mr)) {
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/* HAXM kernel module does not support ROMD yet */
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warn_report("Ignoring ROMD region 0x%016" PRIx64 "->0x%016" PRIx64,
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start_pa, start_pa + size);
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}
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return;
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}
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/* Adjust start_pa and size so that they are page-aligned. (Cf
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* kvm_set_phys_mem() in kvm-all.c).
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*/
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delta = qemu_real_host_page_size - (start_pa & ~qemu_real_host_page_mask);
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delta &= ~qemu_real_host_page_mask;
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if (delta > size) {
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return;
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}
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start_pa += delta;
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size -= delta;
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size &= qemu_real_host_page_mask;
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if (!size || (start_pa & ~qemu_real_host_page_mask)) {
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return;
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}
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host_va = (uintptr_t)memory_region_get_ram_ptr(mr)
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+ section->offset_within_region + delta;
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if (memory_region_is_rom(section->mr)) {
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flags |= HAX_RAM_INFO_ROM;
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}
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/*
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* The kernel module interface uses 32-bit sizes:
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* https://github.com/intel/haxm/blob/master/API.md#hax_vm_ioctl_set_ram
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*
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* If the mapping size is longer than 32 bits, we can't process it in one
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* call into the kernel. Instead, we split the mapping into smaller ones,
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* and call hax_update_mapping() on each.
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*/
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max_mapping_size = UINT32_MAX & qemu_real_host_page_mask;
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while (size > max_mapping_size) {
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hax_update_mapping(start_pa, max_mapping_size, host_va, flags);
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start_pa += max_mapping_size;
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size -= max_mapping_size;
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host_va += max_mapping_size;
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}
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/* Now size <= max_mapping_size */
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hax_update_mapping(start_pa, (uint32_t)size, host_va, flags);
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}
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static void hax_region_add(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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memory_region_ref(section->mr);
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hax_process_section(section, 0);
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}
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static void hax_region_del(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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hax_process_section(section, HAX_RAM_INFO_INVALID);
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memory_region_unref(section->mr);
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}
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static void hax_transaction_begin(MemoryListener *listener)
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{
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g_assert(QTAILQ_EMPTY(&mappings));
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}
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static void hax_transaction_commit(MemoryListener *listener)
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{
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if (!QTAILQ_EMPTY(&mappings)) {
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HAXMapping *entry, *next;
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if (DEBUG_HAX_MEM) {
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hax_mapping_dump_list();
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}
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QTAILQ_FOREACH_SAFE(entry, &mappings, entry, next) {
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if (entry->flags & HAX_RAM_INFO_INVALID) {
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/* for unmapping, put the values expected by the kernel */
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entry->flags = HAX_RAM_INFO_INVALID;
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entry->host_va = 0;
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}
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if (hax_set_ram(entry->start_pa, entry->size,
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entry->host_va, entry->flags)) {
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fprintf(stderr, "%s: Failed mapping @0x%016" PRIx64 "+0x%"
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PRIx32 " flags %02x\n", __func__, entry->start_pa,
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entry->size, entry->flags);
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}
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QTAILQ_REMOVE(&mappings, entry, entry);
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g_free(entry);
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}
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}
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}
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/* currently we fake the dirty bitmap sync, always dirty */
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static void hax_log_sync(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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MemoryRegion *mr = section->mr;
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if (!memory_region_is_ram(mr)) {
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/* Skip MMIO regions */
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return;
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}
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memory_region_set_dirty(mr, 0, int128_get64(section->size));
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}
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static MemoryListener hax_memory_listener = {
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.begin = hax_transaction_begin,
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.commit = hax_transaction_commit,
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.region_add = hax_region_add,
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.region_del = hax_region_del,
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.log_sync = hax_log_sync,
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.priority = 10,
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};
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static void hax_ram_block_added(RAMBlockNotifier *n, void *host, size_t size)
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{
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/*
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* We must register each RAM block with the HAXM kernel module, or
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* hax_set_ram() will fail for any mapping into the RAM block:
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* https://github.com/intel/haxm/blob/master/API.md#hax_vm_ioctl_alloc_ram
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*
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* Old versions of the HAXM kernel module (< 6.2.0) used to preallocate all
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* host physical pages for the RAM block as part of this registration
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* process, hence the name hax_populate_ram().
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*/
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if (hax_populate_ram((uint64_t)(uintptr_t)host, size) < 0) {
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fprintf(stderr, "HAX failed to populate RAM\n");
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abort();
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}
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}
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static struct RAMBlockNotifier hax_ram_notifier = {
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.ram_block_added = hax_ram_block_added,
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};
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void hax_memory_init(void)
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{
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ram_block_notifier_add(&hax_ram_notifier);
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memory_listener_register(&hax_memory_listener, &address_space_memory);
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}
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