580 lines
17 KiB
C
580 lines
17 KiB
C
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/*
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* Copyright (C) 2011 Citrix Ltd.
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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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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include "qemu/units.h"
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#include "qemu/error-report.h"
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#include <sys/resource.h>
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#include "hw/xen/xen-legacy-backend.h"
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#include "qemu/bitmap.h"
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#include "sysemu/runstate.h"
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#include "sysemu/xen-mapcache.h"
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#include "trace.h"
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//#define MAPCACHE_DEBUG
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#ifdef MAPCACHE_DEBUG
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# define DPRINTF(fmt, ...) do { \
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fprintf(stderr, "xen_mapcache: " fmt, ## __VA_ARGS__); \
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} while (0)
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#else
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# define DPRINTF(fmt, ...) do { } while (0)
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#endif
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#if HOST_LONG_BITS == 32
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# define MCACHE_BUCKET_SHIFT 16
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# define MCACHE_MAX_SIZE (1UL<<31) /* 2GB Cap */
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#else
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# define MCACHE_BUCKET_SHIFT 20
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# define MCACHE_MAX_SIZE (1UL<<35) /* 32GB Cap */
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#endif
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#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT)
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/* This is the size of the virtual address space reserve to QEMU that will not
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* be use by MapCache.
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* From empirical tests I observed that qemu use 75MB more than the
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* max_mcache_size.
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*/
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#define NON_MCACHE_MEMORY_SIZE (80 * MiB)
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typedef struct MapCacheEntry {
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hwaddr paddr_index;
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uint8_t *vaddr_base;
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unsigned long *valid_mapping;
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uint8_t lock;
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#define XEN_MAPCACHE_ENTRY_DUMMY (1 << 0)
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uint8_t flags;
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hwaddr size;
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struct MapCacheEntry *next;
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} MapCacheEntry;
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typedef struct MapCacheRev {
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uint8_t *vaddr_req;
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hwaddr paddr_index;
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hwaddr size;
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QTAILQ_ENTRY(MapCacheRev) next;
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bool dma;
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} MapCacheRev;
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typedef struct MapCache {
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MapCacheEntry *entry;
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unsigned long nr_buckets;
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QTAILQ_HEAD(, MapCacheRev) locked_entries;
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/* For most cases (>99.9%), the page address is the same. */
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MapCacheEntry *last_entry;
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unsigned long max_mcache_size;
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unsigned int mcache_bucket_shift;
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phys_offset_to_gaddr_t phys_offset_to_gaddr;
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QemuMutex lock;
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void *opaque;
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} MapCache;
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static MapCache *mapcache;
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static inline void mapcache_lock(void)
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{
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qemu_mutex_lock(&mapcache->lock);
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}
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static inline void mapcache_unlock(void)
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{
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qemu_mutex_unlock(&mapcache->lock);
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}
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static inline int test_bits(int nr, int size, const unsigned long *addr)
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{
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unsigned long res = find_next_zero_bit(addr, size + nr, nr);
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if (res >= nr + size)
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return 1;
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else
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return 0;
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}
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void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
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{
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unsigned long size;
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struct rlimit rlimit_as;
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mapcache = g_malloc0(sizeof (MapCache));
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mapcache->phys_offset_to_gaddr = f;
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mapcache->opaque = opaque;
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qemu_mutex_init(&mapcache->lock);
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QTAILQ_INIT(&mapcache->locked_entries);
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if (geteuid() == 0) {
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rlimit_as.rlim_cur = RLIM_INFINITY;
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rlimit_as.rlim_max = RLIM_INFINITY;
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mapcache->max_mcache_size = MCACHE_MAX_SIZE;
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} else {
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getrlimit(RLIMIT_AS, &rlimit_as);
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rlimit_as.rlim_cur = rlimit_as.rlim_max;
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if (rlimit_as.rlim_max != RLIM_INFINITY) {
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warn_report("QEMU's maximum size of virtual"
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" memory is not infinity");
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}
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if (rlimit_as.rlim_max < MCACHE_MAX_SIZE + NON_MCACHE_MEMORY_SIZE) {
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mapcache->max_mcache_size = rlimit_as.rlim_max -
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NON_MCACHE_MEMORY_SIZE;
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} else {
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mapcache->max_mcache_size = MCACHE_MAX_SIZE;
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}
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}
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setrlimit(RLIMIT_AS, &rlimit_as);
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mapcache->nr_buckets =
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(((mapcache->max_mcache_size >> XC_PAGE_SHIFT) +
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(1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >>
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(MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT));
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size = mapcache->nr_buckets * sizeof (MapCacheEntry);
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size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
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DPRINTF("%s, nr_buckets = %lx size %lu\n", __func__,
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mapcache->nr_buckets, size);
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mapcache->entry = g_malloc0(size);
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}
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static void xen_remap_bucket(MapCacheEntry *entry,
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void *vaddr,
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hwaddr size,
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hwaddr address_index,
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bool dummy)
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{
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uint8_t *vaddr_base;
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xen_pfn_t *pfns;
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int *err;
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unsigned int i;
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hwaddr nb_pfn = size >> XC_PAGE_SHIFT;
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trace_xen_remap_bucket(address_index);
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pfns = g_malloc0(nb_pfn * sizeof (xen_pfn_t));
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err = g_malloc0(nb_pfn * sizeof (int));
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if (entry->vaddr_base != NULL) {
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if (!(entry->flags & XEN_MAPCACHE_ENTRY_DUMMY)) {
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ram_block_notify_remove(entry->vaddr_base, entry->size);
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}
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if (munmap(entry->vaddr_base, entry->size) != 0) {
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perror("unmap fails");
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exit(-1);
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}
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}
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g_free(entry->valid_mapping);
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entry->valid_mapping = NULL;
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for (i = 0; i < nb_pfn; i++) {
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pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i;
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}
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/*
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* If the caller has requested the mapping at a specific address use
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* MAP_FIXED to make sure it's honored.
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*/
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if (!dummy) {
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vaddr_base = xenforeignmemory_map2(xen_fmem, xen_domid, vaddr,
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PROT_READ | PROT_WRITE,
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vaddr ? MAP_FIXED : 0,
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nb_pfn, pfns, err);
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if (vaddr_base == NULL) {
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perror("xenforeignmemory_map2");
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exit(-1);
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}
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} else {
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/*
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* We create dummy mappings where we are unable to create a foreign
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* mapping immediately due to certain circumstances (i.e. on resume now)
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*/
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vaddr_base = mmap(vaddr, size, PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_SHARED | (vaddr ? MAP_FIXED : 0),
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-1, 0);
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if (vaddr_base == MAP_FAILED) {
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perror("mmap");
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exit(-1);
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}
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}
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if (!(entry->flags & XEN_MAPCACHE_ENTRY_DUMMY)) {
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ram_block_notify_add(vaddr_base, size);
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}
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entry->vaddr_base = vaddr_base;
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entry->paddr_index = address_index;
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entry->size = size;
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entry->valid_mapping = (unsigned long *) g_malloc0(sizeof(unsigned long) *
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BITS_TO_LONGS(size >> XC_PAGE_SHIFT));
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if (dummy) {
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entry->flags |= XEN_MAPCACHE_ENTRY_DUMMY;
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} else {
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entry->flags &= ~(XEN_MAPCACHE_ENTRY_DUMMY);
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}
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bitmap_zero(entry->valid_mapping, nb_pfn);
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for (i = 0; i < nb_pfn; i++) {
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if (!err[i]) {
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bitmap_set(entry->valid_mapping, i, 1);
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}
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}
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g_free(pfns);
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g_free(err);
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}
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static uint8_t *xen_map_cache_unlocked(hwaddr phys_addr, hwaddr size,
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uint8_t lock, bool dma)
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{
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MapCacheEntry *entry, *pentry = NULL,
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*free_entry = NULL, *free_pentry = NULL;
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hwaddr address_index;
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hwaddr address_offset;
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hwaddr cache_size = size;
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hwaddr test_bit_size;
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bool translated G_GNUC_UNUSED = false;
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bool dummy = false;
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tryagain:
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address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
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address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
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trace_xen_map_cache(phys_addr);
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/* test_bit_size is always a multiple of XC_PAGE_SIZE */
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if (size) {
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test_bit_size = size + (phys_addr & (XC_PAGE_SIZE - 1));
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if (test_bit_size % XC_PAGE_SIZE) {
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test_bit_size += XC_PAGE_SIZE - (test_bit_size % XC_PAGE_SIZE);
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}
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} else {
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test_bit_size = XC_PAGE_SIZE;
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}
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if (mapcache->last_entry != NULL &&
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mapcache->last_entry->paddr_index == address_index &&
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!lock && !size &&
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test_bits(address_offset >> XC_PAGE_SHIFT,
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test_bit_size >> XC_PAGE_SHIFT,
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mapcache->last_entry->valid_mapping)) {
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trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
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return mapcache->last_entry->vaddr_base + address_offset;
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}
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/* size is always a multiple of MCACHE_BUCKET_SIZE */
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if (size) {
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cache_size = size + address_offset;
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if (cache_size % MCACHE_BUCKET_SIZE) {
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cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
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}
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} else {
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cache_size = MCACHE_BUCKET_SIZE;
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}
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entry = &mapcache->entry[address_index % mapcache->nr_buckets];
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while (entry && (lock || entry->lock) && entry->vaddr_base &&
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(entry->paddr_index != address_index || entry->size != cache_size ||
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!test_bits(address_offset >> XC_PAGE_SHIFT,
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test_bit_size >> XC_PAGE_SHIFT,
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entry->valid_mapping))) {
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if (!free_entry && !entry->lock) {
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free_entry = entry;
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free_pentry = pentry;
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}
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pentry = entry;
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entry = entry->next;
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}
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if (!entry && free_entry) {
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entry = free_entry;
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pentry = free_pentry;
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}
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if (!entry) {
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entry = g_malloc0(sizeof (MapCacheEntry));
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pentry->next = entry;
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xen_remap_bucket(entry, NULL, cache_size, address_index, dummy);
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} else if (!entry->lock) {
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if (!entry->vaddr_base || entry->paddr_index != address_index ||
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entry->size != cache_size ||
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!test_bits(address_offset >> XC_PAGE_SHIFT,
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test_bit_size >> XC_PAGE_SHIFT,
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entry->valid_mapping)) {
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xen_remap_bucket(entry, NULL, cache_size, address_index, dummy);
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}
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}
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if(!test_bits(address_offset >> XC_PAGE_SHIFT,
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test_bit_size >> XC_PAGE_SHIFT,
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entry->valid_mapping)) {
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mapcache->last_entry = NULL;
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#ifdef XEN_COMPAT_PHYSMAP
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if (!translated && mapcache->phys_offset_to_gaddr) {
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phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size);
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translated = true;
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goto tryagain;
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}
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#endif
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if (!dummy && runstate_check(RUN_STATE_INMIGRATE)) {
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dummy = true;
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goto tryagain;
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}
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trace_xen_map_cache_return(NULL);
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return NULL;
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}
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mapcache->last_entry = entry;
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if (lock) {
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MapCacheRev *reventry = g_malloc0(sizeof(MapCacheRev));
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entry->lock++;
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reventry->dma = dma;
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reventry->vaddr_req = mapcache->last_entry->vaddr_base + address_offset;
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reventry->paddr_index = mapcache->last_entry->paddr_index;
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reventry->size = entry->size;
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QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next);
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}
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trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
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return mapcache->last_entry->vaddr_base + address_offset;
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}
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uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size,
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uint8_t lock, bool dma)
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{
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uint8_t *p;
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mapcache_lock();
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p = xen_map_cache_unlocked(phys_addr, size, lock, dma);
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mapcache_unlock();
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return p;
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|
}
|
||
|
|
|
||
|
|
ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
|
||
|
|
{
|
||
|
|
MapCacheEntry *entry = NULL;
|
||
|
|
MapCacheRev *reventry;
|
||
|
|
hwaddr paddr_index;
|
||
|
|
hwaddr size;
|
||
|
|
ram_addr_t raddr;
|
||
|
|
int found = 0;
|
||
|
|
|
||
|
|
mapcache_lock();
|
||
|
|
QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
|
||
|
|
if (reventry->vaddr_req == ptr) {
|
||
|
|
paddr_index = reventry->paddr_index;
|
||
|
|
size = reventry->size;
|
||
|
|
found = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!found) {
|
||
|
|
fprintf(stderr, "%s, could not find %p\n", __func__, ptr);
|
||
|
|
QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
|
||
|
|
DPRINTF(" "TARGET_FMT_plx" -> %p is present\n", reventry->paddr_index,
|
||
|
|
reventry->vaddr_req);
|
||
|
|
}
|
||
|
|
abort();
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
|
||
|
|
while (entry && (entry->paddr_index != paddr_index || entry->size != size)) {
|
||
|
|
entry = entry->next;
|
||
|
|
}
|
||
|
|
if (!entry) {
|
||
|
|
DPRINTF("Trying to find address %p that is not in the mapcache!\n", ptr);
|
||
|
|
raddr = 0;
|
||
|
|
} else {
|
||
|
|
raddr = (reventry->paddr_index << MCACHE_BUCKET_SHIFT) +
|
||
|
|
((unsigned long) ptr - (unsigned long) entry->vaddr_base);
|
||
|
|
}
|
||
|
|
mapcache_unlock();
|
||
|
|
return raddr;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void xen_invalidate_map_cache_entry_unlocked(uint8_t *buffer)
|
||
|
|
{
|
||
|
|
MapCacheEntry *entry = NULL, *pentry = NULL;
|
||
|
|
MapCacheRev *reventry;
|
||
|
|
hwaddr paddr_index;
|
||
|
|
hwaddr size;
|
||
|
|
int found = 0;
|
||
|
|
|
||
|
|
QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
|
||
|
|
if (reventry->vaddr_req == buffer) {
|
||
|
|
paddr_index = reventry->paddr_index;
|
||
|
|
size = reventry->size;
|
||
|
|
found = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!found) {
|
||
|
|
DPRINTF("%s, could not find %p\n", __func__, buffer);
|
||
|
|
QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
|
||
|
|
DPRINTF(" "TARGET_FMT_plx" -> %p is present\n", reventry->paddr_index, reventry->vaddr_req);
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
QTAILQ_REMOVE(&mapcache->locked_entries, reventry, next);
|
||
|
|
g_free(reventry);
|
||
|
|
|
||
|
|
if (mapcache->last_entry != NULL &&
|
||
|
|
mapcache->last_entry->paddr_index == paddr_index) {
|
||
|
|
mapcache->last_entry = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
|
||
|
|
while (entry && (entry->paddr_index != paddr_index || entry->size != size)) {
|
||
|
|
pentry = entry;
|
||
|
|
entry = entry->next;
|
||
|
|
}
|
||
|
|
if (!entry) {
|
||
|
|
DPRINTF("Trying to unmap address %p that is not in the mapcache!\n", buffer);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
entry->lock--;
|
||
|
|
if (entry->lock > 0 || pentry == NULL) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
pentry->next = entry->next;
|
||
|
|
ram_block_notify_remove(entry->vaddr_base, entry->size);
|
||
|
|
if (munmap(entry->vaddr_base, entry->size) != 0) {
|
||
|
|
perror("unmap fails");
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
g_free(entry->valid_mapping);
|
||
|
|
g_free(entry);
|
||
|
|
}
|
||
|
|
|
||
|
|
void xen_invalidate_map_cache_entry(uint8_t *buffer)
|
||
|
|
{
|
||
|
|
mapcache_lock();
|
||
|
|
xen_invalidate_map_cache_entry_unlocked(buffer);
|
||
|
|
mapcache_unlock();
|
||
|
|
}
|
||
|
|
|
||
|
|
void xen_invalidate_map_cache(void)
|
||
|
|
{
|
||
|
|
unsigned long i;
|
||
|
|
MapCacheRev *reventry;
|
||
|
|
|
||
|
|
/* Flush pending AIO before destroying the mapcache */
|
||
|
|
bdrv_drain_all();
|
||
|
|
|
||
|
|
mapcache_lock();
|
||
|
|
|
||
|
|
QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
|
||
|
|
if (!reventry->dma) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
fprintf(stderr, "Locked DMA mapping while invalidating mapcache!"
|
||
|
|
" "TARGET_FMT_plx" -> %p is present\n",
|
||
|
|
reventry->paddr_index, reventry->vaddr_req);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < mapcache->nr_buckets; i++) {
|
||
|
|
MapCacheEntry *entry = &mapcache->entry[i];
|
||
|
|
|
||
|
|
if (entry->vaddr_base == NULL) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
if (entry->lock > 0) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (munmap(entry->vaddr_base, entry->size) != 0) {
|
||
|
|
perror("unmap fails");
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
entry->paddr_index = 0;
|
||
|
|
entry->vaddr_base = NULL;
|
||
|
|
entry->size = 0;
|
||
|
|
g_free(entry->valid_mapping);
|
||
|
|
entry->valid_mapping = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
mapcache->last_entry = NULL;
|
||
|
|
|
||
|
|
mapcache_unlock();
|
||
|
|
}
|
||
|
|
|
||
|
|
static uint8_t *xen_replace_cache_entry_unlocked(hwaddr old_phys_addr,
|
||
|
|
hwaddr new_phys_addr,
|
||
|
|
hwaddr size)
|
||
|
|
{
|
||
|
|
MapCacheEntry *entry;
|
||
|
|
hwaddr address_index, address_offset;
|
||
|
|
hwaddr test_bit_size, cache_size = size;
|
||
|
|
|
||
|
|
address_index = old_phys_addr >> MCACHE_BUCKET_SHIFT;
|
||
|
|
address_offset = old_phys_addr & (MCACHE_BUCKET_SIZE - 1);
|
||
|
|
|
||
|
|
assert(size);
|
||
|
|
/* test_bit_size is always a multiple of XC_PAGE_SIZE */
|
||
|
|
test_bit_size = size + (old_phys_addr & (XC_PAGE_SIZE - 1));
|
||
|
|
if (test_bit_size % XC_PAGE_SIZE) {
|
||
|
|
test_bit_size += XC_PAGE_SIZE - (test_bit_size % XC_PAGE_SIZE);
|
||
|
|
}
|
||
|
|
cache_size = size + address_offset;
|
||
|
|
if (cache_size % MCACHE_BUCKET_SIZE) {
|
||
|
|
cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
|
||
|
|
}
|
||
|
|
|
||
|
|
entry = &mapcache->entry[address_index % mapcache->nr_buckets];
|
||
|
|
while (entry && !(entry->paddr_index == address_index &&
|
||
|
|
entry->size == cache_size)) {
|
||
|
|
entry = entry->next;
|
||
|
|
}
|
||
|
|
if (!entry) {
|
||
|
|
DPRINTF("Trying to update an entry for "TARGET_FMT_plx \
|
||
|
|
"that is not in the mapcache!\n", old_phys_addr);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
address_index = new_phys_addr >> MCACHE_BUCKET_SHIFT;
|
||
|
|
address_offset = new_phys_addr & (MCACHE_BUCKET_SIZE - 1);
|
||
|
|
|
||
|
|
fprintf(stderr, "Replacing a dummy mapcache entry for "TARGET_FMT_plx \
|
||
|
|
" with "TARGET_FMT_plx"\n", old_phys_addr, new_phys_addr);
|
||
|
|
|
||
|
|
xen_remap_bucket(entry, entry->vaddr_base,
|
||
|
|
cache_size, address_index, false);
|
||
|
|
if (!test_bits(address_offset >> XC_PAGE_SHIFT,
|
||
|
|
test_bit_size >> XC_PAGE_SHIFT,
|
||
|
|
entry->valid_mapping)) {
|
||
|
|
DPRINTF("Unable to update a mapcache entry for "TARGET_FMT_plx"!\n",
|
||
|
|
old_phys_addr);
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return entry->vaddr_base + address_offset;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint8_t *xen_replace_cache_entry(hwaddr old_phys_addr,
|
||
|
|
hwaddr new_phys_addr,
|
||
|
|
hwaddr size)
|
||
|
|
{
|
||
|
|
uint8_t *p;
|
||
|
|
|
||
|
|
mapcache_lock();
|
||
|
|
p = xen_replace_cache_entry_unlocked(old_phys_addr, new_phys_addr, size);
|
||
|
|
mapcache_unlock();
|
||
|
|
return p;
|
||
|
|
}
|