subdir('xen')
i386_ss.add_all(xenpv_ss)
+i386_ss.add_all(xen_ss)
hw_arch += {'i386': i386_ss}
i386_ss.add(when: 'CONFIG_XEN', if_true: files(
'xen-hvm.c',
- 'xen-mapcache.c',
'xen_apic.c',
'xen_pvdevice.c',
))
cpu_ioreq_config_read(void *req, uint32_t sbdf, uint32_t reg, uint32_t size, uint32_t data) "I/O=%p sbdf=0x%x reg=%u size=%u data=0x%x"
cpu_ioreq_config_write(void *req, uint32_t sbdf, uint32_t reg, uint32_t size, uint32_t data) "I/O=%p sbdf=0x%x reg=%u size=%u data=0x%x"
-# xen-mapcache.c
-xen_map_cache(uint64_t phys_addr) "want 0x%"PRIx64
-xen_remap_bucket(uint64_t index) "index 0x%"PRIx64
-xen_map_cache_return(void* ptr) "%p"
-
+++ /dev/null
-/*
- * Copyright (C) 2011 Citrix Ltd.
- *
- * This work is licensed under the terms of the GNU GPL, version 2. See
- * the COPYING file in the top-level directory.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu/osdep.h"
-#include "qemu/units.h"
-#include "qemu/error-report.h"
-
-#include <sys/resource.h>
-
-#include "hw/xen/xen_native.h"
-#include "qemu/bitmap.h"
-
-#include "sysemu/runstate.h"
-#include "sysemu/xen-mapcache.h"
-#include "trace.h"
-
-
-//#define MAPCACHE_DEBUG
-
-#ifdef MAPCACHE_DEBUG
-# define DPRINTF(fmt, ...) do { \
- fprintf(stderr, "xen_mapcache: " fmt, ## __VA_ARGS__); \
-} while (0)
-#else
-# define DPRINTF(fmt, ...) do { } while (0)
-#endif
-
-#if HOST_LONG_BITS == 32
-# define MCACHE_BUCKET_SHIFT 16
-# define MCACHE_MAX_SIZE (1UL<<31) /* 2GB Cap */
-#else
-# define MCACHE_BUCKET_SHIFT 20
-# define MCACHE_MAX_SIZE (1UL<<35) /* 32GB Cap */
-#endif
-#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT)
-
-/* This is the size of the virtual address space reserve to QEMU that will not
- * be use by MapCache.
- * From empirical tests I observed that qemu use 75MB more than the
- * max_mcache_size.
- */
-#define NON_MCACHE_MEMORY_SIZE (80 * MiB)
-
-typedef struct MapCacheEntry {
- hwaddr paddr_index;
- uint8_t *vaddr_base;
- unsigned long *valid_mapping;
- uint32_t lock;
-#define XEN_MAPCACHE_ENTRY_DUMMY (1 << 0)
- uint8_t flags;
- hwaddr size;
- struct MapCacheEntry *next;
-} MapCacheEntry;
-
-typedef struct MapCacheRev {
- uint8_t *vaddr_req;
- hwaddr paddr_index;
- hwaddr size;
- QTAILQ_ENTRY(MapCacheRev) next;
- bool dma;
-} MapCacheRev;
-
-typedef struct MapCache {
- MapCacheEntry *entry;
- unsigned long nr_buckets;
- QTAILQ_HEAD(, MapCacheRev) locked_entries;
-
- /* For most cases (>99.9%), the page address is the same. */
- MapCacheEntry *last_entry;
- unsigned long max_mcache_size;
- unsigned int mcache_bucket_shift;
-
- phys_offset_to_gaddr_t phys_offset_to_gaddr;
- QemuMutex lock;
- void *opaque;
-} MapCache;
-
-static MapCache *mapcache;
-
-static inline void mapcache_lock(void)
-{
- qemu_mutex_lock(&mapcache->lock);
-}
-
-static inline void mapcache_unlock(void)
-{
- qemu_mutex_unlock(&mapcache->lock);
-}
-
-static inline int test_bits(int nr, int size, const unsigned long *addr)
-{
- unsigned long res = find_next_zero_bit(addr, size + nr, nr);
- if (res >= nr + size)
- return 1;
- else
- return 0;
-}
-
-void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
-{
- unsigned long size;
- struct rlimit rlimit_as;
-
- mapcache = g_new0(MapCache, 1);
-
- mapcache->phys_offset_to_gaddr = f;
- mapcache->opaque = opaque;
- qemu_mutex_init(&mapcache->lock);
-
- QTAILQ_INIT(&mapcache->locked_entries);
-
- if (geteuid() == 0) {
- rlimit_as.rlim_cur = RLIM_INFINITY;
- rlimit_as.rlim_max = RLIM_INFINITY;
- mapcache->max_mcache_size = MCACHE_MAX_SIZE;
- } else {
- getrlimit(RLIMIT_AS, &rlimit_as);
- rlimit_as.rlim_cur = rlimit_as.rlim_max;
-
- if (rlimit_as.rlim_max != RLIM_INFINITY) {
- warn_report("QEMU's maximum size of virtual"
- " memory is not infinity");
- }
- if (rlimit_as.rlim_max < MCACHE_MAX_SIZE + NON_MCACHE_MEMORY_SIZE) {
- mapcache->max_mcache_size = rlimit_as.rlim_max -
- NON_MCACHE_MEMORY_SIZE;
- } else {
- mapcache->max_mcache_size = MCACHE_MAX_SIZE;
- }
- }
-
- setrlimit(RLIMIT_AS, &rlimit_as);
-
- mapcache->nr_buckets =
- (((mapcache->max_mcache_size >> XC_PAGE_SHIFT) +
- (1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >>
- (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT));
-
- size = mapcache->nr_buckets * sizeof (MapCacheEntry);
- size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
- DPRINTF("%s, nr_buckets = %lx size %lu\n", __func__,
- mapcache->nr_buckets, size);
- mapcache->entry = g_malloc0(size);
-}
-
-static void xen_remap_bucket(MapCacheEntry *entry,
- void *vaddr,
- hwaddr size,
- hwaddr address_index,
- bool dummy)
-{
- uint8_t *vaddr_base;
- xen_pfn_t *pfns;
- int *err;
- unsigned int i;
- hwaddr nb_pfn = size >> XC_PAGE_SHIFT;
-
- trace_xen_remap_bucket(address_index);
-
- pfns = g_new0(xen_pfn_t, nb_pfn);
- err = g_new0(int, nb_pfn);
-
- if (entry->vaddr_base != NULL) {
- if (!(entry->flags & XEN_MAPCACHE_ENTRY_DUMMY)) {
- ram_block_notify_remove(entry->vaddr_base, entry->size,
- entry->size);
- }
-
- /*
- * If an entry is being replaced by another mapping and we're using
- * MAP_FIXED flag for it - there is possibility of a race for vaddr
- * address with another thread doing an mmap call itself
- * (see man 2 mmap). To avoid that we skip explicit unmapping here
- * and allow the kernel to destroy the previous mappings by replacing
- * them in mmap call later.
- *
- * Non-identical replacements are not allowed therefore.
- */
- assert(!vaddr || (entry->vaddr_base == vaddr && entry->size == size));
-
- if (!vaddr && munmap(entry->vaddr_base, entry->size) != 0) {
- perror("unmap fails");
- exit(-1);
- }
- }
- g_free(entry->valid_mapping);
- entry->valid_mapping = NULL;
-
- for (i = 0; i < nb_pfn; i++) {
- pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i;
- }
-
- /*
- * If the caller has requested the mapping at a specific address use
- * MAP_FIXED to make sure it's honored.
- */
- if (!dummy) {
- vaddr_base = xenforeignmemory_map2(xen_fmem, xen_domid, vaddr,
- PROT_READ | PROT_WRITE,
- vaddr ? MAP_FIXED : 0,
- nb_pfn, pfns, err);
- if (vaddr_base == NULL) {
- perror("xenforeignmemory_map2");
- exit(-1);
- }
- } else {
- /*
- * We create dummy mappings where we are unable to create a foreign
- * mapping immediately due to certain circumstances (i.e. on resume now)
- */
- vaddr_base = mmap(vaddr, size, PROT_READ | PROT_WRITE,
- MAP_ANON | MAP_SHARED | (vaddr ? MAP_FIXED : 0),
- -1, 0);
- if (vaddr_base == MAP_FAILED) {
- perror("mmap");
- exit(-1);
- }
- }
-
- if (!(entry->flags & XEN_MAPCACHE_ENTRY_DUMMY)) {
- ram_block_notify_add(vaddr_base, size, size);
- }
-
- entry->vaddr_base = vaddr_base;
- entry->paddr_index = address_index;
- entry->size = size;
- entry->valid_mapping = g_new0(unsigned long,
- BITS_TO_LONGS(size >> XC_PAGE_SHIFT));
-
- if (dummy) {
- entry->flags |= XEN_MAPCACHE_ENTRY_DUMMY;
- } else {
- entry->flags &= ~(XEN_MAPCACHE_ENTRY_DUMMY);
- }
-
- bitmap_zero(entry->valid_mapping, nb_pfn);
- for (i = 0; i < nb_pfn; i++) {
- if (!err[i]) {
- bitmap_set(entry->valid_mapping, i, 1);
- }
- }
-
- g_free(pfns);
- g_free(err);
-}
-
-static uint8_t *xen_map_cache_unlocked(hwaddr phys_addr, hwaddr size,
- uint8_t lock, bool dma)
-{
- MapCacheEntry *entry, *pentry = NULL,
- *free_entry = NULL, *free_pentry = NULL;
- hwaddr address_index;
- hwaddr address_offset;
- hwaddr cache_size = size;
- hwaddr test_bit_size;
- bool translated G_GNUC_UNUSED = false;
- bool dummy = false;
-
-tryagain:
- address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
- address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
-
- trace_xen_map_cache(phys_addr);
-
- /* test_bit_size is always a multiple of XC_PAGE_SIZE */
- if (size) {
- test_bit_size = size + (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);
- }
- } else {
- test_bit_size = XC_PAGE_SIZE;
- }
-
- if (mapcache->last_entry != NULL &&
- mapcache->last_entry->paddr_index == address_index &&
- !lock && !size &&
- test_bits(address_offset >> XC_PAGE_SHIFT,
- test_bit_size >> XC_PAGE_SHIFT,
- mapcache->last_entry->valid_mapping)) {
- trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
- return mapcache->last_entry->vaddr_base + address_offset;
- }
-
- /* size is always a multiple of MCACHE_BUCKET_SIZE */
- if (size) {
- cache_size = size + address_offset;
- if (cache_size % MCACHE_BUCKET_SIZE) {
- cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
- }
- } else {
- cache_size = MCACHE_BUCKET_SIZE;
- }
-
- entry = &mapcache->entry[address_index % mapcache->nr_buckets];
-
- while (entry && (lock || entry->lock) && entry->vaddr_base &&
- (entry->paddr_index != address_index || entry->size != cache_size ||
- !test_bits(address_offset >> XC_PAGE_SHIFT,
- test_bit_size >> XC_PAGE_SHIFT,
- entry->valid_mapping))) {
- if (!free_entry && !entry->lock) {
- free_entry = entry;
- free_pentry = pentry;
- }
- pentry = entry;
- entry = entry->next;
- }
- if (!entry && free_entry) {
- entry = free_entry;
- pentry = free_pentry;
- }
- if (!entry) {
- entry = g_new0(MapCacheEntry, 1);
- pentry->next = entry;
- xen_remap_bucket(entry, NULL, cache_size, address_index, dummy);
- } else if (!entry->lock) {
- if (!entry->vaddr_base || entry->paddr_index != address_index ||
- entry->size != cache_size ||
- !test_bits(address_offset >> XC_PAGE_SHIFT,
- test_bit_size >> XC_PAGE_SHIFT,
- entry->valid_mapping)) {
- xen_remap_bucket(entry, NULL, cache_size, address_index, dummy);
- }
- }
-
- if(!test_bits(address_offset >> XC_PAGE_SHIFT,
- test_bit_size >> XC_PAGE_SHIFT,
- entry->valid_mapping)) {
- mapcache->last_entry = NULL;
-#ifdef XEN_COMPAT_PHYSMAP
- if (!translated && mapcache->phys_offset_to_gaddr) {
- phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size);
- translated = true;
- goto tryagain;
- }
-#endif
- if (!dummy && runstate_check(RUN_STATE_INMIGRATE)) {
- dummy = true;
- goto tryagain;
- }
- trace_xen_map_cache_return(NULL);
- return NULL;
- }
-
- mapcache->last_entry = entry;
- if (lock) {
- MapCacheRev *reventry = g_new0(MapCacheRev, 1);
- entry->lock++;
- if (entry->lock == 0) {
- fprintf(stderr,
- "mapcache entry lock overflow: "HWADDR_FMT_plx" -> %p\n",
- entry->paddr_index, entry->vaddr_base);
- abort();
- }
- reventry->dma = dma;
- reventry->vaddr_req = mapcache->last_entry->vaddr_base + address_offset;
- reventry->paddr_index = mapcache->last_entry->paddr_index;
- reventry->size = entry->size;
- QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next);
- }
-
- trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
- return mapcache->last_entry->vaddr_base + address_offset;
-}
-
-uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size,
- uint8_t lock, bool dma)
-{
- uint8_t *p;
-
- mapcache_lock();
- p = xen_map_cache_unlocked(phys_addr, size, lock, dma);
- mapcache_unlock();
- return p;
-}
-
-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(" "HWADDR_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(" "HWADDR_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, 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!"
- " "HWADDR_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 "HWADDR_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 "HWADDR_FMT_plx \
- " with "HWADDR_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 "HWADDR_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;
-}
endif
specific_ss.add_all(when: ['CONFIG_XEN', xen], if_true: xen_specific_ss)
+
+xen_ss = ss.source_set()
+
+xen_ss.add(when: 'CONFIG_XEN', if_true: files('xen-mapcache.c'))
xs_node_vscanf(char *path, char *value) "%s %s"
xs_node_watch(char *path) "%s"
xs_node_unwatch(char *path) "%s"
+
+# xen-mapcache.c
+xen_map_cache(uint64_t phys_addr) "want 0x%"PRIx64
+xen_remap_bucket(uint64_t index) "index 0x%"PRIx64
+xen_map_cache_return(void* ptr) "%p"
--- /dev/null
+/*
+ * Copyright (C) 2011 Citrix Ltd.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ * Contributions after 2012-01-13 are licensed under the terms of the
+ * GNU GPL, version 2 or (at your option) any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/units.h"
+#include "qemu/error-report.h"
+
+#include <sys/resource.h>
+
+#include "hw/xen/xen_native.h"
+#include "qemu/bitmap.h"
+
+#include "sysemu/runstate.h"
+#include "sysemu/xen-mapcache.h"
+#include "trace.h"
+
+
+//#define MAPCACHE_DEBUG
+
+#ifdef MAPCACHE_DEBUG
+# define DPRINTF(fmt, ...) do { \
+ fprintf(stderr, "xen_mapcache: " fmt, ## __VA_ARGS__); \
+} while (0)
+#else
+# define DPRINTF(fmt, ...) do { } while (0)
+#endif
+
+#if HOST_LONG_BITS == 32
+# define MCACHE_BUCKET_SHIFT 16
+# define MCACHE_MAX_SIZE (1UL<<31) /* 2GB Cap */
+#else
+# define MCACHE_BUCKET_SHIFT 20
+# define MCACHE_MAX_SIZE (1UL<<35) /* 32GB Cap */
+#endif
+#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT)
+
+/* This is the size of the virtual address space reserve to QEMU that will not
+ * be use by MapCache.
+ * From empirical tests I observed that qemu use 75MB more than the
+ * max_mcache_size.
+ */
+#define NON_MCACHE_MEMORY_SIZE (80 * MiB)
+
+typedef struct MapCacheEntry {
+ hwaddr paddr_index;
+ uint8_t *vaddr_base;
+ unsigned long *valid_mapping;
+ uint32_t lock;
+#define XEN_MAPCACHE_ENTRY_DUMMY (1 << 0)
+ uint8_t flags;
+ hwaddr size;
+ struct MapCacheEntry *next;
+} MapCacheEntry;
+
+typedef struct MapCacheRev {
+ uint8_t *vaddr_req;
+ hwaddr paddr_index;
+ hwaddr size;
+ QTAILQ_ENTRY(MapCacheRev) next;
+ bool dma;
+} MapCacheRev;
+
+typedef struct MapCache {
+ MapCacheEntry *entry;
+ unsigned long nr_buckets;
+ QTAILQ_HEAD(, MapCacheRev) locked_entries;
+
+ /* For most cases (>99.9%), the page address is the same. */
+ MapCacheEntry *last_entry;
+ unsigned long max_mcache_size;
+ unsigned int mcache_bucket_shift;
+
+ phys_offset_to_gaddr_t phys_offset_to_gaddr;
+ QemuMutex lock;
+ void *opaque;
+} MapCache;
+
+static MapCache *mapcache;
+
+static inline void mapcache_lock(void)
+{
+ qemu_mutex_lock(&mapcache->lock);
+}
+
+static inline void mapcache_unlock(void)
+{
+ qemu_mutex_unlock(&mapcache->lock);
+}
+
+static inline int test_bits(int nr, int size, const unsigned long *addr)
+{
+ unsigned long res = find_next_zero_bit(addr, size + nr, nr);
+ if (res >= nr + size)
+ return 1;
+ else
+ return 0;
+}
+
+void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
+{
+ unsigned long size;
+ struct rlimit rlimit_as;
+
+ mapcache = g_new0(MapCache, 1);
+
+ mapcache->phys_offset_to_gaddr = f;
+ mapcache->opaque = opaque;
+ qemu_mutex_init(&mapcache->lock);
+
+ QTAILQ_INIT(&mapcache->locked_entries);
+
+ if (geteuid() == 0) {
+ rlimit_as.rlim_cur = RLIM_INFINITY;
+ rlimit_as.rlim_max = RLIM_INFINITY;
+ mapcache->max_mcache_size = MCACHE_MAX_SIZE;
+ } else {
+ getrlimit(RLIMIT_AS, &rlimit_as);
+ rlimit_as.rlim_cur = rlimit_as.rlim_max;
+
+ if (rlimit_as.rlim_max != RLIM_INFINITY) {
+ warn_report("QEMU's maximum size of virtual"
+ " memory is not infinity");
+ }
+ if (rlimit_as.rlim_max < MCACHE_MAX_SIZE + NON_MCACHE_MEMORY_SIZE) {
+ mapcache->max_mcache_size = rlimit_as.rlim_max -
+ NON_MCACHE_MEMORY_SIZE;
+ } else {
+ mapcache->max_mcache_size = MCACHE_MAX_SIZE;
+ }
+ }
+
+ setrlimit(RLIMIT_AS, &rlimit_as);
+
+ mapcache->nr_buckets =
+ (((mapcache->max_mcache_size >> XC_PAGE_SHIFT) +
+ (1UL << (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT)) - 1) >>
+ (MCACHE_BUCKET_SHIFT - XC_PAGE_SHIFT));
+
+ size = mapcache->nr_buckets * sizeof (MapCacheEntry);
+ size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
+ DPRINTF("%s, nr_buckets = %lx size %lu\n", __func__,
+ mapcache->nr_buckets, size);
+ mapcache->entry = g_malloc0(size);
+}
+
+static void xen_remap_bucket(MapCacheEntry *entry,
+ void *vaddr,
+ hwaddr size,
+ hwaddr address_index,
+ bool dummy)
+{
+ uint8_t *vaddr_base;
+ xen_pfn_t *pfns;
+ int *err;
+ unsigned int i;
+ hwaddr nb_pfn = size >> XC_PAGE_SHIFT;
+
+ trace_xen_remap_bucket(address_index);
+
+ pfns = g_new0(xen_pfn_t, nb_pfn);
+ err = g_new0(int, nb_pfn);
+
+ if (entry->vaddr_base != NULL) {
+ if (!(entry->flags & XEN_MAPCACHE_ENTRY_DUMMY)) {
+ ram_block_notify_remove(entry->vaddr_base, entry->size,
+ entry->size);
+ }
+
+ /*
+ * If an entry is being replaced by another mapping and we're using
+ * MAP_FIXED flag for it - there is possibility of a race for vaddr
+ * address with another thread doing an mmap call itself
+ * (see man 2 mmap). To avoid that we skip explicit unmapping here
+ * and allow the kernel to destroy the previous mappings by replacing
+ * them in mmap call later.
+ *
+ * Non-identical replacements are not allowed therefore.
+ */
+ assert(!vaddr || (entry->vaddr_base == vaddr && entry->size == size));
+
+ if (!vaddr && munmap(entry->vaddr_base, entry->size) != 0) {
+ perror("unmap fails");
+ exit(-1);
+ }
+ }
+ g_free(entry->valid_mapping);
+ entry->valid_mapping = NULL;
+
+ for (i = 0; i < nb_pfn; i++) {
+ pfns[i] = (address_index << (MCACHE_BUCKET_SHIFT-XC_PAGE_SHIFT)) + i;
+ }
+
+ /*
+ * If the caller has requested the mapping at a specific address use
+ * MAP_FIXED to make sure it's honored.
+ */
+ if (!dummy) {
+ vaddr_base = xenforeignmemory_map2(xen_fmem, xen_domid, vaddr,
+ PROT_READ | PROT_WRITE,
+ vaddr ? MAP_FIXED : 0,
+ nb_pfn, pfns, err);
+ if (vaddr_base == NULL) {
+ perror("xenforeignmemory_map2");
+ exit(-1);
+ }
+ } else {
+ /*
+ * We create dummy mappings where we are unable to create a foreign
+ * mapping immediately due to certain circumstances (i.e. on resume now)
+ */
+ vaddr_base = mmap(vaddr, size, PROT_READ | PROT_WRITE,
+ MAP_ANON | MAP_SHARED | (vaddr ? MAP_FIXED : 0),
+ -1, 0);
+ if (vaddr_base == MAP_FAILED) {
+ perror("mmap");
+ exit(-1);
+ }
+ }
+
+ if (!(entry->flags & XEN_MAPCACHE_ENTRY_DUMMY)) {
+ ram_block_notify_add(vaddr_base, size, size);
+ }
+
+ entry->vaddr_base = vaddr_base;
+ entry->paddr_index = address_index;
+ entry->size = size;
+ entry->valid_mapping = g_new0(unsigned long,
+ BITS_TO_LONGS(size >> XC_PAGE_SHIFT));
+
+ if (dummy) {
+ entry->flags |= XEN_MAPCACHE_ENTRY_DUMMY;
+ } else {
+ entry->flags &= ~(XEN_MAPCACHE_ENTRY_DUMMY);
+ }
+
+ bitmap_zero(entry->valid_mapping, nb_pfn);
+ for (i = 0; i < nb_pfn; i++) {
+ if (!err[i]) {
+ bitmap_set(entry->valid_mapping, i, 1);
+ }
+ }
+
+ g_free(pfns);
+ g_free(err);
+}
+
+static uint8_t *xen_map_cache_unlocked(hwaddr phys_addr, hwaddr size,
+ uint8_t lock, bool dma)
+{
+ MapCacheEntry *entry, *pentry = NULL,
+ *free_entry = NULL, *free_pentry = NULL;
+ hwaddr address_index;
+ hwaddr address_offset;
+ hwaddr cache_size = size;
+ hwaddr test_bit_size;
+ bool translated G_GNUC_UNUSED = false;
+ bool dummy = false;
+
+tryagain:
+ address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
+ address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
+
+ trace_xen_map_cache(phys_addr);
+
+ /* test_bit_size is always a multiple of XC_PAGE_SIZE */
+ if (size) {
+ test_bit_size = size + (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);
+ }
+ } else {
+ test_bit_size = XC_PAGE_SIZE;
+ }
+
+ if (mapcache->last_entry != NULL &&
+ mapcache->last_entry->paddr_index == address_index &&
+ !lock && !size &&
+ test_bits(address_offset >> XC_PAGE_SHIFT,
+ test_bit_size >> XC_PAGE_SHIFT,
+ mapcache->last_entry->valid_mapping)) {
+ trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
+ return mapcache->last_entry->vaddr_base + address_offset;
+ }
+
+ /* size is always a multiple of MCACHE_BUCKET_SIZE */
+ if (size) {
+ cache_size = size + address_offset;
+ if (cache_size % MCACHE_BUCKET_SIZE) {
+ cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
+ }
+ } else {
+ cache_size = MCACHE_BUCKET_SIZE;
+ }
+
+ entry = &mapcache->entry[address_index % mapcache->nr_buckets];
+
+ while (entry && (lock || entry->lock) && entry->vaddr_base &&
+ (entry->paddr_index != address_index || entry->size != cache_size ||
+ !test_bits(address_offset >> XC_PAGE_SHIFT,
+ test_bit_size >> XC_PAGE_SHIFT,
+ entry->valid_mapping))) {
+ if (!free_entry && !entry->lock) {
+ free_entry = entry;
+ free_pentry = pentry;
+ }
+ pentry = entry;
+ entry = entry->next;
+ }
+ if (!entry && free_entry) {
+ entry = free_entry;
+ pentry = free_pentry;
+ }
+ if (!entry) {
+ entry = g_new0(MapCacheEntry, 1);
+ pentry->next = entry;
+ xen_remap_bucket(entry, NULL, cache_size, address_index, dummy);
+ } else if (!entry->lock) {
+ if (!entry->vaddr_base || entry->paddr_index != address_index ||
+ entry->size != cache_size ||
+ !test_bits(address_offset >> XC_PAGE_SHIFT,
+ test_bit_size >> XC_PAGE_SHIFT,
+ entry->valid_mapping)) {
+ xen_remap_bucket(entry, NULL, cache_size, address_index, dummy);
+ }
+ }
+
+ if(!test_bits(address_offset >> XC_PAGE_SHIFT,
+ test_bit_size >> XC_PAGE_SHIFT,
+ entry->valid_mapping)) {
+ mapcache->last_entry = NULL;
+#ifdef XEN_COMPAT_PHYSMAP
+ if (!translated && mapcache->phys_offset_to_gaddr) {
+ phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size);
+ translated = true;
+ goto tryagain;
+ }
+#endif
+ if (!dummy && runstate_check(RUN_STATE_INMIGRATE)) {
+ dummy = true;
+ goto tryagain;
+ }
+ trace_xen_map_cache_return(NULL);
+ return NULL;
+ }
+
+ mapcache->last_entry = entry;
+ if (lock) {
+ MapCacheRev *reventry = g_new0(MapCacheRev, 1);
+ entry->lock++;
+ if (entry->lock == 0) {
+ fprintf(stderr,
+ "mapcache entry lock overflow: "HWADDR_FMT_plx" -> %p\n",
+ entry->paddr_index, entry->vaddr_base);
+ abort();
+ }
+ reventry->dma = dma;
+ reventry->vaddr_req = mapcache->last_entry->vaddr_base + address_offset;
+ reventry->paddr_index = mapcache->last_entry->paddr_index;
+ reventry->size = entry->size;
+ QTAILQ_INSERT_HEAD(&mapcache->locked_entries, reventry, next);
+ }
+
+ trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
+ return mapcache->last_entry->vaddr_base + address_offset;
+}
+
+uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size,
+ uint8_t lock, bool dma)
+{
+ uint8_t *p;
+
+ mapcache_lock();
+ p = xen_map_cache_unlocked(phys_addr, size, lock, dma);
+ mapcache_unlock();
+ return p;
+}
+
+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(" "HWADDR_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(" "HWADDR_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, 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!"
+ " "HWADDR_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 "HWADDR_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 "HWADDR_FMT_plx \
+ " with "HWADDR_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 "HWADDR_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;
+}
projects / qemu.git / commitdiff