* 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 "config.h"
#include <sys/resource.h>
-#include "hw/xen_backend.h"
-#include "blockdev.h"
+#include "hw/xen/xen_backend.h"
+#include "sysemu/blockdev.h"
+#include "qemu/bitmap.h"
#include <xen/hvm/params.h>
#include <sys/mman.h>
-#include "xen-mapcache.h"
+#include "sysemu/xen-mapcache.h"
#include "trace.h"
#if defined(__i386__)
# define MCACHE_BUCKET_SHIFT 16
+# define MCACHE_MAX_SIZE (1UL<<31) /* 2GB Cap */
#elif defined(__x86_64__)
# define MCACHE_BUCKET_SHIFT 20
+# define MCACHE_MAX_SIZE (1UL<<35) /* 32GB Cap */
#endif
#define MCACHE_BUCKET_SIZE (1UL << MCACHE_BUCKET_SHIFT)
-#define BITS_PER_LONG (sizeof(long) * 8)
-#define BITS_TO_LONGS(bits) (((bits) + BITS_PER_LONG - 1) / BITS_PER_LONG)
-#define DECLARE_BITMAP(name, bits) unsigned long name[BITS_TO_LONGS(bits)]
+/* 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 * 1024 * 1024)
+
+#define mapcache_lock() ((void)0)
+#define mapcache_unlock() ((void)0)
typedef struct MapCacheEntry {
- target_phys_addr_t paddr_index;
+ hwaddr paddr_index;
uint8_t *vaddr_base;
- DECLARE_BITMAP(valid_mapping, MCACHE_BUCKET_SIZE >> XC_PAGE_SHIFT);
+ unsigned long *valid_mapping;
uint8_t lock;
+ hwaddr size;
struct MapCacheEntry *next;
} MapCacheEntry;
typedef struct MapCacheRev {
uint8_t *vaddr_req;
- target_phys_addr_t paddr_index;
+ hwaddr paddr_index;
+ hwaddr size;
QTAILQ_ENTRY(MapCacheRev) next;
} MapCacheRev;
QTAILQ_HEAD(map_cache_head, MapCacheRev) locked_entries;
/* For most cases (>99.9%), the page address is the same. */
- target_phys_addr_t last_address_index;
- uint8_t *last_address_vaddr;
+ MapCacheEntry *last_entry;
unsigned long max_mcache_size;
unsigned int mcache_bucket_shift;
+
+ phys_offset_to_gaddr_t phys_offset_to_gaddr;
+ void *opaque;
} MapCache;
static MapCache *mapcache;
-static inline int test_bit(unsigned int bit, const unsigned long *map)
+static inline int test_bits(int nr, int size, const unsigned long *addr)
{
- return !!((map)[(bit) / BITS_PER_LONG] & (1UL << ((bit) % BITS_PER_LONG)));
+ unsigned long res = find_next_zero_bit(addr, size + nr, nr);
+ if (res >= nr + size)
+ return 1;
+ else
+ return 0;
}
-void qemu_map_cache_init(void)
+void xen_map_cache_init(phys_offset_to_gaddr_t f, void *opaque)
{
unsigned long size;
struct rlimit rlimit_as;
- mapcache = qemu_mallocz(sizeof (MapCache));
+ mapcache = g_malloc0(sizeof (MapCache));
+
+ mapcache->phys_offset_to_gaddr = f;
+ mapcache->opaque = opaque;
QTAILQ_INIT(&mapcache->locked_entries);
- mapcache->last_address_index = -1;
- getrlimit(RLIMIT_AS, &rlimit_as);
- rlimit_as.rlim_cur = rlimit_as.rlim_max;
+ 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) {
+ fprintf(stderr, "Warning: QEMU's maximum size of virtual"
+ " memory is not infinity.\n");
+ }
+ 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->max_mcache_size = rlimit_as.rlim_max;
mapcache->nr_buckets =
(((mapcache->max_mcache_size >> XC_PAGE_SHIFT) +
size = mapcache->nr_buckets * sizeof (MapCacheEntry);
size = (size + XC_PAGE_SIZE - 1) & ~(XC_PAGE_SIZE - 1);
- DPRINTF("qemu_map_cache_init, nr_buckets = %lx size %lu\n", mapcache->nr_buckets, size);
- mapcache->entry = qemu_mallocz(size);
+ DPRINTF("%s, nr_buckets = %lx size %lu\n", __func__,
+ mapcache->nr_buckets, size);
+ mapcache->entry = g_malloc0(size);
}
-static void qemu_remap_bucket(MapCacheEntry *entry,
- target_phys_addr_t size,
- target_phys_addr_t address_index)
+static void xen_remap_bucket(MapCacheEntry *entry,
+ hwaddr size,
+ hwaddr address_index)
{
uint8_t *vaddr_base;
xen_pfn_t *pfns;
int *err;
- unsigned int i, j;
- target_phys_addr_t nb_pfn = size >> XC_PAGE_SHIFT;
+ unsigned int i;
+ hwaddr nb_pfn = size >> XC_PAGE_SHIFT;
- trace_qemu_remap_bucket(address_index);
+ trace_xen_remap_bucket(address_index);
- pfns = qemu_mallocz(nb_pfn * sizeof (xen_pfn_t));
- err = qemu_mallocz(nb_pfn * sizeof (int));
+ pfns = g_malloc0(nb_pfn * sizeof (xen_pfn_t));
+ err = g_malloc0(nb_pfn * sizeof (int));
if (entry->vaddr_base != NULL) {
- if (munmap(entry->vaddr_base, size) != 0) {
+ if (munmap(entry->vaddr_base, entry->size) != 0) {
perror("unmap fails");
exit(-1);
}
}
+ if (entry->valid_mapping != NULL) {
+ 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;
entry->vaddr_base = vaddr_base;
entry->paddr_index = address_index;
+ entry->size = size;
+ entry->valid_mapping = (unsigned long *) g_malloc0(sizeof(unsigned long) *
+ BITS_TO_LONGS(size >> XC_PAGE_SHIFT));
- for (i = 0; i < nb_pfn; i += BITS_PER_LONG) {
- unsigned long word = 0;
- if ((i + BITS_PER_LONG) > nb_pfn) {
- j = nb_pfn % BITS_PER_LONG;
- } else {
- j = BITS_PER_LONG;
- }
- while (j > 0) {
- word = (word << 1) | !err[i + --j];
+ bitmap_zero(entry->valid_mapping, nb_pfn);
+ for (i = 0; i < nb_pfn; i++) {
+ if (!err[i]) {
+ bitmap_set(entry->valid_mapping, i, 1);
}
- entry->valid_mapping[i / BITS_PER_LONG] = word;
}
- qemu_free(pfns);
- qemu_free(err);
+ g_free(pfns);
+ g_free(err);
}
-uint8_t *qemu_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size, uint8_t lock)
+uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size,
+ uint8_t lock)
{
MapCacheEntry *entry, *pentry = NULL;
- target_phys_addr_t address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
- target_phys_addr_t address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
+ hwaddr address_index;
+ hwaddr address_offset;
+ hwaddr __size = size;
+ hwaddr __test_bit_size = size;
+ bool translated = false;
- trace_qemu_map_cache(phys_addr);
+tryagain:
+ address_index = phys_addr >> MCACHE_BUCKET_SHIFT;
+ address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
- if (address_index == mapcache->last_address_index && !lock) {
- trace_qemu_map_cache_return(mapcache->last_address_vaddr + address_offset);
- return mapcache->last_address_vaddr + address_offset;
+ 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) {
+ __size = size + address_offset;
+ if (__size % MCACHE_BUCKET_SIZE) {
+ __size += MCACHE_BUCKET_SIZE - (__size % MCACHE_BUCKET_SIZE);
+ }
+ } else {
+ __size = MCACHE_BUCKET_SIZE;
}
entry = &mapcache->entry[address_index % mapcache->nr_buckets];
- while (entry && entry->lock && entry->paddr_index != address_index && entry->vaddr_base) {
+ while (entry && entry->lock && entry->vaddr_base &&
+ (entry->paddr_index != address_index || entry->size != __size ||
+ !test_bits(address_offset >> XC_PAGE_SHIFT,
+ __test_bit_size >> XC_PAGE_SHIFT,
+ entry->valid_mapping))) {
pentry = entry;
entry = entry->next;
}
if (!entry) {
- entry = qemu_mallocz(sizeof (MapCacheEntry));
+ entry = g_malloc0(sizeof (MapCacheEntry));
pentry->next = entry;
- qemu_remap_bucket(entry, size ? : MCACHE_BUCKET_SIZE, address_index);
+ xen_remap_bucket(entry, __size, address_index);
} else if (!entry->lock) {
if (!entry->vaddr_base || entry->paddr_index != address_index ||
- !test_bit(address_offset >> XC_PAGE_SHIFT, entry->valid_mapping)) {
- qemu_remap_bucket(entry, size ? : MCACHE_BUCKET_SIZE, address_index);
+ entry->size != __size ||
+ !test_bits(address_offset >> XC_PAGE_SHIFT,
+ __test_bit_size >> XC_PAGE_SHIFT,
+ entry->valid_mapping)) {
+ xen_remap_bucket(entry, __size, address_index);
}
}
- if (!test_bit(address_offset >> XC_PAGE_SHIFT, entry->valid_mapping)) {
- mapcache->last_address_index = -1;
- trace_qemu_map_cache_return(NULL);
+ if(!test_bits(address_offset >> XC_PAGE_SHIFT,
+ __test_bit_size >> XC_PAGE_SHIFT,
+ entry->valid_mapping)) {
+ mapcache->last_entry = NULL;
+ if (!translated && mapcache->phys_offset_to_gaddr) {
+ phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size, mapcache->opaque);
+ translated = true;
+ goto tryagain;
+ }
+ trace_xen_map_cache_return(NULL);
return NULL;
}
- mapcache->last_address_index = address_index;
- mapcache->last_address_vaddr = entry->vaddr_base;
+ mapcache->last_entry = entry;
if (lock) {
- MapCacheRev *reventry = qemu_mallocz(sizeof(MapCacheRev));
+ MapCacheRev *reventry = g_malloc0(sizeof(MapCacheRev));
entry->lock++;
- reventry->vaddr_req = mapcache->last_address_vaddr + address_offset;
- reventry->paddr_index = mapcache->last_address_index;
+ 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_qemu_map_cache_return(mapcache->last_address_vaddr + address_offset);
- return mapcache->last_address_vaddr + address_offset;
+ trace_xen_map_cache_return(mapcache->last_entry->vaddr_base + address_offset);
+ return mapcache->last_entry->vaddr_base + address_offset;
}
-ram_addr_t qemu_ram_addr_from_mapcache(void *ptr)
+ram_addr_t xen_ram_addr_from_mapcache(void *ptr)
{
+ MapCacheEntry *entry = NULL;
MapCacheRev *reventry;
- target_phys_addr_t paddr_index;
+ hwaddr paddr_index;
+ hwaddr size;
int found = 0;
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, "qemu_ram_addr_from_mapcache, could not find %p\n", ptr);
+ 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);
return 0;
}
- return paddr_index << MCACHE_BUCKET_SHIFT;
+ 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);
+ return 0;
+ }
+ return (reventry->paddr_index << MCACHE_BUCKET_SHIFT) +
+ ((unsigned long) ptr - (unsigned long) entry->vaddr_base);
}
-void qemu_invalidate_entry(uint8_t *buffer)
+void xen_invalidate_map_cache_entry(uint8_t *buffer)
{
MapCacheEntry *entry = NULL, *pentry = NULL;
MapCacheRev *reventry;
- target_phys_addr_t paddr_index;
+ hwaddr paddr_index;
+ hwaddr size;
int found = 0;
- if (mapcache->last_address_vaddr == buffer) {
- mapcache->last_address_index = -1;
- }
-
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("qemu_invalidate_entry, could not find %p\n", buffer);
+ 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);
- qemu_free(reventry);
+ 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) {
+ while (entry && (entry->paddr_index != paddr_index || entry->size != size)) {
pentry = entry;
entry = entry->next;
}
}
pentry->next = entry->next;
- if (munmap(entry->vaddr_base, MCACHE_BUCKET_SIZE) != 0) {
+ if (munmap(entry->vaddr_base, entry->size) != 0) {
perror("unmap fails");
exit(-1);
}
- qemu_free(entry);
+ g_free(entry->valid_mapping);
+ g_free(entry);
}
-void qemu_invalidate_map_cache(void)
+void xen_invalidate_map_cache(void)
{
unsigned long i;
MapCacheRev *reventry;
/* Flush pending AIO before destroying the mapcache */
- qemu_aio_flush();
+ bdrv_drain_all();
QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
DPRINTF("There should be no locked mappings at this time, "
if (entry->vaddr_base == NULL) {
continue;
}
+ if (entry->lock > 0) {
+ continue;
+ }
- if (munmap(entry->vaddr_base, MCACHE_BUCKET_SIZE) != 0) {
+ 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_address_index = -1;
- mapcache->last_address_vaddr = NULL;
+ mapcache->last_entry = NULL;
mapcache_unlock();
}
-
-uint8_t *xen_map_block(target_phys_addr_t phys_addr, target_phys_addr_t size)
-{
- uint8_t *vaddr_base;
- xen_pfn_t *pfns;
- int *err;
- unsigned int i;
- target_phys_addr_t nb_pfn = size >> XC_PAGE_SHIFT;
-
- trace_xen_map_block(phys_addr, size);
- phys_addr >>= XC_PAGE_SHIFT;
-
- pfns = qemu_mallocz(nb_pfn * sizeof (xen_pfn_t));
- err = qemu_mallocz(nb_pfn * sizeof (int));
-
- for (i = 0; i < nb_pfn; i++) {
- pfns[i] = phys_addr + i;
- }
-
- vaddr_base = xc_map_foreign_bulk(xen_xc, xen_domid, PROT_READ|PROT_WRITE,
- pfns, err, nb_pfn);
- if (vaddr_base == NULL) {
- perror("xc_map_foreign_bulk");
- exit(-1);
- }
-
- qemu_free(pfns);
- qemu_free(err);
-
- return vaddr_base;
-}
projects / qemu.git / blobdiff