2 = Adaptive rate instruction counting. */
int use_icount;
+uintptr_t qemu_host_page_size;
+intptr_t qemu_host_page_mask;
+uintptr_t qemu_real_host_page_size;
+intptr_t qemu_real_host_page_mask;
+
bool set_preferred_target_page_bits(int bits)
{
/* The target page size is the lowest common denominator for all
return size;
}
-static void *file_ram_alloc(RAMBlock *block,
- ram_addr_t memory,
- const char *path,
- Error **errp)
+static int file_ram_open(const char *path,
+ const char *region_name,
+ bool *created,
+ Error **errp)
{
- bool unlink_on_error = false;
char *filename;
char *sanitized_name;
char *c;
- void *area = MAP_FAILED;
int fd = -1;
- int64_t file_size;
-
- if (kvm_enabled() && !kvm_has_sync_mmu()) {
- error_setg(errp,
- "host lacks kvm mmu notifiers, -mem-path unsupported");
- return NULL;
- }
+ *created = false;
for (;;) {
fd = open(path, O_RDWR);
if (fd >= 0) {
/* @path names a file that doesn't exist, create it */
fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0644);
if (fd >= 0) {
- unlink_on_error = true;
+ *created = true;
break;
}
} else if (errno == EISDIR) {
/* @path names a directory, create a file there */
/* Make name safe to use with mkstemp by replacing '/' with '_'. */
- sanitized_name = g_strdup(memory_region_name(block->mr));
+ sanitized_name = g_strdup(region_name);
for (c = sanitized_name; *c != '\0'; c++) {
if (*c == '/') {
*c = '_';
error_setg_errno(errp, errno,
"can't open backing store %s for guest RAM",
path);
- goto error;
+ return -1;
}
/*
* Try again on EINTR and EEXIST. The latter happens when
*/
}
+ return fd;
+}
+
+static void *file_ram_alloc(RAMBlock *block,
+ ram_addr_t memory,
+ int fd,
+ bool truncate,
+ Error **errp)
+{
+ void *area;
+
block->page_size = qemu_fd_getpagesize(fd);
block->mr->align = block->page_size;
#if defined(__s390x__)
}
#endif
- file_size = get_file_size(fd);
-
if (memory < block->page_size) {
error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to "
"or larger than page size 0x%zx",
memory, block->page_size);
- goto error;
- }
-
- if (file_size > 0 && file_size < memory) {
- error_setg(errp, "backing store %s size 0x%" PRIx64
- " does not match 'size' option 0x" RAM_ADDR_FMT,
- path, file_size, memory);
- goto error;
+ return NULL;
}
memory = ROUND_UP(memory, block->page_size);
* those labels. Therefore, extending the non-empty backend file
* is disabled as well.
*/
- if (!file_size && ftruncate(fd, memory)) {
+ if (truncate && ftruncate(fd, memory)) {
perror("ftruncate");
}
if (area == MAP_FAILED) {
error_setg_errno(errp, errno,
"unable to map backing store for guest RAM");
- goto error;
+ return NULL;
}
if (mem_prealloc) {
os_mem_prealloc(fd, area, memory, smp_cpus, errp);
if (errp && *errp) {
- goto error;
+ qemu_ram_munmap(area, memory);
+ return NULL;
}
}
block->fd = fd;
return area;
-
-error:
- if (area != MAP_FAILED) {
- qemu_ram_munmap(area, memory);
- }
- if (unlink_on_error) {
- unlink(path);
- }
- if (fd != -1) {
- close(fd);
- }
- return NULL;
}
#endif
}
#ifdef __linux__
-RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
- bool share, const char *mem_path,
- Error **errp)
+RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
+ bool share, int fd,
+ Error **errp)
{
RAMBlock *new_block;
Error *local_err = NULL;
+ int64_t file_size;
if (xen_enabled()) {
error_setg(errp, "-mem-path not supported with Xen");
return NULL;
}
+ if (kvm_enabled() && !kvm_has_sync_mmu()) {
+ error_setg(errp,
+ "host lacks kvm mmu notifiers, -mem-path unsupported");
+ return NULL;
+ }
+
if (phys_mem_alloc != qemu_anon_ram_alloc) {
/*
* file_ram_alloc() needs to allocate just like
}
size = HOST_PAGE_ALIGN(size);
+ file_size = get_file_size(fd);
+ if (file_size > 0 && file_size < size) {
+ error_setg(errp, "backing store %s size 0x%" PRIx64
+ " does not match 'size' option 0x" RAM_ADDR_FMT,
+ mem_path, file_size, size);
+ return NULL;
+ }
+
new_block = g_malloc0(sizeof(*new_block));
new_block->mr = mr;
new_block->used_length = size;
new_block->max_length = size;
new_block->flags = share ? RAM_SHARED : 0;
- new_block->host = file_ram_alloc(new_block, size,
- mem_path, errp);
+ new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp);
if (!new_block->host) {
g_free(new_block);
return NULL;
return NULL;
}
return new_block;
+
+}
+
+
+RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
+ bool share, const char *mem_path,
+ Error **errp)
+{
+ int fd;
+ bool created;
+ RAMBlock *block;
+
+ fd = file_ram_open(mem_path, memory_region_name(mr), &created, errp);
+ if (fd < 0) {
+ return NULL;
+ }
+
+ block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp);
+ if (!block) {
+ if (created) {
+ unlink(mem_path);
+ }
+ close(fd);
+ return NULL;
+ }
+
+ return block;
}
#endif
{
bool locked = false;
+ assert(tcg_enabled());
if (!cpu_physical_memory_get_dirty_flag(ram_addr, DIRTY_MEMORY_CODE)) {
locked = true;
tb_lock();
CPUWatchpoint *wp;
uint32_t cpu_flags;
+ assert(tcg_enabled());
if (cpu->watchpoint_hit) {
/* We re-entered the check after replacing the TB. Now raise
* the debug interrupt so that is will trigger after the
cpu_physical_memory_range_includes_clean(addr, length, dirty_log_mask);
}
if (dirty_log_mask & (1 << DIRTY_MEMORY_CODE)) {
+ assert(tcg_enabled());
tb_lock();
tb_invalidate_phys_range(addr, addr + length);
tb_unlock();
}
#endif
+
+void page_size_init(void)
+{
+ /* NOTE: we can always suppose that qemu_host_page_size >=
+ TARGET_PAGE_SIZE */
+ qemu_real_host_page_size = getpagesize();
+ qemu_real_host_page_mask = -(intptr_t)qemu_real_host_page_size;
+ if (qemu_host_page_size == 0) {
+ qemu_host_page_size = qemu_real_host_page_size;
+ }
+ if (qemu_host_page_size < TARGET_PAGE_SIZE) {
+ qemu_host_page_size = TARGET_PAGE_SIZE;
+ }
+ qemu_host_page_mask = -(intptr_t)qemu_host_page_size;
+}
projects / qemu.git / blobdiff