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exec: split qemu_ram_alloc_from_file() 

Add qemu_ram_alloc_from_fd(), which can be use to allocate ramblock from
fd only.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170602141229.15326-4-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-06-02 18:12:23 +04:00 committed by Paolo Bonzini
parent 8d37b030fe
commit 38b3362dd1
2 changed files with 33 additions and 15 deletions
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45
exec.c
View File

@ -1914,14 +1914,12 @@ static void ram_block_add(RAMBlock *new_block, Error **errp)
}
#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;
int fd;
bool created;
int64_t file_size;
if (xen_enabled()) {
@ -1946,18 +1944,12 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
return NULL;
}
fd = file_ram_open(mem_path, memory_region_name(mr), &created, errp);
if (fd < 0) {
return NULL;
}
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);
close(fd);
return NULL;
}
@ -1968,10 +1960,6 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
new_block->flags = share ? RAM_SHARED : 0;
new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp);
if (!new_block->host) {
if (created) {
unlink(mem_path);
}
close(fd);
g_free(new_block);
return NULL;
}
@ -1983,6 +1971,33 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
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

3
include/exec/ram_addr.h
View File

@ -65,6 +65,9 @@ unsigned long last_ram_page(void);
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 *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
MemoryRegion *mr, Error **errp);
RAMBlock *qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr, Error **errp);