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Add memory_region_init_ram_from_fd()

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Add a new function to initialize a RAM memory region with a file
descriptor to be mmap-ed.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170602141229.15326-5-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2017-06-02 18:12:24 +04:00 committed by Paolo Bonzini
parent 38b3362dd1
commit fea617c58b
2 changed files with 36 additions and 0 deletions
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20
include/exec/memory.h
View File

@ -456,6 +456,26 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
bool share,
const char *path,
Error **errp);
/**
* memory_region_init_ram_from_fd: Initialize RAM memory region with a
* mmap-ed backend.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: the name of the region.
* @size: size of the region.
* @share: %true if memory must be mmaped with the MAP_SHARED flag
* @fd: the fd to mmap.
* @errp: pointer to Error*, to store an error if it happens.
*/
void memory_region_init_ram_from_fd(MemoryRegion *mr,
struct Object *owner,
const char *name,
uint64_t size,
bool share,
int fd,
Error **errp);
#endif
/**

16
memory.c
View File

@ -1397,6 +1397,22 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
mr->ram_block = qemu_ram_alloc_from_file(size, mr, share, path, errp);
mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
}
void memory_region_init_ram_from_fd(MemoryRegion *mr,
struct Object *owner,
const char *name,
uint64_t size,
bool share,
int fd,
Error **errp)
{
memory_region_init(mr, owner, name, size);
mr->ram = true;
mr->terminates = true;
mr->destructor = memory_region_destructor_ram;
mr->ram_block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp);
mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
}
#endif
void memory_region_init_ram_ptr(MemoryRegion *mr,