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memory: expose alignment used for allocating RAM as MemoryRegion API

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introduce memory_region_get_alignment() that returns
underlying memory block alignment or 0 if it's not
relevant/implemented for backend.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2014-10-31 16:38:37 +00:00 • committed by Michael S. Tsirkin
parent 92a37a04d6
commit a2b257d621
8 changed files with 22 additions and 8 deletions
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5
util/oslib-posix.c
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@ -124,7 +124,7 @@ void *qemu_memalign(size_t alignment, size_t size)
}
/* alloc shared memory pages */
void *qemu_anon_ram_alloc(size_t size)
void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment)
{
size_t align = QEMU_VMALLOC_ALIGN;
size_t total = size + align - getpagesize();
@ -136,6 +136,9 @@ void *qemu_anon_ram_alloc(size_t size)
return NULL;
}
if (alignment) {
*alignment = align;
}
ptr += offset;
total -= offset;