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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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9
exec.c
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@ -909,14 +909,15 @@ static int subpage_register (subpage_t *mmio, uint32_t start, uint32_t end,
uint16_t section);
static subpage_t *subpage_init(AddressSpace *as, hwaddr base);
static void *(*phys_mem_alloc)(size_t size) = qemu_anon_ram_alloc;
static void *(*phys_mem_alloc)(size_t size, uint64_t *align) =
qemu_anon_ram_alloc;
/*
* Set a custom physical guest memory alloator.
* Accelerators with unusual needs may need this. Hopefully, we can
* get rid of it eventually.
*/
void phys_mem_set_alloc(void *(*alloc)(size_t))
void phys_mem_set_alloc(void *(*alloc)(size_t, uint64_t *align))
{
phys_mem_alloc = alloc;
}
@ -1098,6 +1099,7 @@ static void *file_ram_alloc(RAMBlock *block,
error_propagate(errp, local_err);
goto error;
}
block->mr->align = hpagesize;
if (memory < hpagesize) {
error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to "
@ -1309,7 +1311,8 @@ static ram_addr_t ram_block_add(RAMBlock *new_block, Error **errp)
if (xen_enabled()) {
xen_ram_alloc(new_block->offset, new_block->length, new_block->mr);
} else {
new_block->host = phys_mem_alloc(new_block->length);
new_block->host = phys_mem_alloc(new_block->length,
&new_block->mr->align);
if (!new_block->host) {
error_setg_errno(errp, errno,
"cannot set up guest memory '%s'",