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KVM: Push rmap into kvm_arch_memory_slot

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Two reasons:
 - x86 can integrate rmap and rmap_pde and remove heuristics in
   __gfn_to_rmap().
 - Some architectures do not need rmap.

Since rmap is one of the most memory consuming stuff in KVM, ppc'd
better restrict the allocation to Book3S HV.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Takuya Yoshikawa
2012-08-01 18:03:28 +09:00
committed by Avi Kivity
parent 65fbe37c42
commit d89cc617b9
9 changed files with 49 additions and 44 deletions
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11
virt/kvm/kvm_main.c
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@@ -550,16 +550,12 @@ static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
if (!dont || free->rmap != dont->rmap)
vfree(free->rmap);
if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
kvm_destroy_dirty_bitmap(free);
kvm_arch_free_memslot(free, dont);
free->npages = 0;
free->rmap = NULL;
}
void kvm_free_physmem(struct kvm *kvm)
@@ -768,11 +764,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (npages && !old.npages) {
new.user_alloc = user_alloc;
new.userspace_addr = mem->userspace_addr;
#ifndef CONFIG_S390
new.rmap = vzalloc(npages * sizeof(*new.rmap));
if (!new.rmap)
goto out_free;
#endif /* not defined CONFIG_S390 */
if (kvm_arch_create_memslot(&new, npages))
goto out_free;
}
@@ -831,7 +823,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
/* actual memory is freed via old in kvm_free_physmem_slot below */
if (!npages) {
new.rmap = NULL;
new.dirty_bitmap = NULL;
memset(&new.arch, 0, sizeof(new.arch));
}