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KVM: MMU: fix kvm_mmu_zap_page() and its calling path

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This patch fix:

- calculate zapped page number properly in mmu_zap_unsync_children()
- calculate freeed page number properly kvm_mmu_change_mmu_pages()
- if zapped children page it shoud restart hlist walking

KVM-Stable-Tag.
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Xiao Guangrong 2010-04-16 16:34:42 +08:00 committed by Avi Kivity
parent 78ac8b47c5
commit 77662e0028
1 changed files with 7 additions and 4 deletions
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11
arch/x86/kvm/mmu.c
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@ -1490,8 +1490,8 @@ static int mmu_zap_unsync_children(struct kvm *kvm,
for_each_sp(pages, sp, parents, i) {
kvm_mmu_zap_page(kvm, sp);
mmu_pages_clear_parents(&parents);
zapped++;
}
zapped += pages.nr;
kvm_mmu_pages_init(parent, &parents, &pages);
}
@ -1542,14 +1542,16 @@ void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages)
*/
if (used_pages > kvm_nr_mmu_pages) {
while (used_pages > kvm_nr_mmu_pages) {
while (used_pages > kvm_nr_mmu_pages &&
!list_empty(&kvm->arch.active_mmu_pages)) {
struct kvm_mmu_page *page;
page = container_of(kvm->arch.active_mmu_pages.prev,
struct kvm_mmu_page, link);
kvm_mmu_zap_page(kvm, page);
used_pages -= kvm_mmu_zap_page(kvm, page);
used_pages--;
}
kvm_nr_mmu_pages = used_pages;
kvm->arch.n_free_mmu_pages = 0;
}
else
@ -1596,7 +1598,8 @@ static void mmu_unshadow(struct kvm *kvm, gfn_t gfn)
&& !sp->role.invalid) {
pgprintk("%s: zap %lx %x\n",
__func__, gfn, sp->role.word);
kvm_mmu_zap_page(kvm, sp);
if (kvm_mmu_zap_page(kvm, sp))
nn = bucket->first;
}
}
}