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KVM: MMU: fix mmu notifier invalidate handler for huge spte

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The index wasn't calculated correctly (off by one) for huge spte so KVM guest
was unstable with transparent hugepages.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reviewed-by: Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Andrea Arcangeli 2010-07-16 11:52:55 +02:00 committed by Avi Kivity
parent c19b8bd60e
commit 6e3e243c3b
1 changed files with 6 additions and 2 deletions
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8
arch/x86/kvm/mmu.c
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@ -850,8 +850,12 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
ret = handler(kvm, &memslot->rmap[gfn_offset], data);
for (j = 0; j < KVM_NR_PAGE_SIZES - 1; ++j) {
int idx = gfn_offset;
idx /= KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL + j);
unsigned long idx;
int sh;
sh = KVM_HPAGE_GFN_SHIFT(PT_DIRECTORY_LEVEL+j);
idx = ((memslot->base_gfn+gfn_offset) >> sh) -
(memslot->base_gfn >> sh);
ret |= handler(kvm,
&memslot->lpage_info[j][idx].rmap_pde,
data);