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Commit 6e3e243c authored by Andrea Arcangeli's avatar Andrea Arcangeli Committed by Avi Kivity
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KVM: MMU: fix mmu notifier invalidate handler for huge spte 



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

Signed-off-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
Reviewed-by: default avatarReviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent c19b8bd6

arch/x86/kvm/mmu.c

+6 −2
Original line number Diff line number Diff line
@@ -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);