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Subject[PATCH 1/2] kvm: mmu: fix catch transparent huge page backing
Date
PageTransCompound() can't guarantee the page is a transparent huge page
since it returns true for both transparent huge and hugetlbfs pages.

This patch fixes it by checking the page is also !hugetlbfs page.

Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
---
arch/x86/kvm/mmu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 146f295..2a0d77e 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4487,7 +4487,8 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
*/
if (sp->role.direct &&
!kvm_is_reserved_pfn(pfn) &&
- PageTransCompound(pfn_to_page(pfn))) {
+ !PageHuge(pfn_to_page(pfn)) &&
+ PageTransHuge(pfn_to_page(pfn))) {
drop_spte(kvm, sptep);
sptep = rmap_get_first(*rmapp, &iter);
need_tlb_flush = 1;
--
1.9.1


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