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KVM: x86/mmu: Zap any compound page when collapsing sptes

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Zap any compound page, e.g. THP or HugeTLB pages, when zapping sptes
that can potentially be converted to huge sptes after disabling dirty
logging on the associated memslot.  Note, this approach could result in
false positives, e.g. if a random compound page is mapped into the
guest, but mapping non-huge compound pages into the guest is far from
the norm, and toggling dirty logging is not a frequent operation.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-01-08 12:24:45 -08:00 committed by Paolo Bonzini
parent 09c4453ee8
commit d32ec81bab
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/mmu/mmu.c
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@ -5951,7 +5951,7 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
*/
if (sp->role.direct && !kvm_is_reserved_pfn(pfn) &&
!kvm_is_zone_device_pfn(pfn) &&
kvm_is_transparent_hugepage(pfn)) {
PageCompound(pfn_to_page(pfn))) {
pte_list_remove(rmap_head, sptep);
if (kvm_available_flush_tlb_with_range())