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-rw-r--r--arch/x86/kvm/mmu.c20
1 files changed, 7 insertions, 13 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 146f295..d43867c 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -4481,9 +4481,11 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
pfn = spte_to_pfn(*sptep);
/*
- * Only EPT supported for now; otherwise, one would need to
- * find out efficiently whether the guest page tables are
- * also using huge pages.
+ * We cannot do huge page mapping for indirect shadow pages,
+ * which are found on the last rmap (level = 1) when not using
+ * tdp; such shadow pages are synced with the page table in
+ * the guest, and the guest page table is using 4K page size
+ * mapping if the indirect sp has level = 1.
*/
if (sp->role.direct &&
!kvm_is_reserved_pfn(pfn) &&
@@ -4504,19 +4506,12 @@ void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm,
bool flush = false;
unsigned long *rmapp;
unsigned long last_index, index;
- gfn_t gfn_start, gfn_end;
spin_lock(&kvm->mmu_lock);
- gfn_start = memslot->base_gfn;
- gfn_end = memslot->base_gfn + memslot->npages - 1;
-
- if (gfn_start >= gfn_end)
- goto out;
-
rmapp = memslot->arch.rmap[0];
- last_index = gfn_to_index(gfn_end, memslot->base_gfn,
- PT_PAGE_TABLE_LEVEL);
+ last_index = gfn_to_index(memslot->base_gfn + memslot->npages - 1,
+ memslot->base_gfn, PT_PAGE_TABLE_LEVEL);
for (index = 0; index <= last_index; ++index, ++rmapp) {
if (*rmapp)
@@ -4534,7 +4529,6 @@ void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm,
if (flush)
kvm_flush_remote_tlbs(kvm);
-out:
spin_unlock(&kvm->mmu_lock);
}
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