diff options
| -rw-r--r-- | arch/x86/kvm/mmu/mmu.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 733c1d5671cd..3dce38ffee76 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -2941,6 +2941,15 @@ int mmu_try_to_unsync_pages(struct kvm *kvm, const struct kvm_memory_slot *slot, return -EPERM; /* + * Only 4KiB mappings can become unsync, and KVM disallows hugepages + * when accounting 4KiB shadow pages. Upper-level gPTEs are always + * write-protected (see above), thus if the gfn can be mapped with a + * hugepage and isn't write-tracked, it can't have a shadow page. + */ + if (!lpage_info_slot(gfn, slot, PG_LEVEL_2M)->disallow_lpage) + return 0; + + /* * The page is not write-tracked, mark existing shadow pages unsync * unless KVM is synchronizing an unsync SP. In that case, KVM must * complete emulation of the guest TLB flush before allowing shadow |