[PATCH 02/14] KVM: x86/mmu: Don't unnecessarily write-protect small pages in TDP MMU

Sean Christopherson
2021-02-13T00:52:21Z

Respect start_level when write-protect pages in the TDP MMU for dirty
logging. When the dirty bitmaps are initialized with all bits set, small
pages don't need to be write-protected as they've already been marked
dirty.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/mmu/mmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index e507568cd55d..24325bdcd387 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5500,7 +5500,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm,
flush = slot_handle_level(kvm, memslot, slot_rmap_write_protect,
start_level, KVM_MAX_HUGEPAGE_LEVEL, false);
if (is_tdp_mmu_enabled(kvm))
- flush |= kvm_tdp_mmu_wrprot_slot(kvm, memslot, PG_LEVEL_4K);
+ flush |= kvm_tdp_mmu_wrprot_slot(kvm, memslot, start_level);
write_unlock(&kvm->mmu_lock);

/*
--
2.30.0.478.g8a0d178c01-goog