Let kvm_tdp_page_fault() use helper function kvm_mmu_honors_guest_mtrrs()
to decide if it needs to consult guest MTRR to check GFN range consistency.
No functional change intended.
Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Yan Zhao <yan.y.zhao@xxxxxxxxx>
---
arch/x86/kvm/mmu/mmu.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index b4f89f015c37..7f52bbe013b3 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4536,16 +4536,9 @@ int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
/*
* If the guest's MTRRs may be used to compute the "real" memtype,
* restrict the mapping level to ensure KVM uses a consistent memtype
- * across the entire mapping. If the host MTRRs are ignored by TDP
- * (shadow_memtype_mask is non-zero), and the VM has non-coherent DMA
- * (DMA doesn't snoop CPU caches), KVM's ABI is to honor the memtype
- * from the guest's MTRRs so that guest accesses to memory that is
- * DMA'd aren't cached against the guest's wishes.
- *
- * Note, KVM may still ultimately ignore guest MTRRs for certain PFNs,
- * e.g. KVM will force UC memtype for host MMIO.
+ * across the entire mapping.
*/
- if (shadow_memtype_mask && kvm_arch_has_noncoherent_dma(vcpu->kvm)) {
+ if (kvm_mmu_honors_guest_mtrrs(vcpu->kvm)) {
for ( ; fault->max_level > PG_LEVEL_4K; --fault->max_level) {
int page_num = KVM_PAGES_PER_HPAGE(fault->max_level);
gfn_t base = gfn_round_for_level(fault->gfn,
--
2.17.1
