diff mbox series

[v3,2/3] KVM: x86/mmu: Fix pf_fixed count in tdp_mmu_map_handle_target_level()

Message ID 2ea8b7f5d4f03c99b32bc56fc982e1e4e3d3fc6b.1623717884.git.kai.huang@intel.com (mailing list archive)
State New, archived
Headers show
Series TDP MMU: several minor fixes or improvements | expand

Commit Message

Kai Huang June 15, 2021, 12:57 a.m. UTC
Currently pf_fixed is not increased when prefault is true.  This is not
correct, since prefault here really means "async page fault completed".
In that case, the original page fault from the guest was morphed into as
async page fault and pf_fixed was not increased.  So when prefault
indicates async page fault is completed, pf_fixed should be increased.

Additionally, currently pf_fixed is also increased even when page fault
is spurious, while legacy MMU increases pf_fixed when page fault returns
RET_PF_EMULATE or RET_PF_FIXED.

To fix above two issues, change to increase pf_fixed when return value
is not RET_PF_SPURIOUS (RET_PF_RETRY has already been ruled out by
reaching here).

More information:
https://lore.kernel.org/kvm/cover.1620200410.git.kai.huang@intel.com/T/#mbb5f8083e58a2cd262231512b9211cbe70fc3bd5

Fixes: bb18842e2111 ("kvm: x86/mmu: Add TDP MMU PF handler")
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Kai Huang <kai.huang@intel.com>
---
 arch/x86/kvm/mmu/tdp_mmu.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 6c9c6917925a..efb7503ed4d5 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -951,7 +951,11 @@  static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, int write,
 				       rcu_dereference(iter->sptep));
 	}
 
-	if (!prefault)
+	/*
+	 * Increase pf_fixed in both RET_PF_EMULATE and RET_PF_FIXED to be
+	 * consistent with legacy MMU behavior.
+	 */
+	if (ret != RET_PF_SPURIOUS)
 		vcpu->stat.pf_fixed++;
 
 	return ret;