From 7bd9645348ca865408b8c50491d605da1dfa05e3 Mon Sep 17 00:00:00 2001 From: David Matlack Date: Wed, 21 Sep 2022 10:35:40 -0700 Subject: [PATCH] KVM: x86/mmu: Handle error PFNs in kvm_faultin_pfn() Handle error PFNs in kvm_faultin_pfn() rather than relying on the caller to invoke handle_abnormal_pfn() after kvm_faultin_pfn(). Opportunistically rename kvm_handle_bad_page() to kvm_handle_error_pfn() to make it more consistent with is_error_pfn(). This commit moves KVM closer to being able to drop handle_abnormal_pfn(), which will reduce the amount of duplicate code in the various page fault handlers. No functional change intended. Signed-off-by: David Matlack Signed-off-by: Paolo Bonzini Message-Id: <20220921173546.2674386-5-dmatlack@google.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/mmu.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index efc540e..d8a256f 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3219,10 +3219,6 @@ static int kvm_handle_error_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, kvm_pfn_t pfn) static int handle_abnormal_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault, unsigned int access) { - /* The pfn is invalid, report the error! */ - if (unlikely(is_error_pfn(fault->pfn))) - return kvm_handle_error_pfn(vcpu, fault->gfn, fault->pfn); - if (unlikely(!fault->slot)) { gva_t gva = fault->is_tdp ? 0 : fault->addr; @@ -4252,10 +4248,19 @@ static int __kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault static int kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) { + int ret; + fault->mmu_seq = vcpu->kvm->mmu_invalidate_seq; smp_rmb(); - return __kvm_faultin_pfn(vcpu, fault); + ret = __kvm_faultin_pfn(vcpu, fault); + if (ret != RET_PF_CONTINUE) + return ret; + + if (unlikely(is_error_pfn(fault->pfn))) + return kvm_handle_error_pfn(vcpu, fault->gfn, fault->pfn); + + return RET_PF_CONTINUE; } /* -- 2.7.4