diff options
| -rw-r--r-- | arch/x86/kvm/x86.c | 30 |
1 files changed, 9 insertions, 21 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 51d22d9de8d7..a7961f8a6429 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8924,26 +8924,6 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, return !(emulation_type & EMULTYPE_WRITE_PF_TO_SP); } -static bool retry_instruction(struct x86_emulate_ctxt *ctxt, - gpa_t cr2_or_gpa, int emulation_type) -{ - struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - - /* - * If the emulation is caused by #PF and it is non-page_table - * writing instruction, it means the VM-EXIT is caused by shadow - * page protected, we can zap the shadow page and retry this - * instruction directly. - */ - if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF)) - return false; - - if (x86_page_table_writing_insn(ctxt)) - return false; - - return kvm_mmu_unprotect_gfn_and_retry(vcpu, cr2_or_gpa); -} - static int complete_emulated_mmio(struct kvm_vcpu *vcpu); static int complete_emulated_pio(struct kvm_vcpu *vcpu); @@ -9223,7 +9203,15 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, return 1; } - if (retry_instruction(ctxt, cr2_or_gpa, emulation_type)) + /* + * If emulation was caused by a write-protection #PF on a non-page_table + * writing instruction, try to unprotect the gfn, i.e. zap shadow pages, + * and retry the instruction, as the vCPU is likely no longer using the + * gfn as a page table. + */ + if ((emulation_type & EMULTYPE_ALLOW_RETRY_PF) && + !x86_page_table_writing_insn(ctxt) && + kvm_mmu_unprotect_gfn_and_retry(vcpu, cr2_or_gpa)) return 1; /* this is needed for vmware backdoor interface to work since it |