diff options
| -rw-r--r-- | arch/x86/kvm/x86.c | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3d72fc06705..d51eed239b4 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3930,6 +3930,29 @@ static int handle_emulation_failure(struct kvm_vcpu *vcpu) return EMULATE_FAIL; } +static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva) +{ + gpa_t gpa; + + /* + * if emulation was due to access to shadowed page table + * and it failed try to unshadow page and re-entetr the + * guest to let CPU execute the instruction. + */ + if (kvm_mmu_unprotect_page_virt(vcpu, gva)) + return true; + + gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL); + + if (gpa == UNMAPPED_GVA) + return true; /* let cpu generate fault */ + + if (!kvm_is_error_hva(gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT))) + return true; + + return false; +} + int emulate_instruction(struct kvm_vcpu *vcpu, unsigned long cr2, u16 error_code, @@ -3998,7 +4021,7 @@ int emulate_instruction(struct kvm_vcpu *vcpu, ++vcpu->stat.insn_emulation; if (r) { - if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) + if (reexecute_instruction(vcpu, cr2)) return EMULATE_DONE; if (emulation_type & EMULTYPE_SKIP) return EMULATE_FAIL; @@ -4019,12 +4042,7 @@ restart: r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops); if (r) { /* emulation failed */ - /* - * if emulation was due to access to shadowed page table - * and it failed try to unshadow page and re-entetr the - * guest to let CPU execute the instruction. - */ - if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) + if (reexecute_instruction(vcpu, cr2)) return EMULATE_DONE; return handle_emulation_failure(vcpu); |