4 files changed, 7 insertions, 0 deletions

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index a9024797b21f..4c3e5b2314cb 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2800,6 +2800,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
         case EMULATE_FAIL:
                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
+                vcpu->run->internal.ndata = 0;
                 return 0;
         default:
                 BUG();
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c9cc9596e1a6..c0e66dd58a47 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3352,6 +3352,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
                         kvm_report_emulation_failure(vcpu, "emulation failure");
                         vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
                         vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
+                        vcpu->run->internal.ndata = 0;
                         ret = 0;
                         goto out;
                 }
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index ca62b8e056f9..172639e94392 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -251,6 +251,9 @@ struct kvm_run {
                 } dcr;
                 struct {
                         __u32 suberror;
+                        /* Available with KVM_CAP_INTERNAL_ERROR_DATA: */
+                        __u32 ndata;
+                        __u64 data[16];
                 } internal;
                 /* Fix the size of the union. */
                 char padding[256];
@@ -484,6 +487,7 @@ struct kvm_ioeventfd {
 #define KVM_CAP_XEN_HVM 38
 #endif
 #define KVM_CAP_ADJUST_CLOCK 39
+#define KVM_CAP_INTERNAL_ERROR_DATA 40
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index bd44fb48ac43..f92ba138007a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1653,6 +1653,7 @@ static long kvm_dev_ioctl_check_extension_generic(long arg)
 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
         case KVM_CAP_SET_BOOT_CPU_ID:
 #endif
+        case KVM_CAP_INTERNAL_ERROR_DATA:
                 return 1;
 #ifdef CONFIG_HAVE_KVM_IRQCHIP
         case KVM_CAP_IRQ_ROUTING: