On 10/30/2022 2:23 PM, isaku.yamahata@xxxxxxxxx wrote:
From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Wire up TDX PV report fatal error hypercall to KVM_SYSTEM_EVENT_CRASH KVM
exit event.
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
arch/x86/kvm/vmx/tdx.c | 20 ++++++++++++++++++++
include/uapi/linux/kvm.h | 1 +
2 files changed, 21 insertions(+)
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index e3062c245e70..16f168f4f21a 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1068,6 +1068,24 @@ static int tdx_emulate_wrmsr(struct kvm_vcpu *vcpu)
return 1;
}
+static int tdx_report_fatal_error(struct kvm_vcpu *vcpu)
+{
+ /*
+ * Exit to userspace device model for teardown.
+ * Because guest TD is already panicing
panicking
, returning an error to guerst
typo, guest
TD
+ * doesn't make sense. No argument check is done.
+ */
+
+ vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+ vcpu->run->system_event.type = KVM_SYSTEM_EVENT_TDX;
+ vcpu->run->system_event.ndata = 3;
+ vcpu->run->system_event.data[0] = TDG_VP_VMCALL_REPORT_FATAL_ERROR;
+ vcpu->run->system_event.data[1] = tdvmcall_a0_read(vcpu);
+ vcpu->run->system_event.data[2] = tdvmcall_a1_read(vcpu);
+
+ return 0;
+}
+
static int handle_tdvmcall(struct kvm_vcpu *vcpu)
{
if (tdvmcall_exit_type(vcpu))
@@ -1086,6 +1104,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
return tdx_emulate_rdmsr(vcpu);
case EXIT_REASON_MSR_WRITE:
return tdx_emulate_wrmsr(vcpu);
+ case TDG_VP_VMCALL_REPORT_FATAL_ERROR:
+ return tdx_report_fatal_error(vcpu);
default:
break;
}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 49386e4de8b8..504a8f73284b 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -478,6 +478,7 @@ struct kvm_run {
#define KVM_SYSTEM_EVENT_WAKEUP 4
#define KVM_SYSTEM_EVENT_SUSPEND 5
#define KVM_SYSTEM_EVENT_SEV_TERM 6
+#define KVM_SYSTEM_EVENT_TDX 7
__u32 type;
__u32 ndata;
union {
