linux-kernel - [PATCH v8 096/103] KVM: TDX: Handle TDX PV report fatal error hypercall

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Date:   Sun,  7 Aug 2022 15:02:21 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>
Subject: [PATCH v8 096/103] KVM: TDX: Handle TDX PV report fatal error hypercall

From: Isaku Yamahata <isaku.yamahata@...el.com>

Wire up TDX PV report fatal error hypercall to KVM_SYSTEM_EVENT_CRASH KVM
exit event.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 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 fdd0609bd01b..6131be42c721 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1192,6 +1192,24 @@ 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, returning an error to guerst 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))
@@ -1210,6 +1228,8 @@ 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 13ebb26b3be2..4ee7052542ee 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -448,6 +448,7 @@ 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 {
-- 
2.25.1