linux-kernel - [RFC PATCH v5 098/104] KVM: TDX: Handle TDX PV report fatal error hypercall

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Date:   Fri,  4 Mar 2022 11:49:54 -0800
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>,
        Jim Mattson <jmattson@...gle.com>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [RFC PATCH v5 098/104] 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 | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 123d4322da99..4d668a6c7dc9 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1157,6 +1157,15 @@ 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. */
+	vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+	vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH;
+	vcpu->run->system_event.flags = tdvmcall_p1_read(vcpu);
+	return 0;
+}
+
 static int handle_tdvmcall(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_tdx *tdx = to_tdx(vcpu);
@@ -1180,6 +1189,8 @@ 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;
 	}
-- 
2.25.1