linux-kernel - [PATCH v13 097/113] KVM: TDX: Handle TDX PV report fatal error hypercall

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Message-Id: <49c90761826fbc734adc467d9d8fcce63ceb5e02.1678643052.git.isaku.yamahata@intel.com>
Date:   Sun, 12 Mar 2023 10:57:01 -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>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>
Subject: [PATCH v13 097/113] 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 exit to device model so that
it can gracefully handle it.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/tdx.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 25332290c268..0c6386fe4684 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1234,6 +1234,13 @@ 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:
+		/*
+		 * Exit to userspace device model for tear down.
+		 * Because guest TD is already panicking, returning an error to
+		 * guest TD doesn't make sense.  No argument check is done.
+		 */
+		return tdx_vp_vmcall_to_user(vcpu);
 	default:
 		break;
 	}
-- 
2.25.1