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From: isaku.yamahata@intel.com
To: kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: isaku.yamahata@intel.com,
	isaku.yamahata@gmail.com,
	Paolo Bonzini <pbonzini@redhat.com>,
	erdemaktas@google.com,
	Sean Christopherson <seanjc@google.com>,
	Sagi Shahar <sagis@google.com>,
	Kai Huang <kai.huang@intel.com>,
	chen.bo@intel.com,
	hang.yuan@intel.com,
	tina.zhang@intel.com
Subject: [PATCH v18 089/121] KVM: TDX: handle EXIT_REASON_OTHER_SMI
Date: Mon, 22 Jan 2024 15:54:05 -0800
Message-Id: <e4ef012fe3e595b1fcb0f6a029b7c1b7a40bafdf.1705965635.git.isaku.yamahata@intel.com>
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From: Isaku Yamahata <isaku.yamahata@intel.com>

If the control reaches EXIT_REASON_OTHER_SMI, #SMI is delivered and
handled right after returning from the TDX module to KVM nothing needs to
be done in KVM.  Continue TDX vcpu execution.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/include/uapi/asm/vmx.h | 1 +
 arch/x86/kvm/vmx/tdx.c          | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/arch/x86/include/uapi/asm/vmx.h b/arch/x86/include/uapi/asm/vmx.h
index a5faf6d88f1b..b3a30ef3efdd 100644
--- a/arch/x86/include/uapi/asm/vmx.h
+++ b/arch/x86/include/uapi/asm/vmx.h
@@ -34,6 +34,7 @@
 #define EXIT_REASON_TRIPLE_FAULT        2
 #define EXIT_REASON_INIT_SIGNAL			3
 #define EXIT_REASON_SIPI_SIGNAL         4
+#define EXIT_REASON_OTHER_SMI           6
 
 #define EXIT_REASON_INTERRUPT_WINDOW    7
 #define EXIT_REASON_NMI_WINDOW          8
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index cb4a8a8d8e1b..96f43ce288c3 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1390,6 +1390,13 @@ int tdx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t fastpath)
 	WARN_ON_ONCE(fastpath != EXIT_FASTPATH_NONE);
 
 	switch (exit_reason.basic) {
+	case EXIT_REASON_OTHER_SMI:
+		/*
+		 * If reach here, it's not a Machine Check System Management
+		 * Interrupt(MSMI).  #SMI is delivered and handled right after
+		 * SEAMRET, nothing needs to be done in KVM.
+		 */
+		return 1;
 	default:
 		break;
 	}
-- 
2.25.1