linux-kernel - [PATCH v5 4/9] KVM: selftests: Add VMGEXIT helper

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Message-ID: <20250123220100.339867-5-prsampat@amd.com>
Date: Thu, 23 Jan 2025 16:00:55 -0600
From: "Pratik R. Sampat" <prsampat@....com>
To: <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <kvm@...r.kernel.org>,
	<linux-crypto@...r.kernel.org>, <linux-kselftest@...r.kernel.org>
CC: <seanjc@...gle.com>, <pbonzini@...hat.com>, <thomas.lendacky@....com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>, <shuah@...nel.org>, <pgonda@...gle.com>,
	<ashish.kalra@....com>, <nikunj@....com>, <michael.roth@....com>,
	<sraithal@....com>, <prsampat@....com>
Subject: [PATCH v5 4/9] KVM: selftests: Add VMGEXIT helper

Abstract rep vmmcall coded into the VMGEXIT helper for the sev
library.

No functional change intended.

Signed-off-by: Pratik R. Sampat <prsampat@....com>
---
 tools/testing/selftests/kvm/include/x86/sev.h    | 2 ++
 tools/testing/selftests/kvm/x86/sev_smoke_test.c | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/include/x86/sev.h b/tools/testing/selftests/kvm/include/x86/sev.h
index 82c11c81a956..e7df5d0987f6 100644
--- a/tools/testing/selftests/kvm/include/x86/sev.h
+++ b/tools/testing/selftests/kvm/include/x86/sev.h
@@ -27,6 +27,8 @@ enum sev_guest_state {
 
 #define GHCB_MSR_TERM_REQ	0x100
 
+#define VMGEXIT()		{ __asm__ __volatile__("rep; vmmcall"); }
+
 void sev_vm_launch(struct kvm_vm *vm, uint32_t policy);
 void sev_vm_launch_measure(struct kvm_vm *vm, uint8_t *measurement);
 void sev_vm_launch_finish(struct kvm_vm *vm);
diff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
index a1a688e75266..38f647fe55d2 100644
--- a/tools/testing/selftests/kvm/x86/sev_smoke_test.c
+++ b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
@@ -27,7 +27,7 @@ static void guest_sev_es_code(void)
 	 * force "termination" to signal "done" via the GHCB MSR protocol.
 	 */
 	wrmsr(MSR_AMD64_SEV_ES_GHCB, GHCB_MSR_TERM_REQ);
-	__asm__ __volatile__("rep; vmmcall");
+	VMGEXIT();
 }
 
 static void guest_sev_code(void)
-- 
2.43.0