linux-kernel - [PATCH v7 03/10] KVM: selftests: Add vmgexit helper

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Message-ID: <20250221210200.244405-4-prsampat@amd.com>
Date: Fri, 21 Feb 2025 15:01:53 -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>, <pankaj.gupta@....com>,
	<michael.roth@....com>, <sraithal@....com>, <prsampat@....com>
Subject: [PATCH v7 03/10] 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>
---
v6..v7:

* Change vmgexit macro define to an inline function (Sean)
---
 tools/testing/selftests/kvm/include/x86/sev.h    | 5 +++++
 tools/testing/selftests/kvm/x86/sev_smoke_test.c | 2 +-
 2 files changed, 6 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..3003dc837fb7 100644
--- a/tools/testing/selftests/kvm/include/x86/sev.h
+++ b/tools/testing/selftests/kvm/include/x86/sev.h
@@ -71,6 +71,11 @@ kvm_static_assert(SEV_RET_SUCCESS == 0);
 void sev_vm_init(struct kvm_vm *vm);
 void sev_es_vm_init(struct kvm_vm *vm);
 
+static inline void vmgexit(void)
+{
+	__asm__ __volatile__("rep; vmmcall");
+}
+
 static inline void sev_register_encrypted_memory(struct kvm_vm *vm,
 						 struct userspace_mem_region *region)
 {
diff --git a/tools/testing/selftests/kvm/x86/sev_smoke_test.c b/tools/testing/selftests/kvm/x86/sev_smoke_test.c
index a1a688e75266..6812b94bf5b6 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