[PATCH v6 4/9] KVM: selftests: Add VMGEXIT helper

Pratik R. Sampat
2025-02-03T22:33:17Z

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

No functional change intended.

Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Tested-by: Srikanth Aithal <sraithal@amd.com>
Signed-off-by: Pratik R. Sampat <prsampat@amd.com>
---
v5..v6:

* Collected tags from Pankaj and Srikanth.
---
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