Commit ada014f5 authored by Pratik R. Sampat's avatar Pratik R. Sampat Committed by Sean Christopherson
Browse files

KVM: selftests: Add a basic SEV-SNP smoke test 



Extend sev_smoke_test to also run a minimal SEV-SNP smoke test that
initializes and sets up private memory regions required to run a simple
SEV-SNP guest.

Similar to its SEV-ES smoke test counterpart, this also does not
support GHCB and ucall yet and uses the GHCB MSR protocol to trigger an
exit of the type KVM_EXIT_SYSTEM_EVENT.

Signed-off-by: default avatarPratik R. Sampat <prsampat@amd.com>
Link: https://lore.kernel.org/r/20250305230000.231025-11-prsampat@amd.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent a5d55f78

tools/testing/selftests/kvm/x86/sev_smoke_test.c

+23 −2
Original line number Diff line number Diff line
@@ -16,6 +16,18 @@ 


#define XFEATURE_MASK_X87_AVX (XFEATURE_MASK_FP | XFEATURE_MASK_SSE | XFEATURE_MASK_YMM)



static void guest_snp_code(void)

{

	uint64_t sev_msr = rdmsr(MSR_AMD64_SEV);



	GUEST_ASSERT(sev_msr & MSR_AMD64_SEV_ENABLED);

	GUEST_ASSERT(sev_msr & MSR_AMD64_SEV_ES_ENABLED);

	GUEST_ASSERT(sev_msr & MSR_AMD64_SEV_SNP_ENABLED);



	wrmsr(MSR_AMD64_SEV_ES_GHCB, GHCB_MSR_TERM_REQ);

	vmgexit();

}



static void guest_sev_es_code(void)

{

	/* TODO: Check CPUID after GHCB-based hypercall support is added. */
@@ -180,6 +192,9 @@ static void test_sev_smoke(void *guest, uint32_t type, uint64_t policy) 
{

	const u64 xf_mask = XFEATURE_MASK_X87_AVX;



	if (type == KVM_X86_SNP_VM)

		test_sev(guest, type, policy | SNP_POLICY_DBG);

	else

		test_sev(guest, type, policy | SEV_POLICY_NO_DBG);

	test_sev(guest, type, policy);
@@ -191,6 +206,9 @@ static void test_sev_smoke(void *guest, uint32_t type, uint64_t policy) 
	if (kvm_has_cap(KVM_CAP_XCRS) &&

	    (xgetbv(0) & kvm_cpu_supported_xcr0() & xf_mask) == xf_mask) {

		test_sync_vmsa(type, policy);

		if (type == KVM_X86_SNP_VM)

			test_sync_vmsa(type, policy | SNP_POLICY_DBG);

		else

			test_sync_vmsa(type, policy | SEV_POLICY_NO_DBG);

	}

}
@@ -204,5 +222,8 @@ int main(int argc, char *argv[]) 
	if (kvm_cpu_has(X86_FEATURE_SEV_ES))

		test_sev_smoke(guest_sev_es_code, KVM_X86_SEV_ES_VM, SEV_POLICY_ES);



	if (kvm_cpu_has(X86_FEATURE_SEV_SNP))

		test_sev_smoke(guest_snp_code, KVM_X86_SNP_VM, snp_default_policy());



	return 0;

}