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

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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: Pratik R. Sampat <prsampat@amd.com>
Link: https://lore.kernel.org/r/20250305230000.231025-11-prsampat@amd.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Pratik R. Sampat 2025-03-05 17:00:00 -06:00 committed by Sean Christopherson
parent a5d55f783f
commit ada014f5fc
1 changed files with 23 additions and 2 deletions
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25
tools/testing/selftests/kvm/x86/sev_smoke_test.c
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@ -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. */
@ -180,7 +192,10 @@ static void test_sev_smoke(void *guest, uint32_t type, uint64_t policy)
{
const u64 xf_mask = XFEATURE_MASK_X87_AVX;
test_sev(guest, type, policy | SEV_POLICY_NO_DBG);
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);
if (type == KVM_X86_SEV_VM)
@ -191,7 +206,10 @@ 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);
test_sync_vmsa(type, policy | SEV_POLICY_NO_DBG);
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;
}