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KVM: selftests: sev_init2_tests: Derive SEV availability from KVM

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The test asserted that the X86_FEATURE_SEV CPUID bit exactly matches
whether KVM offers KVM_X86_SEV_VM.  That is not an invariant: when all
SEV ASIDs are assigned to SEV-SNP, KVM does not offer the SEV VM type
even though CPUID reports SEV, so the test aborts on an SNP-only host.

Derive SEV availability from KVM_CAP_VM_TYPES (as already done for SEV-ES
and SNP), assert only the one-way implication that a type offered by KVM
is also reported in CPUID, and TEST_REQUIRE() the SEV VM type so the test
skips cleanly when it is unavailable.

Reviewed-by: Tycho Andersen (AMD) <tycho@kernel.org>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-ID: <5d3c345113748f39b7982e365d241abaf3e11086.1784545391.git.dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Woodhouse 2026-07-20 12:03:03 +01:00 committed by Paolo Bonzini
parent cd76ec58be
commit f148dd411d
1 changed files with 11 additions and 5 deletions
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16
tools/testing/selftests/kvm/x86/sev_init2_tests.c
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@ -130,12 +130,18 @@ int main(int argc, char *argv[])
KVM_X86_SEV_VMSA_FEATURES,
&supported_vmsa_features);
have_sev = kvm_cpu_has(X86_FEATURE_SEV);
TEST_ASSERT(have_sev == !!(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SEV_VM)),
"sev: KVM_CAP_VM_TYPES (%x) does not match cpuid (checking %x)",
kvm_check_cap(KVM_CAP_VM_TYPES), 1 << KVM_X86_SEV_VM);
/*
* Whether a VM type is available depends on KVM, not just CPUID: e.g.
* when all SEV ASIDs are assigned to SEV-SNP, KVM does not offer the
* SEV VM type even though X86_FEATURE_SEV is set. Derive availability
* from KVM_CAP_VM_TYPES and only assert the one-way implication that a
* type offered by KVM must also be reported in CPUID.
*/
have_sev = kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SEV_VM);
TEST_ASSERT(!have_sev || kvm_cpu_has(X86_FEATURE_SEV),
"sev: SEV_VM supported without SEV in CPUID");
TEST_REQUIRE(kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SEV_VM));
TEST_REQUIRE(have_sev);
have_sev_es = kvm_check_cap(KVM_CAP_VM_TYPES) & BIT(KVM_X86_SEV_ES_VM);
TEST_ASSERT(!have_sev_es || kvm_cpu_has(X86_FEATURE_SEV_ES),