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KVM: selftests: Allow kvm_cpu_has_ept() to be called on AMD CPUs

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In preparation for generalizing the nested dirty logging test, checking
if either EPT or NPT is enabled will be needed. To avoid needing to gate
the kvm_cpu_has_ept() call by the CPU type, make sure the function
returns false if VMX is not available instead of trying to read VMX-only
MSRs.

No functional change intended.

Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://patch.msgid.link/20251230230150.4150236-16-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Yosry Ahmed 2025-12-30 15:01:44 -08:00 committed by Sean Christopherson
parent 07676c04bd
commit 9cb1944f6b
1 changed files with 3 additions and 0 deletions
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3
tools/testing/selftests/kvm/lib/x86/vmx.c
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@ -377,6 +377,9 @@ bool kvm_cpu_has_ept(void)
{
uint64_t ctrl;
if (!kvm_cpu_has(X86_FEATURE_VMX))
return false;
ctrl = kvm_get_feature_msr(MSR_IA32_VMX_TRUE_PROCBASED_CTLS) >> 32;
if (!(ctrl & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS))
return false;