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[2/2] KVM: x86: Explicitly set eax and ebx to 0 when X86_FEATURE_PERFMON_V2 cannot be exposed to guest

Message ID 20250304082314.472202-3-xiaoyao.li@intel.com (mailing list archive)
State New
Headers show
Series KVM: x86: Cleanup and fix for reporting CPUID leaf 0x80000022 | expand

Commit Message

Xiaoyao Li March 4, 2025, 8:23 a.m. UTC 
It wrongly exposes the host ebx value of leaf 0x80000022 to userspace
when it's supposed to return 0.

Fixes: 94cdeebd8211 ("KVM: x86/cpuid: Add AMD CPUID ExtPerfMonAndDbg leaf 0x80000022")
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index f9a9175e3fe8..5e4d4934c0d3 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -1767,7 +1767,7 @@  static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 
 		entry->ecx = entry->edx = 0;
 		if (!enable_pmu || !kvm_cpu_cap_has(X86_FEATURE_PERFMON_V2)) {
-			entry->eax = entry->ebx;
+			entry->eax = entry->ebx = 0;
 			break;
 		}