| Message ID | 20200129234640.8147-25-sean.j.christopherson@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: x86: Purge kvm_x86_ops->*_supported() | expand |
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index eb61a1d83598..d06fb54c9c0d 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -651,8 +651,10 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function, case 0x14: { int t, times = entry->eax; - if (!f_intel_pt) + if (!f_intel_pt) { + entry->eax = entry->ebx = entry->ecx = entry->edx = 0; break; + } for (t = 1; t <= times; ++t) { if (*nent >= maxnent)
Clear the output regs for the main CPUID 0x14 leaf (index=0) if Intel PT isn't exposed to the guest. Leaf 0x14 enumerates Intel PT capabilities and should return zeroes if PT is not supported. Incorrectly reporting PT capabilities is essentially a cosmetic error, i.e. doesn't negatively affect any known kernel, as the existence of PT itself is correctly enumerated via CPUID 0x7. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> --- arch/x86/kvm/cpuid.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)