On 4/17/2025 3:22 AM, Dongli Zhang wrote: > Currently, AMD PMU support isn't determined based on CPUID, that is, the > "-pmu" option does not fully disable KVM AMD PMU virtualization. > > To minimize AMD PMU features, remove PERFCORE when "-pmu" is configured. > > To completely disable AMD PMU virtualization will be implemented via > KVM_CAP_PMU_CAPABILITY in upcoming patches. > > As a reminder, neither CPUID_EXT3_PERFCORE nor > CPUID_8000_0022_EAX_PERFMON_V2 is removed from env->features[] when "-pmu" > is configured. Developers should query whether they are supported via > cpu_x86_cpuid() rather than relying on env->features[] in future patches. > > Suggested-by: Zhao Liu <zhao1.liu@xxxxxxxxx> > Signed-off-by: Dongli Zhang <dongli.zhang@xxxxxxxxxx> > Reviewed-by: Zhao Liu <zhao1.liu@xxxxxxxxx> > --- > Changed since v2: > - No need to check "kvm_enabled() && IS_AMD_CPU(env)". > > target/i386/cpu.c | 4 ++++ > 1 file changed, 4 insertions(+) > Reviewed-by: Sandipan Das <sandipan.das@xxxxxxx>
