Re: [libvirt] [Qemu-devel] [PATCH qom-cpu 8/9] target-i386: Introduce X86CPU.filtered_features field

This field will contain the feature bits that were filtered out because of missing host support.

Signed-off-by: Eduardo Habkost <ehabkost(a)redhat.com&gt; --- target-i386/cpu-qom.h | 3 +++ target-i386/cpu.c | 9 ++++++--- 2 files changed, 9 insertions(+), 3 deletions(-)

+++ b/target-i386/cpu.c @@ -1642,9 +1642,12 @@ static void filter_features_for_kvm(X86CPU *cpu) for (w = 0; w < FEATURE_WORDS; w++) { FeatureWordInfo *wi = &feature_word_info[w]; - env->features[w] &= kvm_arch_get_supported_cpuid(s, wi->cpuid_eax, - wi->cpuid_ecx, - wi->cpuid_reg); + uint32_t host_feat = kvm_arch_get_supported_cpuid(s, wi->cpuid_eax, + wi->cpuid_ecx, + wi->cpuid_reg);

+ uint32_t requested_features = env->features[w]; + env->features[w] &= host_feat; + cpu->filtered_features[w] = requested_features & ~env->features[w]; } } #endif