diff options
| author | Wanpeng Li <wanpengli@tencent.com> | 2018-02-09 06:15:25 -0800 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2018-03-12 15:57:39 -0300 |
| commit | be7773268d98176489483a315d3e2323cb0615b9 (patch) | |
| tree | 04b4bf0a8a714996bac98ac8ec5af7f52edce048 /target/i386/kvm.c | |
| parent | b16a54da0696efc5d91b6c3597a37a317abb5de7 (diff) | |
target-i386: add KVM_HINTS_DEDICATED performance hint
Add KVM_HINTS_DEDICATED performance hint, guest checks this feature bit
to determine if they run on dedicated vCPUs, allowing optimizations such
as usage of qspinlocks.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1518185725-69559-1-git-send-email-wanpengli@tencent.com>
[ehabkost: Renamed property to kvm-hint-dedicated]
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'target/i386/kvm.c')
| -rw-r--r-- | target/i386/kvm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/target/i386/kvm.c b/target/i386/kvm.c index ad4b159b28..44ee524188 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -383,6 +383,9 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function, if (!kvm_irqchip_in_kernel()) { ret &= ~(1U << KVM_FEATURE_PV_UNHALT); } + } else if (function == KVM_CPUID_FEATURES && reg == R_EDX) { + ret |= KVM_HINTS_DEDICATED; + found = 1; } /* fallback for older kernels */ @@ -801,6 +804,7 @@ int kvm_arch_init_vcpu(CPUState *cs) c = &cpuid_data.entries[cpuid_i++]; c->function = KVM_CPUID_FEATURES | kvm_base; c->eax = env->features[FEAT_KVM]; + c->edx = env->features[FEAT_KVM_HINTS]; } cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused); |