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x86/kvm: Don't use PV TLB/yield when mwait is advertised

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MWAIT is advertised in host is not overcommitted scenario, however, PV
TLB/sched yield should be enabled in host overcommitted scenario. Let's
add the MWAIT checking when enabling PV TLB/sched yield.

Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Message-Id: <1645777780-2581-1-git-send-email-wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li
2022-02-25 00:29:40 -08:00
committed by Paolo Bonzini
parent ece32a75f0
commit 40cd58dbf1
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kernel/kvm.c
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@@ -463,6 +463,7 @@ static bool pv_tlb_flush_supported(void)
return (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
kvm_para_has_feature(KVM_FEATURE_STEAL_TIME) &&
!boot_cpu_has(X86_FEATURE_MWAIT) &&
(num_possible_cpus() != 1));
}
@@ -477,6 +478,7 @@ static bool pv_sched_yield_supported(void)
return (kvm_para_has_feature(KVM_FEATURE_PV_SCHED_YIELD) &&
!kvm_para_has_hint(KVM_HINTS_REALTIME) &&
kvm_para_has_feature(KVM_FEATURE_STEAL_TIME) &&
!boot_cpu_has(X86_FEATURE_MWAIT) &&
(num_possible_cpus() != 1));
}