From: Wanpeng Li Date: Fri, 25 Feb 2022 08:29:40 +0000 (-0800) Subject: x86/kvm: Don't use PV TLB/yield when mwait is advertised X-Git-Tag: v6.1-rc5~1893^2~5 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=40cd58dbf121e1d0c18f1bd4dd10335ae45a28fc;p=platform%2Fkernel%2Flinux-starfive.git x86/kvm: Don't use PV TLB/yield when mwait is advertised 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 Message-Id: <1645777780-2581-1-git-send-email-wanpengli@tencent.com> Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index f734e3b0cfec..491e1d9ca750 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -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)); }