From: Vitaly Kuznetsov Date: Fri, 25 Jan 2019 11:19:34 +0000 (+0100) Subject: x86/kvm/hyper-v: recommend using eVMCS only when it is enabled X-Git-Tag: v5.0-rc4~8^2~12 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=f1adceaf01f0446e69c15b32f24ce98e3c3623f1;p=uclinux-h8%2Flinux.git x86/kvm/hyper-v: recommend using eVMCS only when it is enabled We shouldn't probably be suggesting using Enlightened VMCS when it's not enabled (not supported from guest's point of view). Hyper-V on KVM seems to be fine either way but let's be consistent. Fixes: 2bc39970e932 ("x86/kvm/hyper-v: Introduce KVM_GET_SUPPORTED_HV_CPUID") Reviewed-by: Liran Alon Signed-off-by: Vitaly Kuznetsov Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 4840f5b3c88f..4730fcaa70cf 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -1850,7 +1850,8 @@ int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, ent->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED; ent->eax |= HV_X64_CLUSTER_IPI_RECOMMENDED; ent->eax |= HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED; - ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED; + if (evmcs_ver) + ent->eax |= HV_X64_ENLIGHTENED_VMCS_RECOMMENDED; /* * Default number of spinlock retry attempts, matches