linux-kernel - Re: [PATCH] x86/kvm/hyper-v: don't announce GUEST IDLE MSR support

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Message-ID: <47cc28ee-8c33-6859-c3b8-95f6d065d0cd@redhat.com>
Date:   Sat, 26 Jan 2019 09:11:04 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Roman Kagan <rkagan@...tuozzo.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/kvm/hyper-v: don't announce GUEST IDLE MSR support

On 24/01/19 15:27, Vitaly Kuznetsov wrote:
> HV_X64_MSR_GUEST_IDLE_AVAILABLE appeared in kvm_vcpu_ioctl_get_hv_cpuid()
> by mistake: it announces support for HV_X64_MSR_GUEST_IDLE (0x400000F0)
> which we don't support in KVM (yet).
> 
> Fixes: 2bc39970e932 ("x86/kvm/hyper-v: Introduce KVM_GET_SUPPORTED_HV_CPUID")
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/kvm/hyperv.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
> index c90a5352d158..ac44a681f065 100644
> --- a/arch/x86/kvm/hyperv.c
> +++ b/arch/x86/kvm/hyperv.c
> @@ -1832,7 +1832,6 @@ int kvm_vcpu_ioctl_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
>  			ent->eax |= HV_X64_MSR_VP_INDEX_AVAILABLE;
>  			ent->eax |= HV_X64_MSR_RESET_AVAILABLE;
>  			ent->eax |= HV_MSR_REFERENCE_TSC_AVAILABLE;
> -			ent->eax |= HV_X64_MSR_GUEST_IDLE_AVAILABLE;
>  			ent->eax |= HV_X64_ACCESS_FREQUENCY_MSRS;
>  			ent->eax |= HV_X64_ACCESS_REENLIGHTENMENT;
>  
> 

Queued, thanks.

Paolo