linux-kernel - Re: [PATCH RFC 5/6] KVM: x86: announce KVM_FEATURE_ASYNC_PF

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Message-ID: <20200429104057.GL13592@hirez.programming.kicks-ass.net>
Date:   Wed, 29 Apr 2020 12:40:57 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH RFC 5/6] KVM: x86: announce KVM_FEATURE_ASYNC_PF_INT

On Wed, Apr 29, 2020 at 11:36:33AM +0200, Vitaly Kuznetsov wrote:
> Introduce new capability to indicate that KVM supports interrupt based
> delivery of type 2 APF events (page ready notifications). This includes
> support for both MSR_KVM_ASYNC_PF2 and MSR_KVM_ASYNC_PF_ACK.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  Documentation/virt/kvm/cpuid.rst     | 6 ++++++
>  arch/x86/include/uapi/asm/kvm_para.h | 1 +
>  arch/x86/kvm/cpuid.c                 | 3 ++-
>  arch/x86/kvm/x86.c                   | 1 +
>  include/uapi/linux/kvm.h             | 1 +
>  5 files changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/virt/kvm/cpuid.rst b/Documentation/virt/kvm/cpuid.rst
> index 01b081f6e7ea..5383d68e3217 100644
> --- a/Documentation/virt/kvm/cpuid.rst
> +++ b/Documentation/virt/kvm/cpuid.rst
> @@ -86,6 +86,12 @@ KVM_FEATURE_PV_SCHED_YIELD        13          guest checks this feature bit
>                                                before using paravirtualized
>                                                sched yield.
>  
> +KVM_FEATURE_PV_SCHED_YIELD        14          guest checks this feature bit

Copy/paste fail

> +                                              before using the second async
> +                                              pf control msr 0x4b564d06 and
> +                                              async pf acknowledgment msr
> +                                              0x4b564d07.
> +