Re: [PATCH RFC 5/6] KVM: x86: announce KVM_FEATURE_ASYNC_PF_INT

[Peter Zijlstra <peterz@infradead.org>]

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@redhat.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.
> +