linux-kernel - Re: [PATCH v3] doc: kvm: Fix return description of KVM_SET

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Date:   Tue, 10 Sep 2019 19:14:07 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] doc: kvm: Fix return description of KVM_SET_MSRS

On 05/09/19 02:57, Xiaoyao Li wrote:
> Userspace can use ioctl KVM_SET_MSRS to update a set of MSRs of guest.
> This ioctl set specified MSRs one by one. If it fails to set an MSR,
> e.g., due to setting reserved bits, the MSR is not supported/emulated by
> KVM, etc..., it stops processing the MSR list and returns the number of
> MSRs have been set successfully.
> 
> Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>

Queued, thanks.

Paolo

> ---
> v3:
>   refine the description based on Sean's comment.  
> 
> v2:
>   elaborate the changelog and description of ioctl KVM_SET_MSRS based on
>   Sean's comments.
> ---
>  Documentation/virt/kvm/api.txt | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/virt/kvm/api.txt b/Documentation/virt/kvm/api.txt
> index 2d067767b617..24541e52e96e 100644
> --- a/Documentation/virt/kvm/api.txt
> +++ b/Documentation/virt/kvm/api.txt
> @@ -586,7 +586,7 @@ Capability: basic
>  Architectures: x86
>  Type: vcpu ioctl
>  Parameters: struct kvm_msrs (in)
> -Returns: 0 on success, -1 on error
> +Returns: number of msrs successfully set (see below), -1 on error
>  
>  Writes model-specific registers to the vcpu.  See KVM_GET_MSRS for the
>  data structures.
> @@ -595,6 +595,11 @@ Application code should set the 'nmsrs' member (which indicates the
>  size of the entries array), and the 'index' and 'data' members of each
>  array entry.
>  
> +It tries to set the MSRs in array entries[] one by one. If setting an MSR
> +fails, e.g., due to setting reserved bits, the MSR isn't supported/emulated
> +by KVM, etc..., it stops processing the MSR list and returns the number of
> +MSRs that have been set successfully.
> +
>  
>  4.20 KVM_SET_CPUID
>  
>