linux-kernel - Re: [RFC PATCH V2] kvm: arm64: export memory error recovery capability to user space

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Date:   Mon, 13 May 2019 18:20:14 +0800
From:   gengdongjiu <gengdongjiu@...wei.com>
To:     Peter Maydell <peter.maydell@...aro.org>
CC:     Christoffer Dall <christoffer.dall@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        James Morse <james.morse@....com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        kvm-devel <kvm@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>,
        "Zheng Xiang" <zhengxiang9@...wei.com>
Subject: Re: [RFC PATCH V2] kvm: arm64: export memory error recovery
 capability to user space

On 2019/5/13 17:44, Peter Maydell wrote:
> On Mon, 13 May 2019 at 07:32, Dongjiu Geng <gengdongjiu@...wei.com> wrote:
>>
>> When user space do memory recovery, it will check whether KVM and
>> guest support the error recovery, only when both of them support,
>> user space will do the error recovery. This patch exports this
>> capability of KVM to user space.
>>
>> Cc: Peter Maydell <peter.maydell@...aro.org>
>> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
>> ---
>> v1->v2:
>> 1. check whether host support memory failure instead of RAS capability
>>    https://patchwork.kernel.org/patch/10730827/
>>
>> v1:
>> 1. User space needs to check this capability of host is suggested by Peter[1],
>> this patch as RFC tag because user space patches are still under review,
>> so this kernel patch is firstly sent out for review.
>>
>> [1]: https://patchwork.codeaurora.org/patch/652261/
>> ---
> 
> I thought the conclusion of the thread on the v1 patch was that
> userspace doesn't need to specifically ask the host kernel if
> it has support for this -- if it does not, then the host kernel
> will just never deliver userspace any SIGBUS with MCEERR code,
> which is fine. Or am I still confused?

thanks Peter's quick reply.
yes, I think so, if it does not support,  then the host kernel
will just never deliver userspace any SIGBUS with MCEERR code.

so maybe we do not need this patch.

> 
> thanks
> -- PMM
> .
>