linux-kernel - Re: [RFC PATCH 0/2] MTE support for KVM guest

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Message-ID: <CAFEAcA8Myn_QEjfk4Ka604PDAUAWXs6dLUY5bEQ98C__oMsmhA@mail.gmail.com>
Date:   Tue, 23 Jun 2020 19:05:07 +0100
From:   Peter Maydell <peter.maydell@...aro.org>
To:     Steven Price <steven.price@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        Dave Martin <Dave.Martin@....com>,
        lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        kvmarm@...ts.cs.columbia.edu,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 0/2] MTE support for KVM guest

On Wed, 17 Jun 2020 at 13:39, Steven Price <steven.price@....com> wrote:
>
> These patches add support to KVM to enable MTE within a guest. It is
> based on Catalin's v4 MTE user space series[1].
>
> [1] http://lkml.kernel.org/r/20200515171612.1020-1-catalin.marinas%40arm.com
>
> Posting as an RFC as I'd like feedback on the approach taken.

What's your plan for handling tags across VM migration?
Will the kernel expose the tag ram to userspace so we
can copy it from the source machine to the destination
at the same time as we copy the actual ram contents ?

thanks
-- PMM