linux-kernel - Re: [PATCH v17 0/6] MTE support for KVM guest

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Message-ID: <7cc69f75-a6df-0a64-873e-69e438a43bdf@arm.com>
Date:   Wed, 23 Jun 2021 15:09:00 +0100
From:   Steven Price <steven.price@....com>
To:     Marc Zyngier <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Dave Martin <Dave.Martin@....com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Juan Quintela <quintela@...hat.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Andrew Jones <drjones@...hat.com>, qemu-devel@...gnu.org,
        Thomas Gleixner <tglx@...utronix.de>,
        James Morse <james.morse@....com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH v17 0/6] MTE support for KVM guest

On 22/06/2021 15:21, Marc Zyngier wrote:
> On Mon, 21 Jun 2021 12:17:10 +0100, Steven Price wrote:
>> This series adds support for using the Arm Memory Tagging Extensions
>> (MTE) in a KVM guest.
>>
>> Changes since v16[1]:
>>
>>  - Dropped the first patch ("Handle race when synchronising tags") as
>>    it's not KVM specific and by restricting MAP_SHARED in KVM there is
>>    no longer a dependency.
>>
>> [...]
> 
> Applied to next, thanks!
> 
> [1/6] arm64: mte: Sync tags for pages where PTE is untagged
>       commit: 69e3b846d8a753f9f279f29531ca56b0f7563ad0
> [2/6] KVM: arm64: Introduce MTE VM feature
>       commit: ea7fc1bb1cd1b92b42b1d9273ce7e231d3dc9321
> [3/6] KVM: arm64: Save/restore MTE registers
>       commit: e1f358b5046479d2897f23b1d5b092687c6e7a67
> [4/6] KVM: arm64: Expose KVM_ARM_CAP_MTE
>       commit: 673638f434ee4a00319e254ade338c57618d6f7e
> [5/6] KVM: arm64: ioctl to fetch/store tags in a guest
>       commit: f0376edb1ddcab19a473b4bf1fbd5b6bbed3705b
> [6/6] KVM: arm64: Document MTE capability and ioctl
>       commit: 04c02c201d7e8149ae336ead69fb64e4e6f94bc9
> 
> I performed a number of changes in user_mem_abort(), so please
> have a look at the result. It is also pretty late in the merge
> cycle, so if anything looks amiss, I'll just drop it.

It all looks good to me - thanks for making those changes.

Steve