linux-kernel - Re: [PATCH v16 3/7] KVM: arm64: Introduce MTE VM feature

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Message-ID: <20210618144707.GF16116@arm.com>
Date:   Fri, 18 Jun 2021 15:47:08 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Steven Price <steven.price@....com>
Cc:     Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Dave Martin <Dave.Martin@....com>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>, qemu-devel@...gnu.org,
        Juan Quintela <quintela@...hat.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Peter Maydell <peter.maydell@...aro.org>,
        Andrew Jones <drjones@...hat.com>
Subject: Re: [PATCH v16 3/7] KVM: arm64: Introduce MTE VM feature

On Fri, Jun 18, 2021 at 02:28:22PM +0100, Steven Price wrote:
> Add a new VM feature 'KVM_ARM_CAP_MTE' which enables memory tagging
> for a VM. This will expose the feature to the guest and automatically
> tag memory pages touched by the VM as PG_mte_tagged (and clear the tag
> storage) to ensure that the guest cannot see stale tags, and so that
> the tags are correctly saved/restored across swap.
> 
> Actually exposing the new capability to user space happens in a later
> patch.
> 
> Signed-off-by: Steven Price <steven.price@....com>

This works for me:

Reviewed-by: Catalin Marinas <catalin.marinas@....com>