linux-kernel - Re: [PATCH v16 7/7] KVM: arm64: Document MTE capability and ioctl

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Message-ID: <1273c642-d2b0-b81d-2052-1f2f0deafdae@arm.com>
Date:   Mon, 21 Jun 2021 09:18:31 +0100
From:   Steven Price <steven.price@....com>
To:     Catalin Marinas <catalin.marinas@....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 7/7] KVM: arm64: Document MTE capability and ioctl

On 18/06/2021 15:52, Catalin Marinas wrote:
> On Fri, Jun 18, 2021 at 02:28:26PM +0100, Steven Price wrote:
>> +When this capability is enabled all memory in (non-device) memslots must not
>> +used VM_SHARED, attempts to create a memslot with a VM_SHARED mmap will result
>> +in an -EINVAL return.
> 
> "must not used" doesn't sound right. Anyway, I'd remove VM_SHARED as
> that's a kernel internal and not something the VMM needs to be aware of.
> Just say something like "memslots must be mapped as shareable
> (MAP_SHARED)".

I think I meant "must not use" - and indeed memslots must *not* be
mapped as shareable. I'll update to this wording:

  When this capability is enabled all memory in memslots must be mapped as
  not-shareable (no MAP_SHARED), attempts to create a memslot with MAP_SHARED
  will result in an -EINVAL return.

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

Thanks,

Steve