linux-kernel - Re: [PATCH v8 30/43] arm64: kasan: Allow enabling in-kernel MTE

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Message-ID: <090ab218-8566-772b-648f-00001413fef2@arm.com>
Date:   Thu, 5 Nov 2020 14:17:00 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 30/43] arm64: kasan: Allow enabling in-kernel MTE



On 11/5/20 12:14 PM, Andrey Konovalov wrote:
> On Thu, Nov 5, 2020 at 12:39 PM Vincenzo Frascino
> <vincenzo.frascino@....com> wrote:
>>
>> On 11/5/20 11:35 AM, Andrey Konovalov wrote:
>>> This will work. Any preference on the name of this function?
>>>
>>
>> I called it in my current iteration mte_enable(), and calling it from
>> cpu_enable_mte().
>>
>>> Alternatively we can rename mte_init_tags() to something else and let
>>> it handle both RRND and sync/async.
>>
>> This is an option but then you need to change the name of kasan_init_tags and
>> the init_tags indirection name as well. I would go for the simpler and just
>> splitting the function as per above.
>>
>> What do you think?
> 
> OK, let's split. mte_enable() as a name sounds good to me. Both
> functions will still be called one right after another from
> kasan_init_hw_tags (as it's now called) though. I think the name
> works, as it means initializing the hw_tags mode, not just the tags.
> 

I agree. When you finish with v9, could you please provide a tree with both the
sets on top similar to [1]? I would like to repeat the tests (ltp + kselftests)
and even to rebase my async code on top of it since we are aligning with the
development.

[1] https://github.com/xairy/linux/tree/up-boot-mte-v1

> Will do in v9.
> 

-- 
Regards,
Vincenzo