linux-kernel - Re: [PATCH v9 30/44] arm64: kasan: Allow enabling in-kernel MTE

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Message-ID: <0ab166e6-9087-6d3b-fc66-ce9909721a86@arm.com>
Date:   Fri, 13 Nov 2020 12:04:47 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Andrey Konovalov <andreyknvl@...gle.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@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 30/44] arm64: kasan: Allow enabling in-kernel MTE



On 11/13/20 12:00 PM, Catalin Marinas wrote:
> On Fri, Nov 13, 2020 at 11:17:15AM +0000, Vincenzo Frascino wrote:
>> On 11/12/20 9:43 AM, Catalin Marinas wrote:
>>> On Tue, Nov 10, 2020 at 11:10:27PM +0100, Andrey Konovalov wrote:
>>>> From: Vincenzo Frascino <vincenzo.frascino@....com>
>>>>
>>>> Hardware tag-based KASAN relies on Memory Tagging Extension (MTE)
>>>> feature and requires it to be enabled. MTE supports
>>>>
>>>> This patch adds a new mte_init_tags() helper, that enables MTE in
>>>> Synchronous mode in EL1 and is intended to be called from KASAN runtime
>>>> during initialization.
>>>
>>> There's no mte_init_tags() in this function.
>>
>> During the rework, I realized that the description of mte_init_tags() in this
>> patch refers to mte_enable_kernel(). In fact the only thing that mte_init_tags()
>> does is to configure the GCR_EL1 register, hence my preference would be to keep
>> all the code that deals with such a register in one patch.
> 
> Fine by me as long as the commit text is consistent with the diff.
> 

Done already, it will be in the next series. Thank you for the quick turnaround.

-- 
Regards,
Vincenzo