From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: Andrey Konovalov <andreyknvl@google.com>
Cc: Linux ARM <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
kasan-dev <kasan-dev@googlegroups.com>,
Andrew Morton <akpm@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Dmitry Vyukov <dvyukov@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Marco Elver <elver@google.com>,
Evgenii Stepanov <eugenis@google.com>,
Branislav Rankov <Branislav.Rankov@arm.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Subject: Re: [PATCH v15 0/8] arm64: ARMv8.5-A: MTE: Add async mode support
Date: Fri, 12 Mar 2021 14:56:30 +0000 [thread overview]
Message-ID: <7e14b0ae-8aa5-549c-ef77-5f040e0d3813@arm.com> (raw)
In-Reply-To: <CAAeHK+wFT7Z5_Jg-8afdu8=mVqTwcnZY65Cgywxbd_0ui+1BEQ@mail.gmail.com>
On 3/12/21 2:50 PM, Andrey Konovalov wrote:
> On Fri, Mar 12, 2021 at 3:22 PM Vincenzo Frascino
> <vincenzo.frascino@arm.com> wrote:
>>
>> This patchset implements the asynchronous mode support for ARMv8.5-A
>> Memory Tagging Extension (MTE), which is a debugging feature that allows
>> to detect with the help of the architecture the C and C++ programmatic
>> memory errors like buffer overflow, use-after-free, use-after-return, etc.
>>
>> MTE is built on top of the AArch64 v8.0 virtual address tagging TBI
>> (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any
>> subset of its address space that is multiple of a 16 bytes granule. MTE
>> is based on a lock-key mechanism where the lock is the tag associated to
>> the physical memory and the key is the tag associated to the virtual
>> address.
>> When MTE is enabled and tags are set for ranges of address space of a task,
>> the PE will compare the tag related to the physical memory with the tag
>> related to the virtual address (tag check operation). Access to the memory
>> is granted only if the two tags match. In case of mismatch the PE will raise
>> an exception.
>>
>> The exception can be handled synchronously or asynchronously. When the
>> asynchronous mode is enabled:
>> - Upon fault the PE updates the TFSR_EL1 register.
>> - The kernel detects the change during one of the following:
>> - Context switching
>> - Return to user/EL0
>> - Kernel entry from EL1
>> - Kernel exit to EL1
>> - If the register has been updated by the PE the kernel clears it and
>> reports the error.
>>
>> The series is based on linux-next/akpm.
>>
>> To simplify the testing a tree with the new patches on top has been made
>> available at [1].
>>
>> [1] https://git.gitlab.arm.com/linux-arm/linux-vf.git mte/v13.async.akpm
>
> Acked-by: Andrey Konovalov <andreyknvl@google.com>
> Tested-by: Andrey Konovalov <andreyknvl@google.com>
>
> for the series.
>
> Thank you, Vincenzo!
>
Thanks to you!
--
Regards,
Vincenzo
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next prev parent reply other threads:[~2021-03-12 14:59 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 14:22 [PATCH v15 0/8] arm64: ARMv8.5-A: MTE: Add async mode support Vincenzo Frascino
2021-03-12 14:22 ` [PATCH v15 1/8] arm64: mte: Add asynchronous " Vincenzo Frascino
2021-03-12 14:22 ` [PATCH v15 2/8] kasan: Add KASAN mode kernel parameter Vincenzo Frascino
2021-03-12 14:22 ` [PATCH v15 3/8] arm64: mte: Drop arch_enable_tagging() Vincenzo Frascino
2021-03-12 14:22 ` [PATCH v15 4/8] kasan: Add report for async mode Vincenzo Frascino
2021-03-12 14:22 ` [PATCH v15 5/8] arm64: mte: Enable TCO in functions that can read beyond buffer limits Vincenzo Frascino
2021-03-12 15:13 ` Catalin Marinas
2021-03-12 15:23 ` Vincenzo Frascino
2021-03-12 15:29 ` Catalin Marinas
2021-03-12 15:44 ` Vincenzo Frascino
2021-03-12 14:22 ` [PATCH v15 6/8] arm64: mte: Enable async tag check fault Vincenzo Frascino
2021-03-12 14:22 ` [PATCH v15 7/8] arm64: mte: Report async tag faults before suspend Vincenzo Frascino
2021-03-12 14:22 ` [PATCH v15 8/8] kasan, arm64: tests supports for HW_TAGS async mode Vincenzo Frascino
2021-03-12 14:49 ` Andrey Konovalov
2021-03-12 14:56 ` Vincenzo Frascino
2021-03-12 14:50 ` [PATCH v15 0/8] arm64: ARMv8.5-A: MTE: Add async mode support Andrey Konovalov
2021-03-12 14:56 ` Vincenzo Frascino [this message]
2021-03-12 15:14 ` Catalin Marinas
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