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From: Catalin Marinas <catalin.marinas@arm.com>
To: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Will Deacon <will@kernel.org>,
	Andrey Konovalov <andreyknvl@gmail.com>,
	Evgenii Stepanov <eugenis@google.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4] arm64: kasan: mte: move GCR_EL1 switch to task switch when KASAN disabled
Date: Fri, 24 Sep 2021 12:35:04 +0100	[thread overview]
Message-ID: <YU236MqtyqSwlLa0@arm.com> (raw)
In-Reply-To: <20210924010655.2886918-1-pcc@google.com>

On Thu, Sep 23, 2021 at 06:06:55PM -0700, Peter Collingbourne wrote:
> It is not necessary to write to GCR_EL1 on every kernel entry and
> exit when HW tag-based KASAN is disabled because the kernel will not
> execute any IRG instructions in that mode. Since accessing GCR_EL1
> can be expensive on some microarchitectures, avoid doing so by moving
> the access to task switch when HW tag-based KASAN is disabled.
> 
> Signed-off-by: Peter Collingbourne <pcc@google.com>
> Acked-by: Andrey Konovalov <andreyknvl@gmail.com>
> Link: https://linux-review.googlesource.com/id/I78e90d60612a94c24344526f476ac4ff216e10d2

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

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  reply	other threads:[~2021-09-24 11:36 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24  1:06 [PATCH v4] arm64: kasan: mte: move GCR_EL1 switch to task switch when KASAN disabled Peter Collingbourne
2021-09-24 11:35 ` Catalin Marinas [this message]
2021-09-29 17:48 ` Will Deacon

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