Re: [PATCH v4] arm64: kasan: mte: move GCR_EL1 switch to task switch when KASAN disabled
flat view
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2021-09-24 11:36:58
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 <redacted> Acked-by: Andrey Konovalov <andreyknvl@gmail.com> Link: https://linux-review.googlesource.com/id/I78e90d60612a94c24344526f476ac4ff216e10d2
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel