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From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Peter Collingbourne <pcc@google.com>,
	andreyknvl@google.com,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Will Deacon <will@kernel.org>
Subject: [PATCH] arm64: kasan: Set TCR_EL1.TBID1 when KASAN_HW_TAGS is enabled
Date: Mon,  4 Jan 2021 12:21:26 +0000	[thread overview]
Message-ID: <20210104122126.32478-1-catalin.marinas@arm.com> (raw)

Commit 49b3cf035edc ("kasan: arm64: set TCR_EL1.TBID1 when enabled") set
the TBID1 bit for the KASAN_SW_TAGS configuration, freeing up 8 bits to
be used by PAC. With in-kernel MTE now in mainline, also set this bit
for the KASAN_HW_TAGS configuration.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Peter Collingbourne <pcc@google.com>
---
 arch/arm64/mm/proc.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 37a54b57178a..1f7ee8c8b7b8 100644
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -46,7 +46,7 @@
 #endif
 
 #ifdef CONFIG_KASAN_HW_TAGS
-#define TCR_KASAN_HW_FLAGS SYS_TCR_EL1_TCMA1 | TCR_TBI1
+#define TCR_KASAN_HW_FLAGS SYS_TCR_EL1_TCMA1 | TCR_TBI1 | TCR_TBID1
 #else
 #define TCR_KASAN_HW_FLAGS 0
 #endif

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             reply	other threads:[~2021-01-04 12:23 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-04 12:21 Catalin Marinas [this message]
2021-01-04 12:28 ` [PATCH] arm64: kasan: Set TCR_EL1.TBID1 when KASAN_HW_TAGS is enabled Vincenzo Frascino
2021-01-05 17:09   ` Andrey Konovalov

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