From: f.fainelli@gmail.com (Florian Fainelli)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 07/14] ARM: spectre-v2: add Cortex A8 and A15 validation of the IBE bit
Date: Wed, 16 May 2018 09:33:18 -0700 [thread overview]
Message-ID: <a3ea8562-40b1-88b8-8bba-f6de8f9ac8cb@gmail.com> (raw)
In-Reply-To: <E1fIuBF-0003q0-3d@rmk-PC.armlinux.org.uk>
On 05/16/2018 04:01 AM, Russell King wrote:
> When the branch predictor hardening is enabled, firmware must have set
> the IBE bit in the auxiliary control register. If this bit has not
> been set, the Spectre workarounds will not be functional.
>
> Add validation that this bit is set, and print a warning at alert level
> if this is not the case.
>
> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
I would be keen on updating arch/arm/kernel/head.S to to attempt setting
ACTRL[0]=1 on A15/B15, if the kernel executes at the appropriate
privilege level, this will succeed, if not, this should result in an
ignored write. What do you think?
--
Florian
next prev parent reply other threads:[~2018-05-16 16:33 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-16 10:59 [PATCH 0/14] ARM Spectre variant 2 fixes Russell King - ARM Linux
2018-05-16 11:00 ` [PATCH 01/14] ARM: add CPU part numbers for Cortex A73, A75 and Brahma B15 Russell King
2018-05-16 16:19 ` Florian Fainelli
2018-05-16 11:00 ` [PATCH 02/14] ARM: bugs: prepare processor bug infrastructure Russell King
2018-05-16 16:21 ` Florian Fainelli
2018-05-16 11:00 ` [PATCH 03/14] ARM: bugs: hook processor bug checking into SMP and suspend paths Russell King
2018-05-16 16:23 ` Florian Fainelli
2018-05-19 10:13 ` Russell King - ARM Linux
2018-05-16 11:00 ` [PATCH 04/14] ARM: bugs: add support for per-processor bug checking Russell King
2018-05-16 16:23 ` Florian Fainelli
2018-05-16 11:01 ` [PATCH 05/14] ARM: spectre: add Kconfig symbol for CPUs vulnerable to Spectre Russell King
2018-05-16 16:24 ` Florian Fainelli
2018-05-16 11:01 ` [PATCH 06/14] ARM: spectre-v2: harden branch predictor on context switches Russell King
2018-05-16 11:33 ` Vladimir Murzin
2018-05-16 11:01 ` [PATCH 07/14] ARM: spectre-v2: add Cortex A8 and A15 validation of the IBE bit Russell King
2018-05-16 16:33 ` Florian Fainelli [this message]
2018-05-16 16:34 ` Florian Fainelli
2018-05-22 10:38 ` Geert Uytterhoeven
2018-05-22 10:55 ` Russell King - ARM Linux
2018-05-16 11:01 ` [PATCH 08/14] ARM: spectre-v2: harden user aborts in kernel space Russell King
2018-05-16 16:35 ` Florian Fainelli
2018-05-16 11:01 ` [PATCH 09/14] ARM: spectre-v2: add PSCI based hardening Russell King
2018-05-16 17:01 ` Marc Zyngier
2018-05-16 11:01 ` [PATCH 10/14] ARM: KVM: invalidate BTB on guest exit for Cortex-A12/A17 Russell King
2018-05-16 11:01 ` [PATCH 11/14] ARM: KVM: invalidate icache on guest exit for Cortex-A15 Russell King
2018-05-16 11:01 ` [PATCH 12/14] ARM: spectre-v2: KVM: invalidate icache on guest exit for Brahma B15 Russell King
2018-05-16 16:27 ` Florian Fainelli
2018-05-16 11:01 ` [PATCH 13/14] ARM: KVM: Add SMCCC_ARCH_WORKAROUND_1 fast handling Russell King
2018-05-16 11:01 ` [PATCH 14/14] ARM: KVM: report support for SMCCC_ARCH_WORKAROUND_1 Russell King
-- strict thread matches above, loose matches on Subject: below --
2018-05-21 11:42 [PATCH v2 00/14] ARM Spectre variant 2 fixes Russell King - ARM Linux
2018-05-21 11:44 ` [PATCH 07/14] ARM: spectre-v2: add Cortex A8 and A15 validation of the IBE bit Russell King
2018-05-22 18:28 ` Tony Lindgren
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