linux-kernel - Re: CONFIG_THUMB2_KERNEL=y boot failure after Spectre BHB fixes

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Message-ID: <YkSlO4BOyQv9uTyd@shell.armlinux.org.uk>
Date:   Wed, 30 Mar 2022 19:45:15 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Christian Eggers <ceggers@...i.de>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        llvm@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>
Subject: Re: CONFIG_THUMB2_KERNEL=y boot failure after Spectre BHB fixes

On Wed, Mar 30, 2022 at 08:27:56PM +0200, Christian Eggers wrote:
> On Wednesday, 30 March 2022, 19:42:31 CEST, Ard Biesheuvel wrote:
> > Thanks for confirming. The first fix affects all Thumb2
> > configurations, my patch only affects Thumb2 configurations that
> > actually enable the loop8 mitigation for Spectre-BHB.
> > 
> > What type of CPU are you booting on?
> 
> NXP i.MX6ULL (ARM Cortex-A7).

As Cortex-A7 is not listed in Arm Ltd's table for speculative processor
vulnerabilities, the kernel doesn't implement any workarounds.

-- 
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