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From: Christian Eggers <ceggers@arri.de>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: "Russell King (Oracle)" <linux@armlinux.org.uk>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	<llvm@lists.linux.dev>, Nathan Chancellor <nathan@kernel.org>
Subject: Re: CONFIG_THUMB2_KERNEL=y boot failure after Spectre BHB fixes
Date: Wed, 30 Mar 2022 20:27:56 +0200	[thread overview]
Message-ID: <1896453.PYKUYFuaPT@localhost.localdomain> (raw)
In-Reply-To: <CAMj1kXGbNtJPEowha8=vFgjdv_m2viHJ2Q7AqtJeqOPLa8-1Sg@mail.gmail.com>

On Wednesday, 30 March 2022, 19:42:31 CEST, Ard Biesheuvel wrote:
> On Wed, 30 Mar 2022 at 19:33, Christian Eggers <ceggers@arri.de> wrote:
> >
> > I just switched to v5.15.31-rt38 which already includes
> > 6c7cb60bff7a ("ARM: fix Thumb2 regression")
> >
> > This kernel boots fine now, even with CONFIG_HARDEN_BRANCH_HISTORY=y. After
> > applying the patch series from Ard, the system still boots fine.
> >
> > I haven't any understanding what these patches do. Is there anything I shall
> > test?
> >
> 
> 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).




WARNING: multiple messages have this Message-ID (diff)
From: Christian Eggers <ceggers@arri.de>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: "Russell King (Oracle)" <linux@armlinux.org.uk>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	<llvm@lists.linux.dev>, Nathan Chancellor <nathan@kernel.org>
Subject: Re: CONFIG_THUMB2_KERNEL=y boot failure after Spectre BHB fixes
Date: Wed, 30 Mar 2022 20:27:56 +0200	[thread overview]
Message-ID: <1896453.PYKUYFuaPT@localhost.localdomain> (raw)
In-Reply-To: <CAMj1kXGbNtJPEowha8=vFgjdv_m2viHJ2Q7AqtJeqOPLa8-1Sg@mail.gmail.com>

On Wednesday, 30 March 2022, 19:42:31 CEST, Ard Biesheuvel wrote:
> On Wed, 30 Mar 2022 at 19:33, Christian Eggers <ceggers@arri.de> wrote:
> >
> > I just switched to v5.15.31-rt38 which already includes
> > 6c7cb60bff7a ("ARM: fix Thumb2 regression")
> >
> > This kernel boots fine now, even with CONFIG_HARDEN_BRANCH_HISTORY=y. After
> > applying the patch series from Ard, the system still boots fine.
> >
> > I haven't any understanding what these patches do. Is there anything I shall
> > test?
> >
> 
> 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).




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  reply	other threads:[~2022-03-30 18:29 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-10 19:16 CONFIG_THUMB2_KERNEL=y boot failure after Spectre BHB fixes Nathan Chancellor
2022-03-10 19:16 ` Nathan Chancellor
2022-03-22 17:49 ` Christian Eggers
2022-03-22 17:49   ` Christian Eggers
2022-03-30 16:11   ` Russell King (Oracle)
2022-03-30 16:11     ` Russell King (Oracle)
2022-03-30 16:34     ` Ard Biesheuvel
2022-03-30 16:34       ` Ard Biesheuvel
2022-03-30 16:36       ` Russell King (Oracle)
2022-03-30 16:36         ` Russell King (Oracle)
2022-03-30 16:45         ` Ard Biesheuvel
2022-03-30 16:45           ` Ard Biesheuvel
2022-03-30 17:32           ` Christian Eggers
2022-03-30 17:32             ` Christian Eggers
2022-03-30 17:42             ` Ard Biesheuvel
2022-03-30 17:42               ` Ard Biesheuvel
2022-03-30 18:27               ` Christian Eggers [this message]
2022-03-30 18:27                 ` Christian Eggers
2022-03-30 18:45                 ` Russell King (Oracle)
2022-03-30 18:45                   ` Russell King (Oracle)

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