linux-kernel - Re: [stable:PATCH v4.9.309 00/43] arm64: Mitigate spectre style branch history side channels

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Date:   Wed, 6 Apr 2022 20:23:59 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     James Morse <james.morse@....com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [stable:PATCH v4.9.309 00/43] arm64: Mitigate spectre style
 branch history side channels

On Wed, Apr 06, 2022 at 05:41:34PM +0100, James Morse wrote:
> Hello!
> 
> Compared to the v4.14 backport, this backport for v4.9 includes extra
> infrastructure for the arch timer driver, which is needed for the A76 timer
> workaround, which is needed to cleanly pick up the A76 MIDR definition.
> I didn't backport the Hisilicon 161010101 workaround as I'm unable to test it.
> 
> I also backported the capabilities midr-range support, which the bhb
> mitigation makes use of. Ard had already backported this to v4.14.
> I ended up backporting Ard's version from v4.14 as it conflicted less,
> and he had added A35 to the spectre-safe list.
> 
> .. and then the Spectre-BHB bits, where as before the KVM stuff is
> different to mainline as the infrastructure for doing this stuff is very
> different.

Looks great, many thanks for these!

greg k-h