linux-kernel - Re: Requirements for retpoline in Linux 4.15 (was: Re: Linux 4.15)

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Message-ID: <5520835.tArHHOCcxE@merkaba>
Date:   Mon, 29 Jan 2018 12:19:44 +0100
From:   Martin Steigerwald <martin@...htvoll.de>
To:     Martin Steigerwald <martin@...htvoll.de>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Requirements for retpoline in Linux 4.15 (was: Re: Linux 4.15)

Martin Steigerwald - 29.01.18, 11:42:
> > Try removing .cache.mk which has 'remembered' that your GCC doesn't
> > support retpoline.
> 
> I bet there have been "*.cache.mk" files around from previous pre gcc-7.3
> compiles.
> 
> Trying again after
> 
> % find -name ".cache.mk" -delete
> 
> on kernel source tree.
> 
> Will report back.

The whole thing works:

% grep . /sys/devices/system/cpu/vulnerabilities/*                                                       
/sys/devices/system/cpu/vulnerabilities/meltdown:Mitigation: PTI
/sys/devices/system/cpu/vulnerabilities/spectre_v1:Vulnerable
/sys/devices/system/cpu/vulnerabilities/spectre_v2:Mitigation: Full generic 
retpoline

I bet the virtualbox modules compiled by virtualbox-dkms will taint the 
support, but I bet sooner or later they will support retpoline as well. 
(Another reason to switch to KVM one day.)

Thank you.
-- 
Martin