linux-kernel - Re: [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/amd.c:220 init

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Message-ID: <20140307223929.GI5255@pd.tnic>
Date:	Fri, 7 Mar 2014 23:39:29 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Dave Jones <davej@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at
 arch/x86/kernel/cpu/amd.c:220 init_amd()

On Fri, Mar 07, 2014 at 05:27:43PM -0500, Dave Jones wrote:
> When I wrote it 10 years or so back it made more sense than it
> probably does now, so I'd be ok with just dropping it all too tbh.
> Machines of that vintage probably have bigger problems now anyway.

Yeah.

> I don't recall seeing a report of the taint flag being set ever in
> a Red Hat bug report, but we've seen countless problems from machines
> of that era with dying ram or motherboard capacitors or..

Right, this should be a sufficient indicator that those machines won't
be running modern kernels anymore :-)

Oh, and besides, this really frees up that taint bit TAINT_UNSAFE_SMP
for the forcepae thing. Let me cook up a patch - it looks like 3.14
will be the release where we're getting rid of old platforms - look at
tip/x86/nuke-platforms. :-)

> I still have NexGen docs somewhere ;)

Uuuh, more than ancient, make sure to hold on to those :-)

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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