linux-kernel - Re: Fail to early boot with v2.6.27-rc2 to at least v2.6.29-rc2 due to dc1e35c

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Message-ID: <85492.1232422525@turing-police.cc.vt.edu>
Date:	Mon, 19 Jan 2009 22:35:25 -0500
From:	Valdis.Kletnieks@...edu
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Avuton Olrich <avuton@...il.com>, "H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: Fail to early boot with v2.6.27-rc2 to at least v2.6.29-rc2 due to dc1e35c

On Mon, 19 Jan 2009 13:57:36 PST, Suresh Siddha said:

> Though the bios is the culprit and this option will severely limit
> the cpu capabilities that OS can take advantage of, OS should fallback
> to a safer mode. I will have a patch for it.
> 
> Also, I wonder, if we should complain/scream during boot if we find only
> fewer cpuid levels on modern generation cpu's.

I think a KERN_INFO "Core2 E9700 expected 6 cpuid levels, got 4"
would possibly be a good idea.

Might be a good idea to check what happens under VMWare and similar though, it
looks like the type of thing a hypervisor is likely to do something odd to us...

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