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: <20090119221434.GF31356@linux-os.sc.intel.com>
Date:	Mon, 19 Jan 2009 14:14:35 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Avuton Olrich <avuton@...il.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, Jan 19, 2009 at 02:07:36PM -0800, H. Peter Anvin wrote:
> Suresh Siddha wrote:
> > 
> > Also, I wonder, if we should complain/scream during boot if we find only
> > fewer cpuid levels on modern generation cpu's.
> > 
> 
> We should, or if this block is reversible, we should probably just undo 
> it (the reason people put this block in places is because of, ahem, 
> inferior operating systems having bugs.)
> 
> Do you know how this is managed?  Via an MSR?

IA32_MISC_ENABLE MSR bit 22
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