netdev - Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

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Message-ID: <20080811225709.GO13158@linux-os.sc.intel.com>
Date:	Mon, 11 Aug 2008 15:57:09 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Wolfgang Walter <wolfgang.walter@...m.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	"viro@...IV.linux.org.uk" <viro@...IV.linux.org.uk>,
	"vegard.nossum@...il.com" <vegard.nossum@...il.com>,
	austin zhang <austin_zhang@...ux.intel.com>
Subject: Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes

On Sat, Aug 09, 2008 at 10:41:48PM -0700, H. Peter Anvin wrote:
> Herbert Xu wrote:
> > On Sat, Aug 09, 2008 at 10:52:48AM -0700, Suresh Siddha wrote:
> >>> Actually I was mistaken, Intel has done the right thing by not
> >>> generating a fault on crc32c with TS set.
> >> Yes, the documentation seems to says so. But I am double checking
> >> with experts inside, to make sure we got the SDM right.

I got confirmation that crc32 instructions don't generate DNA when cr0.TS bit
is set. So no changes required for Austin's patches in this context.

thanks,
suresh
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