linux-kernel - Re: Do the x86 kernel entry points need an xabort on TSX cpus?

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Message-ID: <4F43F0C0.5050104@zytor.com>
Date:	Tue, 21 Feb 2012 11:30:08 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	"H. Peter Anvin" <hpa@...ux.intel.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Do the x86 kernel entry points need an xabort on TSX cpus?

On 02/10/2012 09:24 AM, Andy Lutomirski wrote:
> 
> Is that architecturally guaranteed?  (My manual suggests that it's 
> specifically *not* guaranteed, which is surprising.)
> 

I asked internally for a statement, and got the following:

"Intel does not expect operating systems to require XABORT at the entry
points.  Intel takes system security extremely seriously and that any
functionality added is scrutinized for security implications."

	-hpa

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