linux-kernel - Re: [RFC] x86: xsave/xrstor support, ucontext

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Date:	Fri, 23 May 2008 14:11:54 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, roland@...hat.com, drepper@...hat.com,
	Hongjiu.lu@...el.com, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, rmk+lkml@....linux.org.uk, dan@...ian.org,
	asit.k.mallick@...el.com
Subject: Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

On Fri, May 23, 2008 at 01:46:25PM +0200, Mikael Pettersson wrote:
> H. Peter Anvin writes:
>  > Michael, you wrote:
>  > 
>  > > Hmm, right now it seems this field has a de-facto ABI of being
>  > > either 0xffff (plain) or 0x0000 (fxsr). Using other values would
>  > > confuse at least one application I know of. Sad.
>  > 
>  > ... could you share what application that is?  This otherwise would be 
>  > ideal.
> 
> It's the virtual machine for the Erlang/OTP concurrent functional
> language. It's open-source and used extensively for telecom and
> internet server applications.

I had a few reports over the years of other applications ddoing very weird 
specific things with the sigframe. So I agree it's fairly important
to be as compatible here as possible.

-Andi
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