linux-kernel - Re: [PATCH 2/2] i387: split up <asm/i387.h> into exported and internal interfaces

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Message-ID: <4F4CB89C.4060500@redhat.com>
Date:	Tue, 28 Feb 2012 13:21:00 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, Josh Boyer <jwboyer@...il.com>,
	Jongman Heo <jongman.heo@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/2] i387: split up <asm/i387.h> into exported and internal
 interfaces

On 02/21/2012 11:41 PM, Linus Torvalds wrote:
> Btw, I really don't like what arch/x86/kvm/ does with CR0.TS and the FP
> state.  I'm not at all sure that's all kosher.  But I don't know the
> code, so I just made sure that at no point did any of the semantics
> change. 
>

Can you elaborate on what you don't like in the kvm code (apart from "it
does virtualiztion")?

btw, some time ago I did some work to lazify fpu save (as opposed to
just fpu restore) and abstract out the various users (user mode, kernel
threads, irq context, guest mode, and signal handlers).  This would
allow you to run task A's user mode with task B's fpu loaded, have
preemptible kernel fpu being, avoid fpu switching while handling
signals, and run user mode with a guest fpu loaded or vice versa. 
However I abandoned the effort as too complex.  Perhaps a more
determined hacker can make more progress there.

-- 
error compiling committee.c: too many arguments to function

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