From: Andi Kleen <ak@suse.de>
To: Zachary Amsden <zach@vmware.com>
Cc: Chuck Ebbert <76306.1226@compuserve.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>
Subject: Re: [patch] i386: remove IOPL check on task switch
Date: Fri, 3 Nov 2006 19:41:28 +0100 [thread overview]
Message-ID: <200611031941.28907.ak@suse.de> (raw)
In-Reply-To: <454B850C.3050402@vmware.com>
> Nack. This is used for paravirt-ops kernels that use IOPL'd userspace.
> Fixing it would require a fairly heavy penalty on the iret path, since
> every single instruction there contributes to a critical region which
> must have custom fixup code, or some other technique to provide
> protection against interrupt re-entrancy.
>
> At least, let's discuss other potential solutions first - for now it is
> harmless.
Ok I will drop the patch again
-Andi
next prev parent reply other threads:[~2006-11-03 18:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-03 6:27 [patch] i386: remove IOPL check on task switch Chuck Ebbert
2006-11-03 18:06 ` Zachary Amsden
2006-11-03 18:41 ` Andi Kleen [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-11-03 23:57 Chuck Ebbert
2006-11-04 19:19 ` Zachary Amsden
2006-11-04 19:39 ` Zachary Amsden
2006-11-04 19:52 ` Linus Torvalds
2006-11-04 20:09 ` Zachary Amsden
2006-11-04 20:02 ` Andi Kleen
2006-11-04 0:00 Chuck Ebbert
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