linux-kernel - Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted on 64-bit

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Message-ID: <54C76334.2080003@citrix.com>
Date:	Tue, 27 Jan 2015 10:06:44 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
CC:	Andy Lutomirski <luto@...capital.net>, <rostedt@...dmis.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	<x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	<paulmck@...ux.vnet.ibm.com>, <xen-devel@...ts.xenproject.org>,
	<boris.ostrovsky@...cle.com>, <konrad.wilk@...cle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Luis Rodriguez <Mcgrof@...e.com>, Borislav Petkov <bp@...e.de>,
	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v5 2/2] x86/xen: allow privcmd hypercalls to be preempted
 on 64-bit

On 27/01/15 08:35, Jan Beulich wrote:
>>>> On 27.01.15 at 02:51, <mcgrof@...not-panic.com> wrote:
> 
> Even if David told you this would be acceptable, I have to question
> an abstract model of fixing issues on only 64-bit kernels - this may
> be acceptable for distro purposes, but seems hardly the right
> approach for upstream. If 32-bit ones are to become deliberately
> broken, the XEN config option should become dependent on !X86_32.

I'd rather have something omitted (keeping the current behaviour) than
something that has not been tested at all.

Obviously it would be preferable to to fix both 32-bit and 64-bit x86
(and ARM as well) but I'm not going to block an important bug fix for
the majority use case (64-bit x86).

David
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