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

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Date:	Tue, 27 Jan 2015 21:12:59 +0100
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	Jan Beulich <JBeulich@...e.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	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>, 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 Tue, Jan 27, 2015 at 10:06:44AM +0000, David Vrabel wrote:
> 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).

The hunk for 32-bit should indeed only go in once we get a Tested-by.
Please let me know if there is anything else needed for this patch.

  Luis
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