linux-kernel - Re: [Xen-devel] [PATCH] xen: privcmd: schedule() after private hypercall when non CONFIG

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Message-ID: <20141201133245.GA25677@wotan.suse.de>
Date:	Mon, 1 Dec 2014 14:32:45 +0100
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	Juergen Gross <jgross@...e.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>, x86@...nel.org,
	kvm@...r.kernel.org, "Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	linux-kernel@...r.kernel.org, Davidlohr Bueso <dbueso@...e.de>,
	Joerg Roedel <jroedel@...e.de>,
	Jan Beulich <JBeulich@...e.com>,
	xen-devel@...ts.xenproject.org, boris.ostrovsky@...cle.com,
	Borislav Petkov <bp@...e.de>, Olaf Hering <ohering@...e.de>
Subject: Re: [Xen-devel] [PATCH] xen: privcmd: schedule() after private
	hypercall when non CONFIG_PREEMPT

On Mon, Dec 01, 2014 at 11:01:18AM +0000, David Vrabel wrote:
> On 28/11/14 04:49, Juergen Gross wrote:
> > On 11/27/2014 07:50 PM, Andrew Cooper wrote:
> >> 
> >> XenServer uses
> >>
> >> https://github.com/xenserver/linux-3.x.pg/blob/master/master/0001-x86-xen-allow-privcmd-hypercalls-to-be-preempted.patch
> >>
> >>
> >> to deal with these issues.  That patch is based on 3.10.
> > 
> > Clever. :-)
> > 
> >>
> >> I can remember whether this has been submitted upstream before (and
> >> there were outstanding issues), or whether it fell at an inconvenient
> >> time with our development cycles.
> > 
> > I found
> > 
> > http://lists.xen.org/archives/html/xen-devel/2014-02/msg02540.html
> > 
> > and nothing else.
> 
> I dropped it because it copy-and-paste a bunch of otherwise generic x86
> assembler and looked unlikely to get an x86 maintainer ack.  If you
> think otherwise, feel free to pick it up and run with it.

I was trying to run with it, but my biggest gripe with this was
the use of preempt_schedule_irq(), but we can review that on the
other thread.

  Luis
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