Re: Requesting for freeze exception for VT-d posted-interrupts

From: Wei Liu <wei.liu2@citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Kevin Tian <kevin.tian@intel.com>, Wei Liu <wei.liu2@citrix.com>,
	George Dunlap <george.dunlap@eu.citrix.com>,
	"andrew.cooper3@citrix.com" <andrew.cooper3@citrix.com>,
	Yong Y Wang <yong.y.wang@intel.com>,
	"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
	Yang Z Zhang <yang.z.zhang@intel.com>,
	Feng Wu <feng.wu@intel.com>
Subject: Re: Requesting for freeze exception for VT-d posted-interrupts
Date: Tue, 14 Jul 2015 15:17:40 +0100	[thread overview]
Message-ID: <20150714141740.GJ4152@zion.uk.xensource.com> (raw)
In-Reply-To: <55A4FBEB020000780009090C@mail.emea.novell.com>

On Tue, Jul 14, 2015 at 11:09:15AM +0100, Jan Beulich wrote:
> >>> On 14.07.15 at 11:21, <wei.liu2@citrix.com> wrote:
> > On Tue, Jul 14, 2015 at 05:51:02AM +0000, Wu, Feng wrote:
> >> Is it possible to get to 4.6 if making this feature default off?
> > 
> > Note that I'm not the only one who makes the decision and I can't speak
> > for maintainers. The first thing you ought to do is to convince
> > maintainers, not me.
> > 
> > If you ask for my opinion -- I don't see a point in releasing feature
> > with security flaw in design, even if it is off by default. 
> 
> It was actually me who suggested that by flagging this experimental
> and defaulting it to off, chances would increase for this to be allowed
> in without said issue fixed.
> 

Are you satisfied with that?  Currently I only know from this email
there is concern with regard to security but I don't know what it is and
how big an impact it can possibly have.

I could maybe go dig up that series and try to understand what is the
security implication, but it would take a long time and I'm not sure I
have the right technical background to make the call.

Wei.

> Jan