From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony PERARD Subject: Re: Xen 4.3 development update Date: Mon, 13 May 2013 16:39:35 +0100 Message-ID: <51910937.8090803@citrix.com> References: <518CD8D8.3090307@citrix.com> <518D046A.2090002@m2r.biz> <1368440802.537.45.camel@zakaz.uk.xensource.com> <5190FE81.3060106@m2r.biz> <519101E5.2060309@eu.citrix.com> <1368458106.537.118.camel@zakaz.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1368458106.537.118.camel@zakaz.uk.xensource.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Ian Campbell , George Dunlap Cc: Fabio Fantoni , "xen-devel@lists.xen.org" , Stefano Stabellini List-Id: xen-devel@lists.xenproject.org On 13/05/13 16:15, Ian Campbell wrote: > On Mon, 2013-05-13 at 16:08 +0100, George Dunlap wrote: >> OK -- so you're saying that qxl actually *does* work, but just in a >> limited fashion: as long as the guest only access the standard vga >> interface, then you can connect over spice; but if the guest uses the >> special qxl interface, then it crashes. Of what I can understand of the few tests I've run, and what it said in this thread, qxl *does not* work. The standard vga is, IMHO, for compatibility with a guest that does not have qxl driver or early at boot when a qxl driver can not be started. QXL is not require in order to use SPICE. So there is no benefit for now of having "vga = qxl" in the guest config file. >> We don't really use qxl, so that wasn't clear at first; we thought that >> you were saying it didn't work at all. > > yes, it's all much clearer to me now, thanks Fabio. > >> If it didn't work at all, then there's no point exposing functionality >> that can't actually work. But since there is new functionality (albeit >> limited) exposed by the "qxl" option, we should keep it in. >> >> But we do need to make sure to set people's expectations properly -- our >> release notes will have to advertize "partial qxl support". > > Fabio, Is there some mechanism by which we can disable the magic qxl > interface and only leave qxl vga enabled, i.e. to workaround the > unfortunate crash? I believe we would have to remove "vga = qxl" somehow, like adding an error "QXL not supported for now", unless we are able to find the issue between Xen and QXL. -- Anthony PERARD