From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: Rebooting domu fails in nfs share exported from another domu on the same dom0 Date: Fri, 18 Jul 2014 16:22:15 -0400 Message-ID: <20140718202215.GC14318@konrad-lan.dumpdata.com> References: <53C6E24D.7050903@oracle.com> <53C7F088.5070005@citrix.com> <53C8002C.2020501@oracle.com> <20140718185312.GE15947@laptop.dumpdata.com> <53C9761F.3040803@oracle.com> <20140718194334.GK15947@laptop.dumpdata.com> <53C980BE.5040208@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: <53C980BE.5040208@oracle.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: annie li Cc: "xen-devel@lists.xen.org" , Roger Pau =?iso-8859-1?Q?Monn=E9?= List-Id: xen-devel@lists.xenproject.org On Fri, Jul 18, 2014 at 04:17:02PM -0400, annie li wrote: > = > On 2014/7/18 15:43, Konrad Rzeszutek Wilk wrote: > >On Fri, Jul 18, 2014 at 03:31:43PM -0400, annie li wrote: > >>On 2014/7/18 14:53, Konrad Rzeszutek Wilk wrote: > >>>On Thu, Jul 17, 2014 at 12:56:12PM -0400, annie li wrote: > >>>>On 2014/7/17 11:49, Roger Pau Monn=E9 wrote: > >>>>>On 16/07/14 22:36, annie li wrote: > >>>>>>Hi > >>>>>> > >>>>>>I hit a problem in such scenario: vm1 is running and export nfs ser= vice, > >>>>>>dom0 mount this nfs, and vm2 is booted in this nfs location. vm1 an= d vm2 > >>>>>>are running on the same dom0. > >>>>>> > >>>>>>When this bug happens, the data flow is: vm2 blkfront-> vm2 blkbac= k-> > >>>I am a bit confused here. 'vm2 blkfront -> vm2 blkback'? Did you > >>>mean 'dom0 blkback'? > >>Yes, Dom0 blkback. > >> > >>> > >>>>>>loop -> nfs file -> nfs client -> bridge priv1 -> vm1 vif -> vm1 ne= tback > >>>>>>-> vm1 netfront. > >>>So both netback and netfront run in the same guest? I think you > >>>want these two swapped around (netfront -> netback). > >>No, the netfront in above routine means the one in guest vm1, and this = is > >>network RX path in vm1. > >OK, so 'dom0 netback' then. As the netback thread is running in the > >initial domain? > = > Netback thread is running in Dom0 as normal, and the two vms are all > normal vm, not driver domain. Probably my initial description causes > some confusion. > = > > > >So a revised view is: > > > > vm2 blkfront -> dom0 blkback -> loop -> nfs file -> nfs client > > -> bridge priv1 -> vm1 vif -> dom0 netback -> vm1 netfront > > > >So with the grant map (blkfront -> blkback) the source is dom0 > >and the destination is vm1. > = > You mean destination is vm2 here, right? Yes :-) > But I am little confused. Blkfront of vm2 sends out request to > blkback, and the data page is allocated from vm2. So the grant map > source is vm2, destination is dom0. Anything I missed here? > = > > For the grant copy, the source is > >dom0 and the destinatation is vm2 right? (or did I get my src > >and dst confused?). > = > You mean vm1 here, right? Heh. > If so, yes, source is dom0, and destination is vm1. > In grantcopy code, it checks whether the source is from dom0, if > not, then an error is thrown out. In this situation, the source is > from vm2 which is grant mapped. In both cases dom0 is part of the equation. In one case it is the destination and in another it is the source - both cases for the same page right? > = > Thanks > Annie > > > > > >_______________________________________________ > >Xen-devel mailing list > >Xen-devel@lists.xen.org > >http://lists.xen.org/xen-devel > =