[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Rebooting domu fails in nfs share exported from another domu on the same dom0
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 Monné wrote: > >>>>>On 16/07/14 22:36, annie li wrote: > >>>>>>Hi > >>>>>> > >>>>>>I hit a problem in such scenario: vm1 is running and export nfs service, > >>>>>>dom0 mount this nfs, and vm2 is booted in this nfs location. vm1 and vm2 > >>>>>>are running on the same dom0. > >>>>>> > >>>>>>When this bug happens, the data flow is: vm2 blkfront-> vm2 blkback-> > >>>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 netback > >>>>>>-> 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@xxxxxxxxxxxxx > >http://lists.xen.org/xen-devel > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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