On Fri, 7 Sep 2018, Paul Durrant wrote: > > -----Original Message----- > > From: Stefano Stabellini [mailto:sstabell...@kernel.org] > > Sent: 06 September 2018 19:12 > > To: Paul Durrant <paul.durr...@citrix.com> > > Cc: xen-devel@lists.xenproject.org; Andrew Cooper > > <andrew.coop...@citrix.com>; George Dunlap > > <george.dun...@citrix.com>; Ian Jackson <ian.jack...@citrix.com>; Jan > > Beulich <jbeul...@suse.com>; Julien Grall <julien.gr...@arm.com>; Konrad > > Rzeszutek Wilk <konrad.w...@oracle.com>; Stefano Stabellini > > <sstabell...@kernel.org>; Tim (Xen.org) <t...@xen.org>; Wei Liu > > <wei.l...@citrix.com> > > Subject: Re: [PATCH] tools: specifically enable VirtFS in Linux QEMU builds > > > > On Thu, 6 Sep 2018, Paul Durrant wrote: > > > 9pfs support has been a documented feature since Xen 4.9, but QEMU will > > > not be built with backend support unless libcap and libattr dev packages > > > are installed. > > > > > > This patch modifies the README to call out those packages as pre- > > requisites > > > for Linux builds and specifically enables VirtFS in the configure line > > > for QEMU so that an error message is displayed if they are missing. > > > > > > Signed-off-by: Paul Durrant <paul.durr...@citrix.com> > > > > Thank you, Paul! > > NP. I'm at the point of seriously considering a Windows frontend, which is > why I've been playing. > > BTW, as a heads-up... Before I realised QEMU was not building the backend, I > tried a modprobe of the Xen 9pfs transport module in a Linux guest and > immediately hit a kernel BUG (NULL ptr IIRC) which was apparently down to the > frontend expecting the backend to be present when its probe routine is run, > rather than deferring things until the backend goes into InitWait (which is > what a frontend generally should do). Also, it's non-obvious why I have to > explicitly modprobe anyway... Shouldn't the module get demand-loaded when I > run mount -t 9pfs blah?
Interesting. I don't recall ever testing this is a scenario, so I am not surprised it is broken. I don't know why the module doesn't get loaded automatically. FYI another thing missing is suspend/resume support in the driver. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
