> -----Original Message----- > From: Stefano Stabellini [mailto:sstabell...@kernel.org] > Sent: 07 September 2018 17:58 > To: Paul Durrant <paul.durr...@citrix.com> > Cc: 'Stefano Stabellini' <sstabell...@kernel.org>; xen- > de...@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>; > Tim (Xen.org) <t...@xen.org>; Wei Liu <wei.l...@citrix.com> > Subject: RE: [PATCH] tools: specifically enable VirtFS in Linux QEMU builds > > 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.
I see. I guess that probably means cycling through closing->closed and back to initwait has not been exercised in the backend. I'll bear that in mind when I get to that stage. Thanks :-) Paul _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
