Date: Thu, 9 Jun 2016 10:03:43 +0200 From: Roger Pau =?iso-8859-1?Q?Monn=E9?= <royger@FreeBSD.org> To: Marcin Cieslak <saper@saper.info> Cc: freebsd-xen@FreeBSD.org, xen-devel@lists.xenproject.org, freebsd-virtualization@freebsd.org Subject: Re: HEADS UP: Imported Xen 4.7: no blkback Message-ID: <20160609080343.44rvpda4hskiy3ge@mac> In-Reply-To: <alpine.BSF.2.11.1606090010280.2130@z.fncre.vasb> References: <20160603120921.y5l362zgrhf4fdcb@mac> <alpine.BSF.2.11.1606090010280.2130@z.fncre.vasb>
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On Thu, Jun 09, 2016 at 12:16:59AM +0000, Marcin Cieslak wrote: > On Fri, 3 Jun 2016, Roger Pau Monné wrote: > > > One of the more relevant changes in 4.7 regarding FreeBSD is the support for > > block hotplug scripts. This means that we now have the option to use > > backends different than simple block or regular files, provided that someone > > writes the proper hotplug scripts to attach them (I've heard there are some > > iSCSI hotplug scripts around). This however requires changes in blkback, so > > if you plan to use the Xen 4.7 port, please make sure that you are running a > > kernel that contains revision r301269 (or any later version). The same also > > I am running it with r301685 and the HVM guests have some trouble with > block devices. > > SeaBIOS does not find /dev/zvol/zroot/freebsd1,raw,xvda,w to boot FreeBSD > from, after chaging to "hda" I get up to the kernel mountroot prompt > (Xen block devices seem to be detected in dmesg). Yes, this is intentional, see: https://marc.info/?l=xen-devel&m=144482080812353 Have you checked if you need to change your /etc/fstab to correctly point to the new device? Does FreeBSD correctly list the disk(s) at the mountroot prompt when issuing a "?" command? Also, can you paste the output of `xenstore-ls -fp` from Dom0 when this happens? > What used to be Windows 2016 domU with /dev/zvol/zroot/windows0,raw,hda,w > ends up in the Tianocore UEFI shell. Block devices seem to be available, > I can even list the fs0: partition, but no booting further possible. Hm, I've never used Tianocore myself, so I'm not sure what the issue could be here. Again, can you post the output of `xenstore-ls -fp` from Dom0 when this happens? At least this will show if the PV block device has been correctly attached. Roger.
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