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Re: [Xen-devel] HEADS UP: Imported Xen 4.7: no blkback



On Thu, Jun 09, 2016 at 10:03:43AM +0200, Roger Pau Monné wrote:
> 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
> 

Note that I reverted that change yesterday. 4.7 will behave as before.

Wei.

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