On Wednesday, February 25, 2015 22:17 CET, Andrew Daugherity
<[email protected]> wrote:
> On Sat, Feb 21, 2015 at 3:52 PM, Raimundo Santos <[email protected]> wrote:
>
> > On 21 February 2015 at 10:31, Markus Kolb <[email protected]> wrote:
> > >
> > > there isn't any support for Xen PV DomU in OpenBSD, isn't it?
> >
> > No, there is not such support.
> >
> > But you can run it in HVM mode without effort. Well, may be some effort in
> > XenServer, where there is no easy way to chose the type of emulated
> > hardware.
> >
> That's rather stupid, but apparently true[1].
>
> I've only used Xen on Linux hosts (primarily SUSE) where it's easy to edit
> the VM config files. I did have to use model=e1000 for OpenBSD, as the
> rtl8139 (re0 on openbsd) didn't work properly; I just now tested
> model=virtio and that seems to work too, showing up as vio0. I also have
> to use bsd.sp as bsd.mp crashes on boot.
That's how i run it too, also on SLES XEN dom0, with virtio network card
model, and bsd.sp, due to the crashers on bsd.mp.
I tried a whole lot of combinations of options in the VM config files, but
nothing
helped so far to get around the crashers observed with bsd.mp.
>
> Another "problem" when using Xen: the shutdown. Every OS that can not
> > communicate with xenstore will suffer from that. You will have to edit some
> > scripts in your environment to make it work with ACPI.
> >
> Thanks for the info. I hadn't run into this since on Xen I mostly run PV
> Linux guests, with the occasional HVM guest w/PV drivers (Linux, FreeBSD,
> Windows), and my OpenBSD usage has mostly been on physical hardware, but it
> bears noting:
>
> On HVM guests without PV drivers, 'xm shutdown <vm>' will instantly kill
> the VM, without syncing, and similarly, 'xm reboot <vm>' will instantly
> reset it. The newer 'xl' tool is more graceful and will refuse an 'xl
> {shutdown, reboot}' when there isn't guest PV support (you can still 'xl
> destroy', of course, or 'xl {shutdown, reboot} -F <vm>' to send an ACPI
> power button/reset button event).
>
> To trigger an orderly shutdown on an OpenBSD guest, send an ACPI power
> button event:
> xm trigger <vm> power
>
> I discovered this solution via [2].
>
> Also, when a serial console is configured on the OpenBSD guest, it shows up
> on the 'xm console'/virt-manager "Serial 1" view, which is nice, since you
> can copy/paste from that, unlike the emulated VGA console. This apparently
> requires 'serial=pty' in the VM config, but that's already the default in
> my setup.
yep, serial console works well that way.
Sebastian
>
> -Andrew
>
> [1]
> http://www.netservers.co.uk/articles/open-source-howtos/citrix_e1000_gigabit
> [2] https://github.com/ClusterLabs/resource-agents/commit/306dccb
