On Wed, Jun 08, 2016 at 10:35:22PM +0000, Marcin Cieslak wrote:
> On Wed, 8 Jun 2016, Marcin Cieslak wrote:
> 
> > On Fri, 3 Jun 2016, Roger Pau Monné wrote:
> > 
> > > Hello,
> > > 
> > > First of all, this message is only relevant to those that use FreeBSD as 
> > > Dom0 (host), not as a DomU (guest), so don't panic.
> > > 
> > > I've imported the latest Xen version (4.7-rc4) into the ports tree, it's 
> > > still not the final version, but it's quite close, so we better start 
> > > testing it to make sure it works fine with FreeBSD.
> 
> One issue maybe unrelated to FreeBSD:
> 
> This domain:
> 
> builder = "hvm"
> memory = 4096
> vcpus = 2
> name = "Windows2016"
> disk = [
>         '/dev/zvol/zroot/windows0,raw,hda,w',
>         '/dev/zvol/zroot/vs2013,raw,hdb,w',
> #        '/root/win/install.iso,raw,hdc:cdrom,r'
> ]
> boot = "c" # Boot to hard disk image
> vnc = 2
> #vnclisten = "0.0.0.0"
> usbdevice = 'tablet'
> on_poweroff = 'destroy'
> on_reboot = 'restart'
> on_crash = 'restart'
> acpi = 1
> bios = 'ovmf'
> vif = [ 'bridge=bridge0,mac=00:16:3e:5d:0d:48' ]
> videoram=16
> vga = "stdvga"
> 
> crashes because I didn't have ovmf image:
> 
> (d203) HVM Loader
> (d203) Detected Xen v4.7.0-rc
> (d203) Xenbus rings @0xfeffc000, event channel 1
> (d203) Unknown BIOS ovmf, no ROM image found
> (d203) *** HVMLoader bug at hvmloader.c:229
> (d203) *** HVMLoader crashed.
> 
> But I seem unable to kill it with "xl destroy" - it keeps
> respawning again:
> 
> Windows2016                                211  4079     1     --p---       
> 0.0
> Windows2016                                213  4096     1     --psc-       
> 0.0
> (disappears)
> Windows2016                                221  4096     1     --psc-       
> 0.0
> (null)                                     221   147     1     --psc-       
> 0.0
> ...
> ...
> 
> I have finally managed to snatch it by issuing this a few times, after
> changing the "on_crash" to 'destroy':
> 
> # xl config-update Windows2016 xen/windows-run.cfg
> WARNING: xl now has better capability to manage domain configuration, avoid 
> using this command when possible
> setting dom243 configuration

The problem is that the domain crashed so early on boot that you weren't 
able to destroy it, and kept rebooting due to the "on_crash = 'restart'" 
option. IIRC I've also used the following hacky rune in order to terminate 
this kind of domains: "while [ 1 ]; do xl destroy <name>; done", but your 
solution seems better.

Roger.
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