Re: DomU Windows Server Essentials crashes with xen 4.16 but works with xen 4.14

[Steffen Einsle <einsle@xxxxxxxxxx>]

Hello,

I can confirm that "msr_relaxed = 1" solves the problem with Server 2019 
Essentials crashing.
Am 26.04.2022 um 09:06 schrieb Roger Pau Monné:
> On Mon, Apr 25, 2022 at 07:19:08PM +0200, Steffen Einsle wrote:
> > Hello Everyone,
> >
> > I have some xen servers I recently tried to update from xen 4.14 to xen 4.16
> >
> > Everything worked without problem, except for the Windows Server Essentials
> > DomUs.
> >
> > With xen 4.16 those domains crashed (reproducable) during boot -
> > KMODE_EXCEPTION_NOT_HANDLED.
> >
> > I tried to install a new DomU Windows Server 2019 Essentials - this VM
> > crashed at the first reboot
> > (still in the installation routine) with the same error. No PV-drivers
> > installed yet.
> >
> > I switched back to xen 4.14 and all VMs booted ok without problem.
> >
> > All other VMs (Linux-PV, Windows-HVM (2008r2, 2012r2, 2016, 2019, 2022)
> > show no problems, only
> > the Windows Server Essentials crashes with xen 4.16.
> >
> > The system is a gentoo kernel 5.17.3, qemu-6.2.0-r4, xen-4.16.0-r5,
> > xen-tools-4.16.0-r1
> >
> > My working configuration is gentoo kernel 5.17.3, qemu-5.2.0-r2,
> > xen-4.14.3-r2, xen-tools-4.14.3
> >
> > My DomU config file looks like this
> >
> > name = 'DC-Server'
> > type = 'hvm'
> > memory = '8192'
> > vcpus = '6'
> > vif = [ 'mac=00:16:3E:ab:cd:50,bridge=br0' ]
> > disk = [ '/dev/vg1/ServerSys,raw,hda,rw',
> >                '/dev/vg1/ServerData,raw,hdb,rw' ]
> > viridian = 'all'
> > localtime = '1'
> > vnc = '1'
> > keymap = 'de'
> > vnclisten = '0.0.0.0:10,websocket'
> > usb = '1'
> > usbdevice = 'tablet'
> > on_crash  = 'restart'
> > boot = 'c'
> > xen_platform_pci = '1'
> > max_grant_frames = 128
> Could you try adding:
>
> msr_relaxed=1
>
> And see if that makes a difference?
>
> Thanks, Roger.