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

["Roger Pau Monné" <roger.pau@citrix.com>]

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.