Re: [win-pv-devel] [Xen-devel] [Embedded-pv-devel] Migrated from Xenserver to Gentoo/Xen

[Adam Goryachev <mailinglists@xxxxxxxxxxxxxxxxxxxxxx>]

On 26/05/17 08:08, Paul Durrant wrote:
> > -----Original Message-----
> > From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxx] On Behalf Of
> > Andrii Anisov
> > Sent: 25 May 2017 04:28
> > To: Keith Hamilton <keith@xxxxxxxxxxxxxxxx>; xen-devel <xen-
> > devel@xxxxxxxxxxxxxxxxxxxx>
> > Cc: embedded-pv-devel@xxxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] [Embedded-pv-devel] Migrated from Xenserver to
> > Gentoo/Xen
> >
> > Dear Keith,
> >
> >
> > On 25.05.17 04:19, Keith Hamilton wrote:
> > > Hey guys.  I just migrated the first of 2 servers from XenServer into
> > > a Gentoo/Xen environment.  I’m really excited and it’s working great!
> > > However I’m not sure if I’m doing the drivers correctly.  On my Server
> > > 2016 vm I am having a hard time overwriting the XenServer PV drivers
> > > with the Xen ones from the website it just says that the driver is up
> > > to date.  I’m just wondering if I should worry that I don’t have the
> > > PV drivers installed from the Xen site and the XenServer ones are
> > > going to be ok.  I’m not sure what to do. I did a save state and then
> > > did a clean install of my 2016 server with no change.  I have gone
> > > into device manager and removed the XenServer Bus interface and a
> > > couple others in hopes to be able to install the ones from the
> > > XenProject site but it just renders the system unbootable.
> That's not entirely surprising. Removing Windows drivers is not an easy thing 
> to do and not something that Microsoft really support. You're safest just 
> leaving XenServer drivers in place as they are largely the same as the Xen 
> Project drivers.
> What has probably happened is that, by removing the bus driver you have 
> prevented the PV storage driver from coming on line, but all the infrastructure 
> is still in place to unplug your emulated storage device. Thus you no longer 
> have a system disk and you get a 0x7b BSOD.
>
> > >   I guess my
> > > question is, is there any simple way to remove the XenServer PV
> > > drivers on my 2016 server so that I can install the proprietary Xen PV
> > > drivers without having to do a complete format of the system.  I have
> > > already uninstalled all the citrix stuff I had installed..
> > >
> > > == Keith
I'm not sure if this will help you or anybody else, but the process I 
followed to move from xen 4.1.6 to 4.8.1 on windows 2012R2 was:
1) add gnttab_max_frames=128 to my dom0 GRUB_CMDLINE_XEN so that the 
network driver would work within the VM (otherwise you need to 
disable/enable it from windows each bootup). This is on the 4.8.1 xen.
2) shutdown the VM, take a snapshot (backup)
3) bootup on new server, wait for it to fail to boot, and auto-reboot
4) choose startup options
5) start in safe mode
6) un-install old drivers (from control panel/programs
7) run the winpv uninstall script that you were supposed to use to 
uninstall v10 drivers (was using v11)
8) install each of the new xen project win pv drivers (if any fail, 
retry, if they fail again, ignore and continue)
9) reboot normally
10) reinstall any drivers that failed from step 7, and reboot
11) Fix any network card settings (ie, static IP/DNS/etc) on the network 
card in the VM
Now I imagine most of the above would be similar on win2016, and moving 
from XenServer to Xen, basically bootup in safe mode, uninstall old 
drivers, install new drivers.
If you find a process that works, please share it, I'm sure many other 
people will be interested in future.
Regards,
Adam
--
Adam Goryachev Website Managers www.websitemanagers.com.au

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