Re: Fedora 26 qemu breaks Win10 guests

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On Tue, 2017-07-11 at 18:08 -0400, Sam Varshavchik wrote:
> Patrick O'Callaghan writes:
> 
> > On Tue, 2017-07-11 at 13:21 -0400, Sam Varshavchik wrote:
> > > Upgraded F25 that had a Win10 guest VM to F26.
> > > 
> > > When the VM got started, the initial logo and the spinning circle came up,
> > > but then the display cleared to what appears to be the VGA 648x480
> > > resolution, with gray vertical lines and something else.
> > > 
> > > After a few minutes of this I force-rebooted the VM. Windows 10 went into
> > > "Automatic Repair", then gave up, reporting some corrupted file. It didn't
> > > find any restore points either.
> > > 
> > > So, I'm now reinstalling it from a recovery disk. I have no idea if the
> > > restored image will come up…
> > 
> > Anything further on this? I expect to update to F26 tomorrow and also
> > have a Win10 VM under QEMU/KVM. I'll backup the VM (from Windows) and
> > probably take a QCOW snapshot of the virtual disk just in case, but I'd
> > be interested to know if:
> > 
> > * You're running X11 or Wayland
> > * Your virtual display is QXL, passthrough of a second GPU, or
> > something else
> > * You use VNC or Spice
> 
> QXL, X11, Spice.
> 
> I was able to reinstall Windows 10 on the same VM, and isolated one clue. A  
> VM-initiated reboot always fails, goes into "Preparing Automatic Repair",  
> then bluescreens and tells me that something is corrupted (I forget the  
> details), and there are no available restore points.
> 
> But this is a bald-faced lie. But if I force off, and boot again, Windows 10  
> comes up like there's nothing wrong. Normal boot.

Just tried it and it worked perfectly. Did you shut down your Windows
VM before the upgrade?

> This continued to happen after a fresh Windows 10 install. If I initiate a  
> reboot from the Start menu, I don't even see the bios screen flash by. The  
> stupid thing immediately lands into "Preparing Automatic Repair". But a full  
> shutdown and a boot is fine.
> 
> In hindsight, post-upgrade, my VM was probably ok, but it led me to believe  
> that it was bricked, leading me to wipe everything and reinstall. It was  
> very convincing. I am not amused.

What you describe sounds very similar to something I saw a couple of
months ago while playing with device configurations under libvirt-
manager. I got the BSOD several times and resorted to a reinstall, but
on reflection I think the problem was due to a lack of drivers in
Windows (virtio-scsi or something, I forget) and the fact that I hadn't
mounted a pseudo-ISO driver CD when trying to boot it.

poc
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