Ran into this when trying to set up a Win 7 with GPU passthrough. QEMU 4.0.0 has a regression which seems to affect Windows 7 guests. This causes the timing of the guest to be sped up 5-10x.
The Red Hat bug report is here: https://bugzilla.redhat.com/show_bug.cgi?id=1704375
With additional details and some work arounds here:
https://bugs.launchpad.net/qemu/+bug/1826422
https://bbs.archlinux.org/viewtopic.php?id=246835
QEMU 4.1.0 appears to have been patched, and the patch was backported to 4.0.1.
If you are trying to run a Windows 7 guest and the clock seems to be going really really fast, this could be the problem.
Related thread: https://forum.proxmox.com/threads/vm-w-pcie-passthrough-not-working-after-upgrading-to-6-0.56021/
The Red Hat bug report is here: https://bugzilla.redhat.com/show_bug.cgi?id=1704375
With additional details and some work arounds here:
https://bugs.launchpad.net/qemu/+bug/1826422
https://bbs.archlinux.org/viewtopic.php?id=246835
QEMU 4.1.0 appears to have been patched, and the patch was backported to 4.0.1.
If you are trying to run a Windows 7 guest and the clock seems to be going really really fast, this could be the problem.
Related thread: https://forum.proxmox.com/threads/vm-w-pcie-passthrough-not-working-after-upgrading-to-6-0.56021/
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