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| layout | title | permalink |
|---|---|---|
| doc | HVM Troubleshooting | /doc/hvm-troubleshooting/ |
HVM Troubleshooting
HVM pauses on boot, followed by kernel error
The HVM may pause on boot, showing a fixed cursor. After a while a series of warnings may be shown similar to this:
BUG: soft lockup - CPU#0 stuck for 23s! [systemd-udevd:244]
To fix this:
- Kill the HVM.
- Start the HVM
- Press "e" at the grub screen to edit the boot parameters
- Find the /vmlinuz line, and edit it to replace "rhgb" with "modprobe.blacklist=bochs_drm"
- Press "Ctrl-x" to start the HVM
If this solves the problem then you will want to make the change permanent:
- Edit the file
/etc/default/grub. - Find the line which starts:
GRUB_CMDLINE_LINUX= - Remove this text from that line:
rhgb - Add this text to that line:
modprobe.blacklist=bochs_drm - Run this command:
grub2-mkconfig --output=/boot/grub2/grub.cfg
The HVM should now start normally.
Can't start an OS in an HVM / "Probing EDD (edd=off to disable!... ok" message
If you see a screen popup with SeaBios and 4 lines, last one being Probing EDD (edd=off to disable!... ok, then enter the following command from a dom0 prompt:
qvm-prefs <HVMname> kernel ""
HVM crashes when booting from ISO
If your HVM crashes when trying to boot an ISO, first ensure that qvm-prefs <HVMname> kernel is empty, as shown above.
If this doesn't help, then disable memory balancing and set the minimum memory to 2GB.
You can disable memory-balancing in the settings, under the “Advanced” tab.
To give the VM a RAM of 2GB, open a terminal in dom0 and enter:
qvm-prefs <HVMname> memory 2000
Attached devices in Windows HVM stop working on suspend/resume
After the whole system gets suspended into S3 sleep and subsequently resumed, some attached devices may stop working. To know how to make the devices work, see Suspend/resume Troubleshooting.