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