Installation guide

Chapter 34. Troubleshooting
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initrd /initrd-2.6.32-36.x86-64.img
Reboot the guest.
On the host, access the serial console with the following command:
# virsh console
You can also use virt-manager to display the virtual text console. In the guest console window,
select Serial Console from the View menu.
34.5. Virtualization log files
• /var/log/libvirt/qemu/GuestName.log
If you encounter any errors with the Virtual Machine Manager, you can review the generated data in
the virt-manager.log file that resides in the /.virt-manager directory. Note that every time
you start the Virtual Machine Manager, it overwrites the existing log file contents. Make sure to backup
the virt-manager.log file, before you restart the Virtual Machine manager after a system error.
34.6. Loop device errors
If file-based guest images are used you may have to increase the number of configured loop devices.
The default configuration allows up to eight active loop devices. If more than eight file-based guests
or loop devices are needed the number of loop devices configured can be adjusted in /etc/
modprobe.conf. Edit /etc/modprobe.conf and add the following line to it:
options loop max_loop=64
This example uses 64 but you can specify another number to set the maximum loop value. You may
also have to implement loop device backed guests on your system. To use a loop device backed
guests for a full virtualized system, use the phy: device or file: file commands.
34.7. Enabling Intel VT and AMD-V virtualization hardware
extensions in BIOS
This section describes how to identify hardware virtualization extensions and enable them in your
BIOS if they are disabled.
The Intel VT extensions can be disabled in the BIOS. Certain laptop vendors have disabled the Intel
VT extensions by default in their CPUs.
The virtualization extensions cannot be disabled in the BIOS for AMD-V.
The virtualization extensions are sometimes disabled in BIOS, usually by laptop manufacturers. Refer
to the following section for instructions on enabling disabled virtualization extensions.
Verify the virtualization extensions are enabled in BIOS. The BIOS settings for Intel® VT or AMD-
V are usually in the Chipset or Processor menus. The menu names may vary from this guide, the
virtualization extension settings may be found in Security Settings or other non standard menu
names.
Procedure 34.1. Enabling virtualization extensions in BIOS
1. Reboot the computer and open the system's BIOS menu. This can usually be done by pressing
the delete key, the F1 key or Alt and F4 keys depending on the system.