Installation guide

Warning
Due to interrupt tracking, repeatedly hotplugging or hotunplugging an assigned device more
than 512 times in a brief period of time can cause a kernel error. Please do not repeatedly
hotplug/hotunplug an assigned device.
Note
When running Red Hat Enterprise Linux 5 as a KVM guest, the acpiphp kernel module must
be loaded in the guest to support dynamic addition and removal of PCI devices. This module
enables the guest to receive insertion and removal notifications from qemu. To manually load
this module, run the following command in the guest:
# modprobe acpiphp
To enable this module to be loaded automatically on every guest boot, perform the following
commands in the guest:
# echo 'modprobe acpiphp' > /etc/sysconfig/modules/acpiphp.modules
# chmod +x /etc/sysconfig/modules/acpiphp.modules
After reboot, the module should be loaded and can be confirmed with the lsmod | grep
acpiphp command. More information on persistent module loading in Red Hat Enterprise
Linux 5 can be found in the Red Hat Enterprise Linux 5 Deployment Guide.
⁠Chapt er 1 5. PCI passt hrough
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