Red Hat ENTERPRISE LINUX 5.5 - S 2010, Руководство пользователя

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kvm
321
• the kvm package has incorrect dependencies related to the
libgcrypt
package. Consequently,
if the
libgcrypt
package installed on a system is earlier than version 1.4.4, the
qemu-kvm
process may refuse to start, returning a
libgcrypt initialization error
message. To work
around this issue, update
libgcrypt
to the version provided by Red Hat Enterprise Linux 5.5.
(BZ#503118)
102
• The KVM modules available in the
kmod-kvm
package are loaded automatically at boot time if the
kmod-kvm package is installed. To make these KVM modules available after installing the
kmod-
kvm
package the system either needs to be rebooted or the modules can be loaded manually by
running the
/etc/sysconfig/modules/kvm.modules
script.
(BZ#501543)
103
• Some Linux-based guests that use virtio virtual block devices may abort during installation, returning
the error message: unhandled vm exit: 0x31 vcpu_id 0 To work around this issue, consider utilizing
a different interface (other than virtio) for the guest virtual disk.
(BZ#518081)
104
• RHEL5.x virtualization relies on etherboot for remote booting. Etherboot is an implementation of the
pxe standard, but lacks some features that are present in the new gpxe boot technology which is not
shipped with RHEL. It is possible to use the gpxe roms with RHEL 5.4. As an example, gpxe roms
can be used to interpret requests generated by Microsoft RIS or WDS. All components present in
RHEL5.4 are capable of booting gpxe roms. The roms can be obtained directly from http://rom-o-
matic.net/, or other sources like the Fedora Project.
BZ#509208
105
• The Preboot eXecution Environment (PXE) boot ROMs included with KVM are from the Etherboot
project. Consequently, some bug fixes or features that are present on the newer gPXE project
are not available on Etherboot. For example, Virtual Machines (VMs) cannot boot using Microsoft
based PXE (ie. Remote Installation Services (RIS) or Windows Deployment Services (WDS)).
(BZ#497692)
106
• The following QEMU / KVM features are currently disabled and not supported:
(BZ#512837)
107
• smb user directories
• scsi emulation
• "isapc" machine type
• nested KVM guests
• usb mass storage device emulation
• usb wacom tablet emulation
• usb serial emulation
• usb network emulation
• usb bluetooth emulation
• device emulation for vmware drivers
• sb16, es1370, and ac97 sound card emulation
• bluetooth emulation