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--- software:linux:kvm [2012/09/04 14:18] – external edit 127.0.0.1
+++ software:linux:kvm [2024/05/20 21:44] (current) – Michele Porelli
@@ Line 1: / Line 1: @@
 ====== KVM ======
 KVM (for Kernel-based Virtual Machine) is a full virtualization solution for Linux on x86 hardware containing virtualization extensions (Intel VT or AMD-V).
+==== Useful virsh commands ====
+  * rescan default pool for new images:<code>pool-refresh default</code>
+==== How-tos ====
+  * move from ZVOL to standard qcow2 image:<code>qemu-img convert -p -f raw -O qcow2 /dev/zvol/YOUR_ZVOL /your/image.qcow2</code>
+=== Extract SLIC and use it for your VM ===
+credits: [[https://gist.github.com/Informatic/49bd034d43e054bd1d8d4fec38c305ec|1]]
+  * extract slic from donor<code>#!/bin/bash
+set -e
+cat /sys/firmware/acpi/tables/SLIC > slic.bin
+cat /sys/firmware/acpi/tables/MSDM > msdm.bin
+dmidecode -t 0 -u | grep $'^\t\t[^"]' | xargs -n1 | perl -lne 'printf "%c", hex($_)' > smbios_type_0.bin
+dmidecode -t 1 -u | grep $'^\t\t[^"]' | xargs -n1 | perl -lne 'printf "%c", hex($_)' > smbios_type_1.bin</code>
+  * apply to your kvm xml<code><domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
+  <!-- ... -->
+  <qemu:commandline>
+    <qemu:arg value='-acpitable'/>
+    <qemu:arg value='file=/some/path/slic.bin'/>
+    <qemu:arg value='-acpitable'/>
+    <qemu:arg value='file=/some/path/msdm.bin'/>
+    <qemu:arg value='-smbios'/>
+    <qemu:arg value='file=/some/path/smbios_type_0.bin'/>
+    <qemu:arg value='-smbios'/>
+    <qemu:arg value='file=/some/path/smbios_type_1.bin'/>
+  </qemu:commandline>
+</domain></code>
+==== Quirks ====
+=== High CPU usage with Windows ===
+virt-manager doesn't pick the best options for the clock and, as consequence, the CPU usage is quite high.
+Replace the clock section with:
+<code>
+  <clock offset='localtime'>
+    <timer name='hpet' present='yes'/>
+    <timer name='hypervclock' present='yes'/>
+  </clock>
+</code>
 ===== Links =====
+==== Microsoft signed drivers ====
+  * [[https://www.windowsservercatalog.com/results.aspx?&text=Red+Hat&bCatID=1282&cpID=0&avc=10&ava=130&avt=0&avq=0&OR=5&PGS=25&PG=1|Red Hat sponsored]]
 ==== Official distribution pages ====
   * [[https://wiki.archlinux.org/index.php/KVM|Arch Linux KVM page]]