Super User Asked by Binary_Serox on December 9, 2021
I have a problem with virt manager. When I tick "copy host configuration" or write host-passthrough" and I start the VM, the CPU model returns automatically to EPYC-IBPB CPU.
And if I edit the xml, this is the same, but it is not edited.
My configuration:
And my xml:
<domain type="kvm">
<name>win10</name>
<uuid>2bc5436e-dd21-4c0b-bed3-938585a892f5</uuid>
<metadata>
<libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
<libosinfo:os id="http://microsoft.com/win/10"/>
</libosinfo:libosinfo>
</metadata>
<memory unit="KiB">8192000</memory>
<currentMemory unit="KiB">8192000</currentMemory>
<vcpu placement="static">16</vcpu>
<os>
<type arch="x86_64" machine="pc-q35-5.0">hvm</type>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state="on"/>
<vapic state="on"/>
</hyperv>
<vmport state="off"/>
<ioapic driver="kvm"/>
</features>
<cpu mode="host-model" check="none"/>
<clock offset="localtime">
<timer name="rtc" tickpolicy="catchup"/>
<timer name="pit" tickpolicy="delay"/>
<timer name="hpet" present="no"/>
<timer name="hypervclock" present="yes"/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled="no"/>
<suspend-to-disk enabled="no"/>
</pm>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type="file" device="disk">
<driver name="qemu" type="qcow2" cache="none" io="native" discard="unmap"/>
<source file="/media/serox/Fichier/Vm/Win10kvm/win10.qcow2"/>
<target dev="vda" bus="virtio"/>
<boot order="2"/>
<address type="pci" domain="0x0000" bus="0x07" slot="0x00" function="0x0"/>
</disk>
<disk type="file" device="cdrom">
<driver name="qemu" type="raw"/>
<source file="/media/serox/Fichier/Os/Win10_1903_V2_French_x64.iso"/>
<target dev="sdb" bus="sata"/>
<readonly/>
<boot order="1"/>
<address type="drive" controller="0" bus="0" target="0" unit="1"/>
</disk>
<controller type="usb" index="0" model="qemu-xhci" ports="15">
<address type="pci" domain="0x0000" bus="0x02" slot="0x00" function="0x0"/>
</controller>
<controller type="sata" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x1f" function="0x2"/>
</controller>
<controller type="pci" index="0" model="pcie-root"/>
<controller type="pci" index="1" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="1" port="0x10"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0" multifunction="on"/>
</controller>
<controller type="pci" index="2" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="2" port="0x11"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x1"/>
</controller>
<controller type="pci" index="3" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="3" port="0x12"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x2"/>
</controller>
<controller type="pci" index="4" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="4" port="0x13"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x3"/>
</controller>
<controller type="pci" index="5" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="5" port="0x14"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x4"/>
</controller>
<controller type="pci" index="6" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="6" port="0x15"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x5"/>
</controller>
<controller type="pci" index="7" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="7" port="0x16"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x6"/>
</controller>
<controller type="pci" index="8" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="8" port="0x17"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x7"/>
</controller>
<controller type="pci" index="9" model="pcie-to-pci-bridge">
<model name="pcie-pci-bridge"/>
<address type="pci" domain="0x0000" bus="0x08" slot="0x00" function="0x0"/>
</controller>
<controller type="pci" index="10" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="10" port="0x18"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x0"/>
</controller>
<controller type="virtio-serial" index="0">
<address type="pci" domain="0x0000" bus="0x03" slot="0x00" function="0x0"/>
</controller>
<controller type="scsi" index="0" model="virtio-scsi">
<address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/>
</controller>
<interface type="network">
<mac address="52:54:00:43:2f:9e"/>
<source network="default"/>
<model type="virtio"/>
<address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>
<serial type="pty">
<target type="isa-serial" port="0">
<model name="isa-serial"/>
</target>
</serial>
<console type="pty">
<target type="serial" port="0"/>
</console>
<channel type="spicevmc">
<target type="virtio" name="com.redhat.spice.0"/>
<address type="virtio-serial" controller="0" bus="0" port="1"/>
</channel>
<input type="tablet" bus="usb">
<address type="usb" bus="0" port="1"/>
</input>
<input type="mouse" bus="ps2"/>
<input type="keyboard" bus="ps2"/>
<graphics type="vnc" port="-1" autoport="yes">
<listen type="address"/>
</graphics>
<graphics type="spice" autoport="yes">
<listen type="address"/>
<image compression="off"/>
<gl enable="no" rendernode="/dev/dri/by-path/pci-0000:2d:00.0-render"/>
</graphics>
<sound model="ich6">
<address type="pci" domain="0x0000" bus="0x09" slot="0x01" function="0x0"/>
</sound>
<video>
<model type="virtio" heads="1" primary="yes"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x0"/>
</video>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x23" slot="0x00" function="0x0"/>
</source>
<address type="pci" domain="0x0000" bus="0x05" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="usb" managed="yes">
<source>
<vendor id="0x8087"/>
<product id="0x0aa7"/>
</source>
<address type="usb" bus="0" port="5"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x23" slot="0x00" function="0x1"/>
</source>
<address type="pci" domain="0x0000" bus="0x0a" slot="0x00" function="0x0"/>
</hostdev>
<redirdev bus="usb" type="spicevmc">
<address type="usb" bus="0" port="2"/>
</redirdev>
<redirdev bus="usb" type="spicevmc">
<address type="usb" bus="0" port="3"/>
</redirdev>
<memballoon model="virtio">
<address type="pci" domain="0x0000" bus="0x06" slot="0x00" function="0x0"/>
</memballoon>
</devices>
</domain>
QEMU doesn't know about your Ryzen CPU.
It falls back to the latest AMD CPU it does support which is the Epyc CPU.
As the Epyc is more or less a direct ancestor of the Ryzen series this will work, although a few of the new Ryzen-specific CPU features will not be available.
If you absolutely need those in the VM you will have to use another virtualization product.
More details are in the Qemu manual here
Answered by Tonny on December 9, 2021
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