我的 virt manager 出了点问题。当我勾选“复制主机配置”或写入host-passthrough"并启动虚拟机时，CPU 模型会自动恢复为EPYC-IBPBCPU。
如果我编辑 xml，这是相同的，但它并没有被编辑。
我的配置：
- 锐龙 3700X
- Nvidia GTX 1060 3GB
- AMD Radeon HD 7950（GPU 直通）
- 16Gb 内存（3000Mhz，CAS 15）
- Debian Sid
我的xml如下：
<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>
答案1
QEMU 不知道您的 Ryzen CPU。
它会回退到它支持的最新 AMD CPU，即 Epyc CPU。
由于 Epyc 或多或少是 Ryzen 系列的直接祖先，因此这将起作用，尽管一些新的 Ryzen 特定 CPU 功能将不可用。
如果您在 VM 中确实需要这些功能，则必须使用其他虚拟化产品。
更多详细信息请参阅 Qemu 手册这里