Hello,
After defining hugepages, as documented at
https://libvirt.org/formatdomain.html#memory-backing ,
when I start the guest, I get a dialogue
box that says:
Error starting domain: internal error: qemu unexpectedly
closed the monitor: 2022-02-20T01:10:36.520955Z
qemu-system-x86_64: Memory backend 'pc.ram' not found
Traceback (most recent call last):
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65,
in cb_wrapper
callback(asyncjob, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/asyncjob.py", line 101,
in tmpcb
callback(*args, **kwargs)
File
"/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 57,
in newfn
ret = fn(self, *args, **kwargs)
File "/usr/share/virt-manager/virtManager/object/domain.py", line
1329, in startup
self._backend.create()
File "/usr/lib64/python3.9/site-packages/libvirt.py", line 1353,
in create
raise libvirtError('virDomainCreate() failed'
After backing out changes, guest starts normally.
I searched online for the error message, but found nothing useful.
The hypervisor is running libvirtd (libvirt) 7.8.0 and QEMU emulator
version 6.1.0,
both build from source. I've got plenty of hugepages available.
The domain's XML definition is attached.
Any ideas where to look next?
Thanks,
--
Charles Polisher
<domain type="kvm">
<name>slacky-0</name>
<uuid>4a67eb39-9b92-8b8a-97ba-7e1250d56b07</uuid>
<title>slacky-0</title>
<description>elided</description>
<memory unit="KiB">4194304</memory>
<currentMemory unit="KiB">4194304</currentMemory>
<memoryBacking>
<hugepages>
<page size="4194304" unit="KiB"/>
</hugepages>
</memoryBacking>
<vcpu placement="static">2</vcpu>
<os>
<type arch="x86_64" machine="pc-i440fx-5.1">hvm</type>
<bootmenu enable="no"/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<cpu mode="custom" match="exact" check="none">
<model fallback="forbid">kvm64</model>
</cpu>
<clock offset="utc"/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type="file" device="cdrom">
<driver name="qemu" type="raw"/>
<target dev="hdc" bus="ide"/>
<readonly/>
<address type="drive" controller="0" bus="1" target="0" unit="0"/>
</disk>
<disk type="file" device="disk">
<driver name="qemu" type="qcow2" cache="writethrough"/>
<source file="/mnt/nvme1/VIRTUAL_MACHINES/slacky-0.qcow2"/>
<target dev="vda" bus="virtio"/>
<boot order="1"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x09" function="0x0"/>
</disk>
<controller type="usb" index="0" model="ich9-ehci1">
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x7"/>
</controller>
<controller type="usb" index="0" model="ich9-uhci1">
<master startport="0"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x0" multifunction="on"/>
</controller>
<controller type="usb" index="0" model="ich9-uhci2">
<master startport="2"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x1"/>
</controller>
<controller type="usb" index="0" model="ich9-uhci3">
<master startport="4"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x05" function="0x2"/>
</controller>
<controller type="ide" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x1"/>
</controller>
<controller type="virtio-serial" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x07" function="0x0"/>
</controller>
<controller type="scsi" index="0" model="virtio-scsi">
<address type="pci" domain="0x0000" bus="0x00" slot="0x08" function="0x0"/>
</controller>
<controller type="pci" index="0" model="pci-root"/>
<interface type="network">
<mac address="52:54:00:c3:93:40"/>
<source network="default"/>
<model type="virtio"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x0"/>
</interface>
<serial type="file">
<source path="/tmp/myconsoleoutput.txt"/>
<target type="isa-serial" port="0">
<model name="isa-serial"/>
</target>
</serial>
<console type="file">
<source path="/tmp/myconsoleoutput.txt"/>
<target type="serial" port="0"/>
</console>
<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="spice" autoport="yes" listen="127.0.0.1">
<listen type="address" address="127.0.0.1"/>
</graphics>
<sound model="ich9">
<address type="pci" domain="0x0000" bus="0x00" slot="0x04" function="0x0"/>
</sound>
<audio id="1" type="spice"/>
<video>
<model type="qxl" ram="65536" vram="65536" vgamem="16384" heads="1" primary="yes"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0"/>
</video>
<memballoon model="virtio">
<address type="pci" domain="0x0000" bus="0x00" slot="0x06" function="0x0"/>
</memballoon>
</devices>
</domain>
