Hi all,
I start a VM in openstack, and openstack use libvirt to start qemu VM, but now log show this ERROR.
Is there any one know this?
The ERROR log from /var/log/libvirt/qemu/instance-0000000e.log
```
2023-03-14T10:09:17.674114Z qemu-system-x86_64: kvm_set_user_memory_region: KVM_SET_USER_MEMORY_REGION failed, slot=4, start=0xfffffffffe000000, size=0x2000: Invalid argument
kvm_set_phys_mem: error registering slot: Invalid argument
2023-03-14 10:09:18.198+0000: shutting down, reason=crashed
```
The xml file
```
root@c1c2:~# cat /etc/libvirt/qemu/instance-0000000e.xml
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
virsh edit instance-0000000e
or other application using the libvirt API.
-->
<domain type='kvm'>
<name>instance-0000000e</name>
<uuid>ff91d2dc-69a1-43ef-abde-c9e4e9a0305b</uuid>
<metadata>
<nova:instance xmlns:nova="
http://openstack.org/xmlns/libvirt/nova/1.1">
<nova:package version="25.1.0"/>
<nova:name>provider-instance</nova:name>
<nova:creationTime>2023-03-14 10:09:13</nova:creationTime>
<nova:flavor name="cirros-os-dpu-test-1">
<nova:memory>64</nova:memory>
<nova:disk>1</nova:disk>
<nova:swap>0</nova:swap>
<nova:ephemeral>0</nova:ephemeral>
<nova:vcpus>1</nova:vcpus>
</nova:flavor>
<nova:owner>
<nova:user uuid="ff627ad39ed94479b9c5033bc462cf78">admin</nova:user>
<nova:project uuid="512866f9994f4ad8916d8539a7cdeec9">admin</nova:project>
</nova:owner>
<nova:root type="image" uuid="9e58cb69-316a-4093-9f23-c1d1bd8edffe"/>
<nova:ports>
<nova:port uuid="77c1dc00-af39-4463-bea0-12808f4bc340">
<nova:ip type="fixed" address="172.1.1.43" ipVersion="4"/>
</nova:port>
</nova:ports>
</nova:instance>
</metadata>
<memory unit='KiB'>65536</memory>
<currentMemory unit='KiB'>65536</currentMemory>
<vcpu placement='static'>1</vcpu>
<sysinfo type='smbios'>
<system>
<entry name='manufacturer'>OpenStack Foundation</entry>
<entry name='product'>OpenStack Nova</entry>
<entry name='version'>25.1.0</entry>
<entry name='serial'>ff91d2dc-69a1-43ef-abde-c9e4e9a0305b</entry>
<entry name='uuid'>ff91d2dc-69a1-43ef-abde-c9e4e9a0305b</entry>
<entry name='family'>Virtual Machine</entry>
</system>
</sysinfo>
<os>
<type arch='x86_64' machine='pc-i440fx-6.2'>hvm</type>
<boot dev='hd'/>
<smbios mode='sysinfo'/>
</os>
<features>
<acpi/>
<apic/>
<vmcoreinfo state='on'/>
</features>
<cpu mode='host-model' check='partial'>
<topology sockets='1' dies='1' cores='1' threads='1'/>
</cpu>
<clock offset='utc'>
<timer name='pit' tickpolicy='delay'/>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/var/lib/nova/instances/ff91d2dc-69a1-43ef-abde-c9e4e9a0305b/disk'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</disk>
<controller type='usb' index='0' model='piix3-uhci'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<interface type='hostdev' managed='yes'>
<mac address='fa:16:3e:aa:d9:23'/>
<source>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x5'/>
</source>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</interface>
<serial type='pty'>
<log file='/var/lib/nova/instances/ff91d2dc-69a1-43ef-abde-c9e4e9a0305b/console.log' append='off'/>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
</serial>
<console type='pty'>
<log file='/var/lib/nova/instances/ff91d2dc-69a1-43ef-abde-c9e4e9a0305b/console.log' append='off'/>
<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='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<audio id='1' type='none'/>
<video>
<model type='virtio' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x6'/>
</source>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</hostdev>
<memballoon model='virtio'>
<stats period='10'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</memballoon>
<rng model='virtio'>
<backend model='random'>/dev/urandom</backend>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</rng>
</devices>
</domain>
```