Package: qemu-kvm
Version: 1:3.1+dfsg-7 (QEMU 3.1.0 / Kernel 4.19)
Running Windows 10 guest build >= 1803 will give high host CPU usage (even
though it's close to null in client) if you don't enable HyperV synIC which
can i.a. be done in Virt XML:
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
* <synic state='on'/>*
<stimer state='on'/>
</hyperv>
But it seem only older machine types support this property.
I've tested the following machine types:
pc-i440fx-2.8 (OK)
pc-i440fx-3.0 (OK)
pc-i440fx-3.1 (Fail)
pc-q35-3.1 (Fail)
When starting the VM you get the error:
"error: internal error: process exited while connecting to monitor: Hyper-V
SynIC (requested by 'hv-synic' cpu flag) requires Hyper-V VP_INDEX
('hv-vpindex')
2019-08-06T13:29:14.114943Z qemu-system-x86_64: kvm_init_vcpu failed:
Function not implemented"
Attached a copy of a working XML. To reproduce just specify a newer machine
type e.g. "pc-i440fx-3.1". I assume you don't need a working Windows image
file, any qcow2 file will do.
https://bugzilla.redhat.com/show_bug.cgi?id=1738244
Best regards
Brian
<domain type='kvm'>
<name>W10_tmp1</name>
<uuid>eb67095c-f97b-4b98-8e88-635010602585</uuid>
<description>Win10</description>
<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'>2097152</memory>
<currentMemory unit='KiB'>2097152</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-3.0'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/OVMF/OVMF_CODE.fd</loader>
<nvram>/mnt/NVMe_OLD_ROOT/VMs/W10_tmpX.fd</nvram>
<boot dev='hd'/>
<boot dev='cdrom'/>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
<synic state='on'/>
<stimer state='on'/>
</hyperv>
</features>
<cpu mode='host-model' check='partial'>
<model fallback='allow'/>
</cpu>
<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/kvm</emulator>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='sda' bus='scsi'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none' discard='unmap'/>
<source file='/mnt/VMs/W10/disk1.qcow2'/>
<target dev='sdc' bus='scsi'/>
<address type='drive' controller='0' bus='0' target='0' unit='2'/>
</disk>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</controller>
<controller type='usb' index='0' model='qemu-xhci' ports='15'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</controller>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='scsi' index='0' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</controller>
<controller type='scsi' index='1' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:8f:98:46'/>
<source bridge='brLAN'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' 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='unix'>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='2'/>
</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='5901' autoport='no' listen='0.0.0.0' keymap='da' passwd='xxxx'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<video>
<model type='vga' vram='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='0x09' function='0x0'/>
</memballoon>
</devices>
</domain>
