Additional info:
I'm not advocating for any specific Hyper-V enlightenments to be enabled, but I suspect the current defaults are sub-optimal and I would be willing to help improve them. Is there a process for evaluating which to enable, or is it simply a matter of adding defaults for features which weren't available previously?
Description of problem:
virt-install currently enables hv-time, hv-relaxed, hv-vapic, hv-spinlocks= 0x1fff for guests which support Hyper-V. There are several additional Hyper-V enlightenments supported by QEMU and libvirt (see https:/ /github. com/qemu/ qemu/blob/ master/ docs/hyperv. txt and https:/ /libvirt. org/formatdomai n.html# elementsFeature s) which could be useful to enable. In particular, hv_stimer significantly reduces CPU usage when supporting VMs are paused (see https:/ /lore.kernel. org/kvm/ 20200625201046. GA179502@ kevinolos/).
Version-Release number of selected component (if applicable): 2.2.1/master
How reproducible: 100%
Steps to Reproduce:
1. virt-install --os-variant win10 --print-xml
Actual results:
<hyperv>
<relaxed state="on"/>
<vapic state="on"/>
<spinlocks state="on" retries="8191"/>
</hyperv>
Expected results:
Something more like:
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state="on" retries="8191"/>
<vpindex state='on'/>
<runtime state='on'/>
<synic state='on'/>
<stimer state='on'/>
<frequencies state='on'/>
<tlbflush state='on'/>
<ipi state='on'/>
</hyperv>
Additional info:
I'm not advocating for any specific Hyper-V enlightenments to be enabled, but I suspect the current defaults are sub-optimal and I would be willing to help improve them. Is there a process for evaluating which to enable, or is it simply a matter of adding defaults for features which weren't available previously?
Thanks,
Kevin