<html><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <div class="moz-cite-prefix">On 24/11/22 5:40 pm, Jiri Denemark wrote: </div> <blockquote type="cite" cite="mid:Y39fJrv3tQ1uU9Zq@orkuz.int.mamuti.net"> <pre class="moz-quote-pre" wrap="">On Wed, Nov 23, 2022 at 18:34:38 +0530, manish.mishra wrote: </pre> <blockquote type="cite"> <pre class="moz-quote-pre" wrap="">oh i see you meant something like this, <cpu mode='custom' match='exact' check='none'> <numa> <cell id='0' cpus='0-239' memory='8388608' unit='KiB' memAccess='shared'/> </numa> </cpu> <qemu:commandline> <qemu:arg value='-cpu'/> <qemu:arg value='enforce,Icelake-v4,x2apic=on,hv-time,kvm-pv-eoi=on'/> </qemu:commandline> </pre> </blockquote> <pre class="moz-quote-pre" wrap=""> This won't work as libvirt should add a default CPU model there and replace check='none' with check='full' once the domain starts. But we actually have a way to do what you need even without any change in libvirt: <cpu mode='host-passthrough' check='none'> <topology .../> <numa> ... </numa> ... </cpu> <qemu:commandline> <qemu:arg value='-cpu'/> <qemu:arg value='Icelake-Server-v4,enforce,x2apic=on,hv-time,kvm-pv-eoi=on'/> </qemu:commandline> This will result in -cpu host,migratable=on ... -cpu Icelake-Server-v4,enforce,x2apic=on,hv-time,kvm-pv-eoi=on and libvirt will not touch the check='none' attribute once the domain starts and it would not complain about any unknown CPU features or models as there's nothing to check in <cpu/>. That is, there's no need to come up with anything special to support passing arbitrary options to -cpu. Jirka</pre> </blockquote> Thank you so much Jirka, let me give this a try with few different cases. I will let you know how this goes <span style="font-size:13.999999999999998pt;font-family:Arial;color:#434343;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;" id="docs-internal-guid-55ae7445-7fff-c8ce-cc06-186ab7c3f11a">or if we need anything extra. <span style="font-size:13.999999999999998pt;font-family:Arial;color:#434343;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;" id="docs-internal-guid-55ae7445-7fff-c8ce-cc06-186ab7c3f11a">Thanks <span style="font-size:13.999999999999998pt;font-family:Arial;color:#434343;background-color:transparent;font-weight:400;font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre;white-space:pre-wrap;" id="docs-internal-guid-55ae7445-7fff-c8ce-cc06-186ab7c3f11a">Manish Mishra <blockquote type="cite" cite="mid:Y39fJrv3tQ1uU9Zq@orkuz.int.mamuti.net"> <pre class="moz-quote-pre" wrap=""> </pre> </blockquote> </body> </html>