I think it's not exposed in current cpu model it can be enabled with "+pcid"
I don't known what it's the best way to add it in proxmox. We could do it with qemu version upgrade, but qemu 2.10 are not ready. Maybe add new cpumodel with +pcid enabled ? or add code to manage custom cpuflags and add a checkbox in cpu options ? ----- Mail original ----- De: "Stefan Priebe, Profihost AG" <s.pri...@profihost.ag> À: "pve-devel" <pve-devel@pve.proxmox.com> Envoyé: Lundi 8 Janvier 2018 21:34:57 Objet: [pve-devel] cpuflag: pcid needed in guest for good performance after meltdown Hello, for meltdown mitigation and performance it's important to have the pcid flag passed down to the guest (f.e. https://groups.google.com/forum/m/#!topic/mechanical-sympathy/L9mHTbeQLNU). My host shows the flag: # grep ' pcid ' /proc/cpuinfo | wc -l 56 But the guest does not: # grep pcid /proc/cpuinfo # Guest was started with: -cpu IvyBridge,+kvm_pv_unhalt,+kvm_pv_eoi,enforce,vendor=GenuineIntel Is this something missing in host kernel or in PVE? Greets, Stefan _______________________________________________ pve-devel mailing list pve-devel@pve.proxmox.com https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel _______________________________________________ pve-devel mailing list pve-devel@pve.proxmox.com https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
