On Tue, Jan 09, 2018 at 05:45:52PM +0100, Michael Rasmussen wrote: > On Tue, 9 Jan 2018 16:31:40 +0100 > Stefan Priebe - Profihost AG <s.pri...@profihost.ag> wrote: > > > > > Thanks! I would love to see it as a default for the specific qemu cpu > > models. > > > > I mean we know exactly that sandybridge, ivybridge, ... support it or not? > > > Is this an Intel only cpu flag? > > lscpu |grep Model > Model: 2 > Model name: AMD Opteron(tm) Processor 3350 HE > > grep pcid /proc/cpuinfo >
yes. it's an Intel CPU feature, and only needed to reduce the performance impact of KPTI, which is a mitigation for a bug affecting Intel CPUs (and some ARM). since KPTI is disabled unless manually forced on AMD CPUs, the fact that there is no PCID does not matter there ;) similar changes with other CPU features will be needed for the Spectre mitigation patches which will probably be finalized upstream soon, those will affect AMD as well. _______________________________________________ pve-devel mailing list pve-devel@pve.proxmox.com https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
