Re: [Qemu-devel] What's needed to pass pciid cpu flag to guest?

[Manu]

> Am 08.01.2018 um 19:58 schrieb Stefan Priebe - Profihost AG <address@hidden>:
> 
> 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

$ qemu -cpu help 
gives a overview.

+pcid

should do it.

> 
> Qemu is 2.9.1
> 
> Thanks!
> 
> Greets,
> Stefan
>