On 18/01/2018 11:48, Li Qiang wrote: > > > But upon I update the centos guest, the host kvm/qemu has been updated. > > The IBPB_ENABLED and IBRS_ENABLED are both zero if I don't update the > > microcode in the guest. If I update the guest micorcode, the are both 1. > > What do you mean by "update the guest microcode"? Did you mean host? > > > No, here mean the guest. By overwrite guest's files in > /lib/firmware/intel-ucode/ directory and "echo 1 > > /sys/devices/system/cpu/microcode/reload" as Intel's instruction says. > The host's kvm and qemu has been got updated before this.
No, that has no effect. Paolo
