On Wed, Jan 31, 2018 at 1:42 PM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > Can we just say it sucks to be L2 too? :) Because in the end as long as > no one ever writes to spec_ctrl, everybody is happy. Unfortunately, quite a few OS vendors shipped IBRS-based mitigations earlier this month. (Has Redhat stopped writing to IA32_SPEC_CTRL yet? :-) And in the long run, everyone is going to set IA32_SPEC_CTRL.IBRS=1 on CPUs with IA32_ARCH_CAPABILITIES.IBRS_ALL.
