>>> On 03.12.18 at 17:18, <andrew.coop...@citrix.com> wrote: > This is a lingering TODO item from XSA-263. It adds support AMD's > MSR_VIRT_SPEC_CTRL interface, and changes Xen's "boot time global" SSBD > setting into a per-vcpu setting. > > This can be found on: > git://xenbits.xen.org/people/andrewcoop/xen.git xen-virt-spec-ctrl-v1 > > The start of the series is some cleanup. It then teaches Xen to recognise the > available interfaces (including MSR_VIRT_SPEC_CTRL from a hypervisor), then > how to safely context switch the per-core LS_CFG on Fam17h, an finally to > expose support to guests. > > I've got some further MSR work coming because we have to fix the > default-leakiness of MSRs in this range, because a guest becomes unsafe to > migrate as soon as it reads any of the pipeline control MSRs.
I've seen you mention this elsewhere, but I'm still unclear about the "why" part here. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
