>>> On 03.12.18 at 17:18, <andrew.coop...@citrix.com> wrote: > The semantics of MSR_VIRT_SPEC_CTRL are that unknown bits are write-discard > and read as zero. Only VIRT_SPEC_CTRL.SSBD is defined at the moment. > > To facilitate making this per-guest, the legacy SSBD state needs context > switching between vcpus. amd_ctxt_switch_legacy_ssbd() is updated to take the > vcpus setting into account. Furthermore, the guests chosen value needs > preserving across migrate. > > This marks a subtle change in how `ssbd=` behaves. If Xen wishes SSBD to be > asserted, it remains set in hardware all the time. In the default case of Xen > wishing SSBD not to be asserted, the value set in hardware is the guests > choice. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Jan Beulich <jbeul...@suse.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
