> From: Jan Beulich > Sent: Thursday, February 25, 2016 8:28 PM > > >> > >> Pending confirmation on FIP register width by at least Intel, > >> Reviewed-by: Jan Beulich <jbeul...@suse.com> > > > > For Intel CPUs, FIP is 48-bits internally and newer CPUs have FPCSDS and > > thus we will always use the 64-bit save. > > Has Intel told you (but not us), or is this just based on experiments > you did, or re-stating what I've found from experimenting? >
Still wait for an internal clarification... but could I think this question is more for older CPUs which don't claim FPCSDS since otherwise no such trick is required with 64bit save/restore? Thanks Kevin _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
