On Thu, Apr 07, 2016 at 12:57:26PM +0100, Andrew Cooper wrote: > The existing logic is broken for heterogeneous migration. By always > advertising the host maximum xstate, a migration to a less capable host always > fails as Xen cannot accomodate the xcr0_accum in the migration stream. > > By calculating xstate from the feature information (which a multi-host > toolstack will have levelled appropriately), the guest will have the current > hosts maximum xstate advertised, allowing for correct migration to less > capable hosts. > > In addition, some further improvements and corrections: > - don't discard the known flags in sub-leaves 2..63 ECX > - zap sub-leaves beyond 62 > - zap all bits in leaf 1, EBX/ECX. No XSS features are currently supported. > > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com> > Signed-off-by: Jan Beulich <jbeul...@suse.com>
Since this is mostly x86 code and signed off by two x86 maintainers, I'm just rubber-stamping this patch: Acked-by: Wei Liu <wei.l...@citrix.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
