At 07:52 -0700 on 25 Feb (1456386721), Jan Beulich wrote: > >>> On 17.02.16 at 17:35, <jbeul...@suse.com> wrote: > > All branches need to #GP when their target violates the segment limit > > (in 16- and 32-bit modes) or is non-canonical (in 64-bit mode). For > > near branches facilitate this via a zero-byte instruction fetch from > > the target address (resulting in address translation and validation > > without an actual read from memory), while far branches get dealt with > > by breaking up the segment register loading into a read-and-validate > > part and a write one. The latter at once allows correcting some > > ordering issues in how the individual emulation steps get carried out: > > Before updating machine state, all exceptions unrelated to that state > > updating should have got raised (i.e. the only ones possibly resulting > > in partly updated state are faulting memory writes [pushes]). > > > > Note that while not immediately needed here, write and distinct read > > emulation routines get updated to deal with zero byte accesses too, for > > overall consistency. > > > > Reported-by: å??令 <liuling...@360.cn> > > Signed-off-by: Jan Beulich <jbeul...@suse.com>
Sorry, hadn't spotted the shadow change. Acked-by: Tim Deegan <t...@xen.org> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
