On Wed, Feb 14, 2018 at 11:10:55AM +0000, Andrew Cooper wrote: > DO_OVERWRITE_RSB clobbers %rax, meaning in practice that that the bti_ist_info > field gets zeroed. Older versions of this code had the DO_OVERWRITE_RSB > register selectable, so reintroduce this ability and use it to cause the > INTR_IST path to use %rdx instead. > > The use of %dl for the %cs.rpl check means that when an IST interrupt hits > Xen, we try to load 1 into the high 32 bits of MSR_SPEC_CTRL, suffering a #GP > fault instead. > > Also, drop an unused label which was a copy/paste mistake. > > Reported-by: Boris Ostrovsky <boris.ostrov...@oracle.com> > Reported-by: Zhenzhong Duan <zhenzhong.d...@oracle.com> > Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Wei Liu <wei.l...@citrix.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
