>>> On 13.02.17 at 16:26, <andrew.coop...@citrix.com> wrote: > On 13/02/17 15:19, Jan Beulich wrote: >>>>> On 13.02.17 at 15:32, <andrew.coop...@citrix.com> wrote: >>> Xen's choice of the MSR_STAR value is constant across all pcpus. Introduce >>> a >>> new define and use it to avoid the opencoding in subarch_percpu_traps_init() >>> and restore_rest_processor_state(). >>> >>> Despite Intel hardware having an MSR_CSTAR register, nothing actually uses >>> it >>> as the SYSCALL instruction raises #UD out of 64bit mode, meaning that >> Did you mean "32-bit"? > > SYSCALL on Intel will #UD if CS.L == 0, so you can't even use it from a > compatability mode segment.
Right - so my comment stands. Or did you mean "outside of 64-bit mode"? Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
