> From: Andrew Cooper <andrew.coop...@citrix.com>
> Sent: Monday, April 20, 2020 10:59 PM
>
> This will cause all SYSCALL/SYSRET instructions to suffer #UD rather than
> following the MSR_{L,C}STAR pointers, allowing us to drop the star_enter()
> panic helper, allowing us to clean up the IST stacks in a subsequent patch.
>
> Drop the now-dead conditional SYSENTER logic in the middle of
> subarch_percpu_traps_init().
>
> In addition, vmx_restore_host_msrs() need not restore any host
> state. (Regarding the asymmetric changes, VT-x automatically restores
> SYSENTER state on vmexit, and SVM restores both SYSCALL/SYSENTER state
> with
> the VMSAVE/VMLOAD instructions.)
>
> Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Reviewed-by: Kevin Tian <kevin.t...@intel.com>
