On 08/08/17 05:59, Andy Lutomirski wrote: > Xen's raw SYSCALL entries are much less weird than native. Rather > than fudging them to look like native entries, use the Xen-provided > stack frame directly. > > This lets us eliminate entry_SYSCALL_64_after_swapgs and two uses of > the SWAPGS_UNSAFE_STACK paravirt hook. The SYSENTER code would > benefit from similar treatment. > > This makes one change to the native code path: the compat > instruction that clears the high 32 bits of %rax is moved slightly > later. I'd be surprised if this affects performance at all. > > Signed-off-by: Andy Lutomirski <l...@kernel.org>
Reviewed-by: Juergen Gross <jgr...@suse.com> Tested-by: Juergen Gross <jgr...@suse.com> Thanks, Juergen
