Messages in this thread | | | Subject | Re: [PATCH v2] x86/xen/64: Rearrange the SYSCALL entries | From | Juergen Gross <> | Date | Wed, 9 Aug 2017 17:39:12 +0200 |
| |
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 <luto@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com> Tested-by: Juergen Gross <jgross@suse.com>
Thanks,
Juergen
| |