xen64: add pvop for swapgs

swapgs is a no-op under Xen, because the hypervisor makes sure the
right version of %gs is current when switching between user and kernel
modes.  This means that the swapgs "implementation" can be inlined and
used when the stack is unsafe (usermode).  Unfortunately, it means
that disabling patching will result in a non-booting kernel...

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 9d94483..8b60982 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1076,6 +1076,9 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
        .set_iopl_mask = xen_set_iopl_mask,
        .io_delay = xen_io_delay,
 
+       /* Xen takes care of %gs when switching to usermode for us */
+       .swapgs = paravirt_nop,
+
        .lazy_mode = {
                .enter = paravirt_enter_lazy_cpu,
                .leave = xen_leave_lazy,