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 9d94483b3b5e9c1877438c091a2a637b67b1460d..8b60982e457aeb0e4bd73f85e86433f8c56fa05f 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,