[PATCH 39 of 55] xen64: add pvop for swapgs

[Jeremy Fitzhardinge]

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@xxxxxxxxxx>
---
 arch/x86/xen/enlighten.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1076,6 +1076,9 @@
 	.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,


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