lguest: cache last cpu we ran on.

This optimizes the frobbing of our Switcher map.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h
index 005929a3fd5..2eef40be4c0 100644
--- a/drivers/lguest/lg.h
+++ b/drivers/lguest/lg.h
@@ -17,6 +17,7 @@
 struct pgdir {
 	unsigned long gpgdir;
 	bool switcher_mapped;
+	int last_host_cpu;
 	pgd_t *pgdir;
 };