lguest: move last_pages to lg_cpu

in our new model, pages are assigned to a virtual cpu, not to a guest.
We move it to the lg_cpu structure.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/lguest/lg.h

@@ -57,6 +57,8 @@ struct lg_cpu {
 	unsigned long regs_page;
 	struct lguest_regs *regs;
 
+	struct lguest_pages *last_pages;
+
 	int cpu_pgd; /* which pgd this cpu is currently using */
 
 	/* If a hypercall was asked for, this points to the arguments. */
@@ -92,7 +94,6 @@ struct lguest
 
 	/* Bitmap of what has changed: see CHANGED_* above. */
 	int changed;
-	struct lguest_pages *last_pages;
 
 	struct pgdir pgdirs[4];