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>

3 files changed, 8 insertions, 7 deletions

diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h
index 94e518da9aa8..f1c4c33e4153 100644
--- a/drivers/lguest/lg.h
+++ b/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];
 
diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c
index f4f6df85bece..a87fca678c6b 100644
--- a/drivers/lguest/lguest_user.c
+++ b/drivers/lguest/lguest_user.c
@@ -131,6 +131,10 @@ static int lg_cpu_start(struct lg_cpu *cpu, unsigned id, unsigned long start_ip)
          * reference, it is destroyed before close() is called. */
         cpu->mm = get_task_mm(cpu->tsk);
 
+        /* We remember which CPU's pages this Guest used last, for optimization
+         * when the same Guest runs on the same CPU twice. */
+        cpu->last_pages = NULL;
+
         return 0;
 }
 
@@ -192,10 +196,6 @@ static int initialize(struct file *file, const unsigned long __user *input)
         if (err)
                 goto free_regs;
 
-        /* We remember which CPU's pages this Guest used last, for optimization
-         * when the same Guest runs on the same CPU twice. */
-        lg->last_pages = NULL;
-
         /* We keep our "struct lguest" in the file's private_data. */
         file->private_data = lg;
 
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index 10eab6748d84..f8dfdc9a3e5b 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -80,9 +80,9 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages)
          * same Guest we ran last time (and that Guest hasn't run anywhere else
          * meanwhile).  If that's not the case, we pretend everything in the
          * Guest has changed. */
-        if (__get_cpu_var(last_cpu) != cpu || lg->last_pages != pages) {
+        if (__get_cpu_var(last_cpu) != cpu || cpu->last_pages != pages) {
                 __get_cpu_var(last_cpu) = cpu;
-                lg->last_pages = pages;
+                cpu->last_pages = pages;
                 lg->changed = CHANGED_ALL;
         }