lguest: don't share Switcher PTE pages between guests.

We currently use the whole top PGD entry for the switcher, so we
simply share a fixed page of PTEs between all guests (actually, it's
one per Host CPU, to ensure isolation between guests).

Changes to a scheme where every guest has its own mappings.

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

1 files changed, 1 insertions, 9 deletions

diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index b6c71c32308c..7e1d7ee36478 100644
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -333,15 +333,10 @@ static int __init init(void)
         if (err)
                 goto out;
 
-        /* Now we set up the pagetable implementation for the Guests. */
-        err = init_pagetables(lg_switcher_pages);
-        if (err)
-                goto unmap;
-
         /* We might need to reserve an interrupt vector. */
         err = init_interrupts();
         if (err)
-                goto free_pgtables;
+                goto unmap;
 
         /* /dev/lguest needs to be registered. */
         err = lguest_device_init();
@@ -356,8 +351,6 @@ static int __init init(void)
 
 free_interrupts:
         free_interrupts();
-free_pgtables:
-        free_pagetables();
 unmap:
         unmap_switcher();
 out:
@@ -369,7 +362,6 @@ static void __exit fini(void)
 {
         lguest_device_remove();
         free_interrupts();
-        free_pagetables();
         unmap_switcher();
 
         lguest_arch_host_fini();