lguest: use PGDIR_SHIFT for PAE code to allow different PAGE_OFFSET
We still assume the Guest and Host have the same PAGE_OFFSET settings,
but now we don't assume 0xC0000000.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Matias Zabaljauregui <zabaljauregui@gmail.com>
diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c
index 232fba6..bf37a31 100644
--- a/drivers/lguest/page_tables.c
+++ b/drivers/lguest/page_tables.c
@@ -996,11 +996,9 @@
if (copy_to_user(&pgdir[0], &pgd, sizeof(pgd)) != 0)
return -EFAULT;
/*
- * And the third PGD entry (ie. addresses 3G-4G).
- *
- * FIXME: This assumes that PAGE_OFFSET for the Guest is 0xC0000000.
+ * And the other PGD entry to make the linear mapping at PAGE_OFFSET
*/
- if (copy_to_user(&pgdir[3], &pgd, sizeof(pgd)) != 0)
+ if (copy_to_user(&pgdir[KERNEL_PGD_BOUNDARY], &pgd, sizeof(pgd)))
return -EFAULT;
#else
/*