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authorRusty Russell <rusty@rustcorp.com.au>2009-09-23 22:26:46 -0600
committerRusty Russell <rusty@rustcorp.com.au>2009-09-23 22:26:46 +0930
commitfb100d78c04ff6053047625d0368d0d4b1d9912a (patch)
treebd07302aed54c75cc5c64af2503b29a21014103c /drivers/lguest
parent4c1ea3dd718a1d93a726cb3e66665ac4170dcccd (diff)
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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>
Diffstat (limited to 'drivers/lguest')
-rw-r--r--drivers/lguest/page_tables.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c
index 232fba6a488..bf37a31c0e0 100644
--- a/drivers/lguest/page_tables.c
+++ b/drivers/lguest/page_tables.c
@@ -996,11 +996,9 @@ static unsigned long setup_pagetables(struct lguest *lg,
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
/*