x86/early_ioremap: don't assume we're using swapper_pg_dir

At the early stages of boot, before the kernel pagetable has been
fully initialized, a Xen kernel will still be running off the
Xen-provided pagetables rather than swapper_pg_dir[].  Therefore,
readback cr3 to determine the base of the pagetable rather than
assuming swapper_pg_dir[].

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Tested-by: Jody Belka <knew-linux@pimb.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index a4897a85268a..9f42d7e9c158 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -265,7 +265,9 @@ static __initdata pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
 
 static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
 {
-        pgd_t *pgd = &swapper_pg_dir[pgd_index(addr)];
+        /* Don't assume we're using swapper_pg_dir at this point */
+        pgd_t *base = __va(read_cr3());
+        pgd_t *pgd = &base[pgd_index(addr)];
         pud_t *pud = pud_offset(pgd, addr);
         pmd_t *pmd = pmd_offset(pud, addr);