From: Jeremy Fitzhardinge <jeremy@xensource.com>
Date: Wed, 13 Feb 2008 15:20:35 +0000 (+0100)
Subject: xen: unpin initial Xen pagetable once we're finished with it
X-Git-Tag: v2.6.25-rc2~74^2~4
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2b5407811db755257ae53c75cc6b312ed5d2ad9e;p=linux-2.6

xen: unpin initial Xen pagetable once we're finished with it

Unpin the Xen-provided pagetable once we've finished with it, so it
doesn't cause stray references which cause later swapper_pg_dir
pagetable updates to fail.

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

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index de647bc6e7..49e5358f48 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -798,6 +798,10 @@ static __init void xen_pagetable_setup_start(pgd_t *base)
 	 * added to the table can be prepared properly for Xen.
 	 */
 	xen_write_cr3(__pa(base));
+
+	/* Unpin initial Xen pagetable */
+	pin_pagetable_pfn(MMUEXT_UNPIN_TABLE,
+			  PFN_DOWN(__pa(xen_start_info->pt_base)));
 }
 
 static __init void xen_pagetable_setup_done(pgd_t *base)