The patch titled
xen: mask _PAGE_PCD from ptes
has been added to the -mm tree. Its filename is
xen-mask-_page_pcd-from-ptes.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: xen: mask _PAGE_PCD from ptes
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
_PAGE_PCD maps a page with caching disabled, which is typically used for
mapping harware registers. Xen never allows it to be set on a mapping, and
unprivileged guests never need it since they can't see the real underlying
hardware. However, some uncached mappings are made early when probing the
(non-existent) APIC, and its OK to mask off the PCD flag in these cases.
This became necessary because Xen started checking for this bit, rather
than silently masking it off.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/xen/mmu.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN arch/x86/xen/mmu.c~xen-mask-_page_pcd-from-ptes arch/x86/xen/mmu.c
--- a/arch/x86/xen/mmu.c~xen-mask-_page_pcd-from-ptes
+++ a/arch/x86/xen/mmu.c
@@ -244,6 +244,8 @@ pte_t xen_make_pte(unsigned long long pt
if (pte & 1)
pte = phys_to_machine(XPADDR(pte)).maddr;
+ pte &= ~_PAGE_PCD;
+
return (pte_t){ pte, pte >> 32 };
}
@@ -291,6 +293,8 @@ pte_t xen_make_pte(unsigned long pte)
if (pte & _PAGE_PRESENT)
pte = phys_to_machine(XPADDR(pte)).maddr;
+ pte &= ~_PAGE_PCD;
+
return (pte_t){ pte };
}
_
Patches currently in -mm which might be from jeremy@xxxxxxxx are
origin.patch
xen-mask-_page_pcd-from-ptes.patch
maps4-simplify-interdependence-of-maps-and-smaps.patch
maps4-move-clear_refs-code-to-task_mmuc.patch
maps4-regroup-task_mmu-by-interface.patch
maps4-add-proc-kpagecount-interface.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
