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authorStefan Bader <stefan.bader@canonical.com>2011-01-27 10:03:14 -0500
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-01-27 10:49:34 -0500
commitcf04d120d9413de581437cf9a29f138ec1178f65 (patch)
tree29de479bca1f9b059eb219881bf0e6f6d8d13c88
parent1bae4ce27c9c90344f23c65ea6966c50ffeae2f5 (diff)
downloadop-kernel-dev-cf04d120d9413de581437cf9a29f138ec1178f65.zip
op-kernel-dev-cf04d120d9413de581437cf9a29f138ec1178f65.tar.gz
xen/p2m: Mark INVALID_P2M_ENTRY the mfn_list past max_pfn.
In case the mfn_list does not have enough entries to fill a p2m page we do not want the entries from max_pfn up to the boundary to be filled with unknown values. Hence set them to INVALID_P2M_ENTRY. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
-rw-r--r--arch/x86/xen/p2m.c18
1 files changed, 6 insertions, 12 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index ddc81a0..fd12d7c 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -241,21 +241,15 @@ void __init xen_build_dynamic_phys_to_machine(void)
* As long as the mfn_list has enough entries to completely
* fill a p2m page, pointing into the array is ok. But if
* not the entries beyond the last pfn will be undefined.
- * And guessing that the 'what-ever-there-is' does not take it
- * too kindly when changing it to invalid markers, a new page
- * is allocated, initialized and filled with the valid part.
*/
if (unlikely(pfn + P2M_PER_PAGE > max_pfn)) {
unsigned long p2midx;
- unsigned long *p2m = extend_brk(PAGE_SIZE, PAGE_SIZE);
- p2m_init(p2m);
-
- for (p2midx = 0; pfn + p2midx < max_pfn; p2midx++) {
- p2m[p2midx] = mfn_list[pfn + p2midx];
- }
- p2m_top[topidx][mididx] = p2m;
- } else
- p2m_top[topidx][mididx] = &mfn_list[pfn];
+
+ p2midx = max_pfn % P2M_PER_PAGE;
+ for ( ; p2midx < P2M_PER_PAGE; p2midx++)
+ mfn_list[pfn + p2midx] = INVALID_P2M_ENTRY;
+ }
+ p2m_top[topidx][mididx] = &mfn_list[pfn];
}
m2p_override_init();
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