diff options
Diffstat (limited to 'arch/x86/xen/p2m.c')
-rw-r--r-- | arch/x86/xen/p2m.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 8f2251d2a3f..fd12d7ce7ff 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c | |||
@@ -237,6 +237,18 @@ void __init xen_build_dynamic_phys_to_machine(void) | |||
237 | p2m_top[topidx] = mid; | 237 | p2m_top[topidx] = mid; |
238 | } | 238 | } |
239 | 239 | ||
240 | /* | ||
241 | * As long as the mfn_list has enough entries to completely | ||
242 | * fill a p2m page, pointing into the array is ok. But if | ||
243 | * not the entries beyond the last pfn will be undefined. | ||
244 | */ | ||
245 | if (unlikely(pfn + P2M_PER_PAGE > max_pfn)) { | ||
246 | unsigned long p2midx; | ||
247 | |||
248 | p2midx = max_pfn % P2M_PER_PAGE; | ||
249 | for ( ; p2midx < P2M_PER_PAGE; p2midx++) | ||
250 | mfn_list[pfn + p2midx] = INVALID_P2M_ENTRY; | ||
251 | } | ||
240 | p2m_top[topidx][mididx] = &mfn_list[pfn]; | 252 | p2m_top[topidx][mididx] = &mfn_list[pfn]; |
241 | } | 253 | } |
242 | 254 | ||