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 8f2251d2a3f8..fd12d7ce7ff9 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) p2m_top[topidx] = mid; } + /* + * 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. + */ + if (unlikely(pfn + P2M_PER_PAGE > max_pfn)) { + unsigned long p2midx; + + 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]; } |