diff options
| author | Stefan Bader <stefan.bader@canonical.com> | 2011-01-27 10:03:14 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-24 14:54:26 -0800 |
| commit | b28e91f84d37743741afae8b2d7b75a09910e702 (patch) | |
| tree | 49dfe65f639d8ee75c82607693056811e1132db9 /arch | |
| parent | 73e33bd8bd1d5291b317a67c5a8a3fc487056dbe (diff) | |
xen/p2m: Mark INVALID_P2M_ENTRY the mfn_list past max_pfn.
commit cf04d120d9413de581437cf9a29f138ec1178f65 upstream.
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>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/xen/mmu.c | 16 |
1 files changed, 5 insertions, 11 deletions
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 468c9e2dde9b..198df8d5651f 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -399,21 +399,15 @@ 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]; } } |