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author | Stefan Bader <stefan.bader@canonical.com> | 2011-01-27 15:03:14 (GMT) |
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committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-01-27 15:49:34 (GMT) |
commit | cf04d120d9413de581437cf9a29f138ec1178f65 (patch) | |
tree | 29de479bca1f9b059eb219881bf0e6f6d8d13c88 /arch | |
parent | 1bae4ce27c9c90344f23c65ea6966c50ffeae2f5 (diff) | |
download | linux-cf04d120d9413de581437cf9a29f138ec1178f65.tar.xz |
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>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/x86/xen/p2m.c | 18 |
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(); |