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| author | Andres Lagar-Cavilla <andres@lagarcavilla.org> | 2012-01-26 12:46:26 +0000 |
|---|---|---|
| committer | Andres Lagar-Cavilla <andres@lagarcavilla.org> | 2012-01-26 12:46:26 +0000 |
| commit | 8ed0c272481880b75442e62aad75c30ecfa798ce (patch) | |
| tree | eca536fc2cf4240c4bfdf7250ea24e545ab22eb6 /xen/include/asm-x86/mm.h | |
| parent | 6a11f31bd53381b925e67413e8230af8979e3807 (diff) | |
| download | xen-8ed0c272481880b75442e62aad75c30ecfa798ce.tar.gz xen-8ed0c272481880b75442e62aad75c30ecfa798ce.tar.bz2 xen-8ed0c272481880b75442e62aad75c30ecfa798ce.zip | |
x86/mm: Enforce lock ordering for sharing page locks
Use the ordering constructs in mm-locks.h to enforce an order
for the p2m and page locks in the sharing code. Applies to either
the global sharing lock (in audit mode) or the per page locks.
Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Signed-off-by: Adin Scanneell <adin@scannell.ca>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Tim Deegan <tim@xen.org>
Diffstat (limited to 'xen/include/asm-x86/mm.h')
| -rw-r--r-- | xen/include/asm-x86/mm.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h index c8d5d66e4f..3c2090f035 100644 --- a/xen/include/asm-x86/mm.h +++ b/xen/include/asm-x86/mm.h @@ -351,7 +351,8 @@ void clear_superpage_mark(struct page_info *page); * backing. Nesting may happen when sharing (and locking) two pages -- deadlock * is avoided by locking pages in increasing order. * Memory sharing may take the p2m_lock within a page_lock/unlock - * critical section. + * critical section. We enforce ordering between page_lock and p2m_lock using an + * mm-locks.h construct. * * These two users (pte serialization and memory sharing) do not collide, since * sharing is only supported for hvm guests, which do not perform pv pte updates. |