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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-08-16 11:31:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-08-16 11:31:59 -0700 |
| commit | ad54e461137765aaf090eb7f54c3b51fc0ad5d62 (patch) | |
| tree | fb257781ffc6bdb5267f8754cb4c7cd9d41f7070 | |
| parent | 15a063f78eba39e1b040b2c4cab422980b58219a (diff) | |
| parent | 5bc6f9888db5739abfa0cae279b4b442e4db8049 (diff) | |
Merge tag 'stable/for-linus-3.6-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
Pull Xen fix from Konrad Rzeszutek Wilk:
"Way back in v3.5 we added a mechanism to populate back pages that were
released (they overlapped with MMIO regions), but neglected to reserve
the proper amount of virtual space for extend_brk to work properly.
Coincidentally some other commit aligned the _brk space to larger area
so I didn't trigger this until it was run on a machine with more than
2GB of MMIO space."
* On machines with large MMIO/PCI E820 spaces we fail to boot b/c
we failed to pre-allocate large enough virtual space for extend_brk.
* tag 'stable/for-linus-3.6-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/p2m: Reserve 8MB of _brk space for P2M leafs when populating back.
| -rw-r--r-- | arch/x86/xen/p2m.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 64effdc6da9..b2e91d40a4c 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -194,6 +194,11 @@ RESERVE_BRK(p2m_mid_mfn, PAGE_SIZE * (MAX_DOMAIN_PAGES / (P2M_PER_PAGE * P2M_MID * boundary violation will require three middle nodes. */ RESERVE_BRK(p2m_mid_identity, PAGE_SIZE * 2 * 3); +/* When we populate back during bootup, the amount of pages can vary. The + * max we have is seen is 395979, but that does not mean it can't be more. + * But some machines can have 3GB I/O holes even. So lets reserve enough + * for 4GB of I/O and E820 holes. */ +RESERVE_BRK(p2m_populated, PMD_SIZE * 4); static inline unsigned p2m_top_index(unsigned long pfn) { BUG_ON(pfn >= MAX_P2M_PFN); |