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| author | Zachary Amsden <zach@vmware.com> | 2007-08-21 18:30:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-08-22 11:10:47 -0700 |
| commit | 8b14cb9953c6b569327e9372718cff09a98f9589 (patch) | |
| tree | b4eeaa2cb428fc6471c0f124cb8bb9e23de03273 | |
| parent | cb00e99c0abd844b884c64c6b54aa3b7d345ebb1 (diff) | |
| download | op-kernel-dev-8b14cb9953c6b569327e9372718cff09a98f9589.zip op-kernel-dev-8b14cb9953c6b569327e9372718cff09a98f9589.tar.gz | |
Fix lazy mode vmalloc synchronization for paravirt
Touching vmalloc memory in the middle of a lazy mode update can generate
a kernel PDE update, which must be flushed immediately. The fix is to
leave lazy mode when doing a vmalloc sync.
Signed-off-by: Zachary Amsden <zach@vmware.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/i386/mm/fault.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c index 01ffdd4..fcb38e7 100644 --- a/arch/i386/mm/fault.c +++ b/arch/i386/mm/fault.c @@ -249,9 +249,10 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address) pmd_k = pmd_offset(pud_k, address); if (!pmd_present(*pmd_k)) return NULL; - if (!pmd_present(*pmd)) + if (!pmd_present(*pmd)) { set_pmd(pmd, *pmd_k); - else + arch_flush_lazy_mmu_mode(); + } else BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k)); return pmd_k; } |
