From 8b14cb9953c6b569327e9372718cff09a98f9589 Mon Sep 17 00:00:00 2001
From: Zachary Amsden <zach@vmware.com>
Date: Tue, 21 Aug 2007 18:30:36 -0700
Subject: [PATCH] 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>
---
arch/i386/mm/fault.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index 01ffdd4964f08..fcb38e7f35434 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;
}
--
2.30.2