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authorTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>2010-04-12 19:35:35 +0900
committerAvi Kivity <avi@redhat.com>2010-04-20 13:06:55 +0300
commit87bf6e7de1134f48681fd2ce4b7c1ec45458cb6d (patch)
treeae8ce63cecab98c036c0d76422de42cf78e042f4 /include
parent77662e0028c7c63e34257fda03ff9625c59d939d (diff)
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KVM: fix the handling of dirty bitmaps to avoid overflows
Int is not long enough to store the size of a dirty bitmap. This patch fixes this problem with the introduction of a wrapper function to calculate the sizes of dirty bitmaps. Note: in mark_page_dirty(), we have to consider the fact that __set_bit() takes the offset as int, not long. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kvm_host.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a3fd0f91d94..9ad825e1c79 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -119,6 +119,11 @@ struct kvm_memory_slot {
int user_alloc;
};
+static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
+{
+ return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
+}
+
struct kvm_kernel_irq_routing_entry {
u32 gsi;
u32 type;