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Diffstat (limited to 'virt/kvm/kvm_main.c')
-rw-r--r--virt/kvm/kvm_main.c32
1 files changed, 22 insertions, 10 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 7e140683ff14..1148c96a4817 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -516,16 +516,32 @@ out_err_nodisable:
return ERR_PTR(r);
}
+/*
+ * Avoid using vmalloc for a small buffer.
+ * Should not be used when the size is statically known.
+ */
+static void *kvm_kvzalloc(unsigned long size)
+{
+ if (size > PAGE_SIZE)
+ return vzalloc(size);
+ else
+ return kzalloc(size, GFP_KERNEL);
+}
+
+static void kvm_kvfree(const void *addr)
+{
+ if (is_vmalloc_addr(addr))
+ vfree(addr);
+ else
+ kfree(addr);
+}
+
static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
{
if (!memslot->dirty_bitmap)
return;
- if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
- vfree(memslot->dirty_bitmap);
- else
- kfree(memslot->dirty_bitmap);
-
+ kvm_kvfree(memslot->dirty_bitmap);
memslot->dirty_bitmap = NULL;
}
@@ -617,11 +633,7 @@ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
#ifndef CONFIG_S390
unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
- if (dirty_bytes > PAGE_SIZE)
- memslot->dirty_bitmap = vzalloc(dirty_bytes);
- else
- memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
-
+ memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
if (!memslot->dirty_bitmap)
return -ENOMEM;