aboutsummaryrefslogtreecommitdiff
path: root/virt
diff options
context:
space:
mode:
authorTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>2012-05-20 13:13:28 +0900
committerAvi Kivity <avi@redhat.com>2012-06-05 16:29:39 +0300
commit92eca8faad2d1b136c939bc122842dcdabd6ff46 (patch)
treee7ee10a4a8eadea746fc8b9fdc53253cb1cdc42d /virt
parent99becf1328d8d71dd6f4480e3591d7dcdb389e57 (diff)
downloadlinux-92eca8faad2d1b136c939bc122842dcdabd6ff46.tar.gz
KVM: Separate out dirty_bitmap allocation code as kvm_kvzalloc()
Will be used for lpage_info allocation later. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
-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 7e140683ff1..1148c96a481 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;