KVM: Fix apic_mmio_write return for unaligned write

Some in-famous OS do unaligned writing for APIC MMIO, and the return value
has been missed in recent change, then the OS hangs.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 683345a121b7..6c8460308548 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -834,7 +834,7 @@ static int apic_mmio_write(struct kvm_io_device *this,
         if (len != 4 || (offset & 0xf)) {
                 /* Don't shout loud, $infamous_os would cause only noise. */
                 apic_debug("apic write: bad size=%d %lx\n", len, (long)address);
-                return;
+                return 0;
         }
 
         val = *(u32*)data;