KVM: Fix compound mmio
mmio_index should be taken into account when copying data from
userspace.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e3ac212..a9a307a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5576,7 +5576,8 @@
if (vcpu->mmio_needed) {
vcpu->mmio_needed = 0;
if (!vcpu->mmio_is_write)
- memcpy(vcpu->mmio_data, run->mmio.data, 8);
+ memcpy(vcpu->mmio_data + vcpu->mmio_index,
+ run->mmio.data, 8);
vcpu->mmio_index += 8;
if (vcpu->mmio_index < vcpu->mmio_size) {
run->exit_reason = KVM_EXIT_MMIO;