On Sun, Jan 21, 2018 at 08:54:48PM +0800, Jay Zhou wrote:
> diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
> index 765d363..c65dca2 100644
> --- a/hw/virtio/Makefile.objs
> +++ b/hw/virtio/Makefile.objs
> @@ -7,7 +7,7 @@ common-obj-y += virtio-mmio.o
>  obj-y += virtio.o virtio-balloon.o 
>  obj-$(CONFIG_LINUX) += vhost.o vhost-backend.o vhost-user.o
>  obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock.o
> -obj-y += virtio-crypto.o
> +obj-$(CONFIG_LINUX) += virtio-crypto.o
>  obj-$(CONFIG_VIRTIO_PCI) += virtio-crypto-pci.o
>  endif

This disables virtio crypto completely on non-Linux, which is not
nice. We should not break working configs.

In particular this causes test failures on non-Linux
hosts. Peter Maydell was kind enough to debug this and reported
this backtrace:

gdb --args ./aarch64-softmmu/qemu-system-aarch64 -device virtio-crypto-pci 
-machine virt
#0  0x00007f7ff450e6fa in _lwp_kill () from /usr/lib/libc.so.12
#1  0x00007f7ff450e385 in abort () from /usr/lib/libc.so.12
#2  0x00007f7ff5c65da2 in g_assertion_message () from 
#3  0x00007f7ff5c65e11 in g_assertion_message_expr () from 
#4  0x000000000074dc16 in object_initialize_with_type 
(data=data@entry=0x7f7ff33a2170, size=<optimized out>, type=0x0)
    at /root/qemu/qom/object.c:372
#5  0x000000000074de33 in object_initialize (data=data@entry=0x7f7ff33a2170, 
size=<optimized out>, typename=<optimized out>)
    at /root/qemu/qom/object.c:392
#6  0x00000000004d2293 in virtio_instance_init_common 
(proxy_obj=0x7f7ff339a000, data=0x7f7ff33a2170, vdev_size=<optimized out>, 
    vdev_name=<optimized out>) at /root/qemu/hw/virtio/virtio.c:2232
#7  0x000000000074db0d in object_initialize_with_type 
(data=data@entry=0x7f7ff339a000, size=33664, type=type@entry=0x7f7ff7b79a80)
    at /root/qemu/qom/object.c:384
#8  0x000000000074dc66 in object_new_with_type (type=0x7f7ff7b79a80) at 
#9  0x000000000074deb9 in object_new (typename=typename@entry=0x7f7ff7b454e0 
"virtio-crypto-pci") at /root/qemu/qom/object.c:502
#10 0x00000000005924d6 in qdev_device_add (opts=0x7f7ff7b4c070, 
errp=errp@entry=0x7f7fffffda10) at /root/qemu/qdev-monitor.c:615
#11 0x0000000000594d31 in device_init_func (opaque=<optimized out>, 
opts=<optimized out>, errp=<optimized out>) at /root/qemu/vl.c:2373
#12 0x0000000000826e56 in qemu_opts_foreach (list=<optimized out>, 
func=func@entry=0x594d0c <device_init_func>, opaque=opaque@entry=0x0, 
    errp=errp@entry=0x0) at /root/qemu/util/qemu-option.c:1073
#13 0x00000000008b723d in main (argc=<optimized out>, argv=<optimized out>, 
envp=<optimized out>) at /root/qemu/vl.c:4642

He explained:

<pm215> ... this is almost certainly the classic "device A depends on device B, 
device B is conditionally compiled but device A isn't"
<pm215> the type that is missing is virtio-crypto-device
<pm215> virtio-crypto.o is built only if CONFIG_LINUX, but virtio-crypto-pci is 
in virtio-crypto-pci.c which is built if CONFIG_VIRTIO_PCI


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