Attach Hyper-V guest services to VMBus 4.0

[Mike Belopuhov]

Hi,

I've got a verbal report that Hyper-V guest services aren't attached
on modern Windows 10 systems so I believe we should get this one-liner
in before 6.6.

FreeBSD revision 349856 adds another define for VMBus 5.0 but AFAICT
it doesn't attempt to use it in version negotiations.

Unfortunately, I can't test this myself at the moment.

I've got another two fixes for Hyper-V but can't test them either, so
if somebody is willing to test, please take a look at http://ix.io/1X2V


Cheers,
Mike


diff --git sys/dev/pv/hyperv.c sys/dev/pv/hyperv.c
index a75276335d6..3ab2ae22831 100644
--- sys/dev/pv/hyperv.c
+++ sys/dev/pv/hyperv.c
@@ -803,10 +803,11 @@ hv_channel_delivered(struct hv_softc *sc, struct 
vmbus_chanmsg_hdr *hdr)
 
 int
 hv_vmbus_connect(struct hv_softc *sc)
 {
        const uint32_t versions[] = {
+               VMBUS_VERSION_WIN10,
                VMBUS_VERSION_WIN8_1, VMBUS_VERSION_WIN8,
                VMBUS_VERSION_WIN7, VMBUS_VERSION_WS2008
        };
        struct vmbus_chanmsg_connect cmd;
        struct vmbus_chanmsg_connect_resp rsp;