Commit ed9ba608 authored Dec 14, 2015 by Olaf Hering Committed by Greg Kroah-Hartman Dec 14, 2015

Drivers: hv: vss: run only on supported host versions



The Backup integration service on WS2012 has appearently trouble to
negotiate with a guest which does not support the provided util version.
Currently the VSS driver supports only version 5/0. A WS2012 offers only
version 1/x and 3/x, and vmbus_prep_negotiate_resp correctly returns an
empty icframe_vercnt/icmsg_vercnt. But the host ignores that and
continues to send ICMSGTYPE_NEGOTIATE messages. The result are weird
errors during boot and general misbehaviour.

Check the Windows version to work around the host bug, skip hv_vss_init
on WS2012 and older.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 3053c762

drivers/hv/hv_snapshot.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -331,6 +331,11 @@ static void vss_on_reset(void)
		int
		hv_vss_init(struct hv_util_service *srv)
		{
		if (vmbus_proto_version < VERSION_WIN8_1) {
		pr_warn("Integration service 'Backup (volume snapshot)'"
		" not supported on this host version.\n");
		return -ENOTSUPP;
		}
		recv_buffer = srv->recv_buffer;

		/*

Admin message