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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>
This commit is contained in:
Olaf Hering 2015-12-14 16:01:42 -08:00 committed by Greg Kroah-Hartman
parent 3053c76244
commit ed9ba608e4
1 changed files with 5 additions and 0 deletions
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5
drivers/hv/hv_snapshot.c
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@ -331,6 +331,11 @@ static void vss_on_reset(void)
int int
hv_vss_init(struct hv_util_service *srv) 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; recv_buffer = srv->recv_buffer;
/* /*