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authorOlaf Hering <olaf@aepfle.de>2015-12-15 03:01:42 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-12-15 06:15:05 +0300
commited9ba608e4851144af8c7061cbb19f751c73e998 (patch)
tree293b915125a0ee9731dfc896ff394fd291a33c8a /drivers/hv/hv_snapshot.c
parent3053c762444a83ec6a8777f9476668b23b8ab180 (diff)
downloadlinux-ed9ba608e4851144af8c7061cbb19f751c73e998.tar.xz
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>
Diffstat (limited to 'drivers/hv/hv_snapshot.c')
-rw-r--r--drivers/hv/hv_snapshot.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index a548ae42c927..81882d4848bd 100644
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -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;
/*