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| author | Olaf Hering <olaf@aepfle.de> | 2015-12-15 03:01:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-12-15 06:15:05 +0300 |
| commit | ed9ba608e4851144af8c7061cbb19f751c73e998 (patch) | |
| tree | 293b915125a0ee9731dfc896ff394fd291a33c8a | |
| parent | 3053c762444a83ec6a8777f9476668b23b8ab180 (diff) | |
| download | linux-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>
| -rw-r--r-- | drivers/hv/hv_snapshot.c | 5 |
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; /* |