Olaf Hering <olaf@xxxxxxxxx> writes:
> 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@xxxxxxxxx>
> ---
> drivers/hv/hv_snapshot.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
> index a548ae4..52f10ed 100644
> --- a/drivers/hv/hv_snapshot.c
> +++ b/drivers/hv/hv_snapshot.c
> @@ -331,6 +331,16 @@ static void vss_on_reset(void)
> int
> hv_vss_init(struct hv_util_service *srv)
> {
> + switch (vmbus_proto_version) {
> + case VERSION_WS2008:
> + case VERSION_WIN7:
> + case VERSION_WIN8:
Wouldn't it be better to simplify it to
if (vmbus_proto_version < VERSION_WIN8_1) {
pr_warn();
return ...
}
E.g. there was a patch for storvsc some time ago:
commit 6ee5c61535a2df807069145970d3e7fa492a3fac
Author: Keith Mange <keith.mange@xxxxxxxxxxxxx>
Date: Thu Aug 13 08:43:46 2015 -0700
storvsc: Rather than look for sets of specific protocol versions,
make decisions based on ranges.
> + pr_warn("Integration service 'Backup (volume snapshot)'"
> + " not supported on this host version.\n");
> + return -ENOTSUPP;
> + default:
> + break;
> + }
> recv_buffer = srv->recv_buffer;
>
> /*
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--
Vitaly
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