Drivers: hv: vmbus: Use all supported IC versions to negotiate
Previously, we were assuming that each IC protocol version was tied to a
specific host version. For example, some Windows 10 preview hosts only
support v3 TimeSync even though driver assumes v4 is supported by all
Windows 10 hosts.
The guest will stop trying to negotiate even though older supported
versions may still be offered by the host.
Make IC version negotiation more robust by going through all versions
that are supported by the guest.
Fixes: 3da0401b4d0e ("Drivers: hv: utils: Fix the mapping between host
version and protocol to use")
Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
Signed-off-by: Alex Ng <alexng@messages.microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/hv/hv_fcopy.c b/drivers/hv/hv_fcopy.c
index e47d8c9..0a315e6 100644
--- a/drivers/hv/hv_fcopy.c
+++ b/drivers/hv/hv_fcopy.c
@@ -31,6 +31,16 @@
#define WIN8_SRV_MINOR 1
#define WIN8_SRV_VERSION (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
+#define FCOPY_VER_COUNT 1
+static const int fcopy_versions[] = {
+ WIN8_SRV_VERSION
+};
+
+#define FW_VER_COUNT 1
+static const int fw_versions[] = {
+ UTIL_FW_VERSION
+};
+
/*
* Global state maintained for transaction that is being processed.
* For a class of integration services, including the "file copy service",
@@ -228,8 +238,6 @@
u64 requestid;
struct hv_fcopy_hdr *fcopy_msg;
struct icmsg_hdr *icmsghdr;
- struct icmsg_negotiate *negop = NULL;
- int util_fw_version;
int fcopy_srv_version;
if (fcopy_transaction.state > HVUTIL_READY)
@@ -243,10 +251,10 @@
icmsghdr = (struct icmsg_hdr *)&recv_buffer[
sizeof(struct vmbuspipe_hdr)];
if (icmsghdr->icmsgtype == ICMSGTYPE_NEGOTIATE) {
- util_fw_version = UTIL_FW_VERSION;
- fcopy_srv_version = WIN8_SRV_VERSION;
- vmbus_prep_negotiate_resp(icmsghdr, negop, recv_buffer,
- util_fw_version, fcopy_srv_version);
+ vmbus_prep_negotiate_resp(icmsghdr, recv_buffer,
+ fw_versions, FW_VER_COUNT,
+ fcopy_versions, FCOPY_VER_COUNT,
+ NULL, &fcopy_srv_version);
} else {
fcopy_msg = (struct hv_fcopy_hdr *)&recv_buffer[
sizeof(struct vmbuspipe_hdr) +