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path: root/drivers/hv/hv_kvp.c
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Diffstat (limited to 'drivers/hv/hv_kvp.c')
-rw-r--r--drivers/hv/hv_kvp.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index ed50e9e83c61..28b03325b872 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -29,6 +29,16 @@
#include <linux/hyperv.h>
+/*
+ * Pre win8 version numbers used in ws2008 and ws 2008 r2 (win7)
+ */
+#define WIN7_SRV_MAJOR 3
+#define WIN7_SRV_MINOR 0
+#define WIN7_SRV_MAJOR_MINOR (WIN7_SRV_MAJOR << 16 | WIN7_SRV_MINOR)
+
+#define WIN8_SRV_MAJOR 4
+#define WIN8_SRV_MINOR 0
+#define WIN8_SRV_MAJOR_MINOR (WIN8_SRV_MAJOR << 16 | WIN8_SRV_MINOR)
/*
* Global state maintained for transaction that is being processed.
@@ -76,7 +86,9 @@ static u8 *recv_buffer;
/*
* Register the kernel component with the user-level daemon.
* As part of this registration, pass the LIC version number.
+ * This number has no meaning, it satisfies the registration protocol.
*/
+#define HV_DRV_VERSION "3.1"
static void
kvp_register(int reg_value)
@@ -593,8 +605,19 @@ void hv_kvp_onchannelcallback(void *context)
sizeof(struct vmbuspipe_hdr)];
if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
+ /*
+ * We start with win8 version and if the host cannot
+ * support that we use the previous version.
+ */
+ if (vmbus_prep_negotiate_resp(icmsghdrp, negop,
+ recv_buffer, UTIL_FW_MAJOR_MINOR,
+ WIN8_SRV_MAJOR_MINOR))
+ goto done;
+
vmbus_prep_negotiate_resp(icmsghdrp, negop,
- recv_buffer, MAX_SRV_VER, MAX_SRV_VER);
+ recv_buffer, UTIL_FW_MAJOR_MINOR,
+ WIN7_SRV_MAJOR_MINOR);
+
} else {
kvp_msg = (struct hv_kvp_msg *)&recv_buffer[
sizeof(struct vmbuspipe_hdr) +
@@ -626,6 +649,7 @@ void hv_kvp_onchannelcallback(void *context)
return;
}
+done:
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
| ICMSGHDRFLAG_RESPONSE;