Drivers: hv: balloon: Enable dynamic memory protocol negotiation with Windows 10...

Support Win10 protocol for Dynamic Memory. Thia patch allows guests on Win10 hosts
to hot-add memory even when dynamic memory is not enabled on the guest.

Signed-off-by: Alex Ng <alexng@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_balloon.c b/drivers/hv/hv_balloon.c
index 8a725cd69ad73601dbbe3153a1ef77e851484798..b853b4b083bde2c402ee4dbacdd25736b4273e58 100644 (file)
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -62,11 +62,13 @@
 enum {
        DYNMEM_PROTOCOL_VERSION_1 = DYNMEM_MAKE_VERSION(0, 3),
        DYNMEM_PROTOCOL_VERSION_2 = DYNMEM_MAKE_VERSION(1, 0),
+       DYNMEM_PROTOCOL_VERSION_3 = DYNMEM_MAKE_VERSION(2, 0),
 
        DYNMEM_PROTOCOL_VERSION_WIN7 = DYNMEM_PROTOCOL_VERSION_1,
        DYNMEM_PROTOCOL_VERSION_WIN8 = DYNMEM_PROTOCOL_VERSION_2,
+       DYNMEM_PROTOCOL_VERSION_WIN10 = DYNMEM_PROTOCOL_VERSION_3,
 
-       DYNMEM_PROTOCOL_VERSION_CURRENT = DYNMEM_PROTOCOL_VERSION_WIN8
+       DYNMEM_PROTOCOL_VERSION_CURRENT = DYNMEM_PROTOCOL_VERSION_WIN10
 };
 
 
@@ -1296,13 +1298,25 @@ static void version_resp(struct hv_dynmem_device *dm,
        if (dm->next_version == 0)
                goto version_error;
 
-       dm->next_version = 0;
        memset(&version_req, 0, sizeof(struct dm_version_request));
        version_req.hdr.type = DM_VERSION_REQUEST;
        version_req.hdr.size = sizeof(struct dm_version_request);
        version_req.hdr.trans_id = atomic_inc_return(&trans_id);
-       version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN7;
-       version_req.is_last_attempt = 1;
+       version_req.version.version = dm->next_version;
+
+       /*
+        * Set the next version to try in case current version fails.
+        * Win7 protocol ought to be the last one to try.
+        */
+       switch (version_req.version.version) {
+       case DYNMEM_PROTOCOL_VERSION_WIN8:
+               dm->next_version = DYNMEM_PROTOCOL_VERSION_WIN7;
+               version_req.is_last_attempt = 0;
+               break;
+       default:
+               dm->next_version = 0;
+               version_req.is_last_attempt = 1;
+       }
 
        ret = vmbus_sendpacket(dm->dev->channel, &version_req,
                                sizeof(struct dm_version_request),
@@ -1442,7 +1456,7 @@ static int balloon_probe(struct hv_device *dev,
 
        dm_device.dev = dev;
        dm_device.state = DM_INITIALIZING;
-       dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN7;
+       dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN8;
        init_completion(&dm_device.host_event);
        init_completion(&dm_device.config_event);
        INIT_LIST_HEAD(&dm_device.ha_region_list);
@@ -1474,7 +1488,7 @@ static int balloon_probe(struct hv_device *dev,
        version_req.hdr.type = DM_VERSION_REQUEST;
        version_req.hdr.size = sizeof(struct dm_version_request);
        version_req.hdr.trans_id = atomic_inc_return(&trans_id);
-       version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN8;
+       version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN10;
        version_req.is_last_attempt = 0;
 
        ret = vmbus_sendpacket(dev->channel, &version_req,