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authorAlex Ng <alexng@microsoft.com>2015-08-02 02:08:13 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-08-05 08:28:39 +0300
commitb6ddeae1603dfa55e857ba1520f5acea83f8cf1c (patch)
tree2848413f8d8246881a6b77560abbe572165af503 /drivers/hv/hv_balloon.c
parent25ef06fe27a292ad33155045ef7a123be4c0b6ab (diff)
downloadlinux-b6ddeae1603dfa55e857ba1520f5acea83f8cf1c.tar.xz
Drivers: hv: balloon: Enable dynamic memory protocol negotiation with Windows 10 hosts
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>
Diffstat (limited to 'drivers/hv/hv_balloon.c')
-rw-r--r--drivers/hv/hv_balloon.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index 8a725cd69ad7..b853b4b083bd 100644
--- 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,