diff options
| author | Alex Ng <alexng@microsoft.com> | 2015-08-01 16:08:13 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-04 22:28:39 -0700 |
| commit | b6ddeae1603dfa55e857ba1520f5acea83f8cf1c (patch) | |
| tree | 2848413f8d8246881a6b77560abbe572165af503 /drivers/hv | |
| parent | 25ef06fe27a292ad33155045ef7a123be4c0b6ab (diff) | |
| download | linux-b6ddeae1603dfa55e857ba1520f5acea83f8cf1c.tar.bz2 | |
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')
| -rw-r--r-- | drivers/hv/hv_balloon.c | 26 |
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, |