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| author |   Dexuan Cui <decui@microsoft.com> | 2018-05-12 02:30:33 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-14 16:06:48 +0200 |
| commit | ae20b254306a6a47054ea0eb8444e0bd8e71fe12 (patch) | |
| tree | 7332e19407319ad6b197a9474f5635010e695b4b /drivers/hv/hyperv_vmbus.h | |
| parent | android: binder: Change return type to vm_fault_t (diff) | |
| download | linux-dev-ae20b254306a6a47054ea0eb8444e0bd8e71fe12.tar.xz linux-dev-ae20b254306a6a47054ea0eb8444e0bd8e71fe12.zip | |
Drivers: hv: vmbus: enable VMBus protocol version 5.0
With VMBus protocol 5.0, we're able to better support new features, e.g.
running two or more VMBus drivers simultaneously in a single VM -- note:
we can't simply load the current VMBus driver twice, instead, a secondary
VMBus driver must be implemented.
This patch adds the support for the new VMBus protocol, which is available
on new Windows hosts, by:
1) We still use SINT2 for compatibility;
2) We must use Connection ID 4 for the Initiate Contact Message, and for
subsequent messages, we must use the Message Connection ID field in
the host-returned VersionResponse Message.
Notes for developers of the secondary VMBus driver:
1) Must use VMBus protocol 5.0 as well;
2) Must use a different SINT number that is not in use.
3) Must use Connection ID 4 for the Initiate Contact Message, and for
subsequent messages, must use the Message Connection ID field in
the host-returned VersionResponse Message.
4) It's possible that the primary VMBus driver using protocol version 4.0
can work with a secondary VMBus driver using protocol version 5.0, but it's
recommended that both should use 5.0 for new Hyper-V features in the future.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Michael Kelley <mikelley@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/hyperv_vmbus.h')
| -rw-r--r-- | drivers/hv/hyperv_vmbus.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index f761bef36e77..72eaba3d50fc 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -187,6 +187,7 @@ struct hv_input_post_message { enum { VMBUS_MESSAGE_CONNECTION_ID = 1, + VMBUS_MESSAGE_CONNECTION_ID_4 = 4, VMBUS_MESSAGE_PORT_ID = 1, VMBUS_EVENT_CONNECTION_ID = 2, VMBUS_EVENT_PORT_ID = 2, @@ -302,6 +303,8 @@ struct vmbus_connection { */ int connect_cpu; + u32 msg_conn_id; + atomic_t offer_in_progress; enum vmbus_connect_state conn_state; |