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Drivers: hv: vmbus: enable VMBus protocol version 5.0

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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>
This commit is contained in:
Dexuan Cui 2018-05-12 02:30:33 -07:00 • committed by Greg Kroah-Hartman
parent e19f70aa02
commit ae20b25430
3 changed files with 69 additions and 4 deletions
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26
include/linux/hyperv.h
View file

@ -163,6 +163,7 @@ static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi)
* 2 . 4 (Windows 8)
* 3 . 0 (Windows 8 R2)
* 4 . 0 (Windows 10)
* 5 . 0 (Newer Windows 10)
*/
#define VERSION_WS2008 ((0 << 16) | (13))
@ -170,10 +171,11 @@ static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi)
#define VERSION_WIN8 ((2 << 16) | (4))
#define VERSION_WIN8_1 ((3 << 16) | (0))
#define VERSION_WIN10 ((4 << 16) | (0))
#define VERSION_WIN10_V5 ((5 << 16) | (0))
#define VERSION_INVAL -1
#define VERSION_CURRENT VERSION_WIN10
#define VERSION_CURRENT VERSION_WIN10_V5
/* Make maximum size of pipe payload of 16K */
#define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384)
@ -570,7 +572,14 @@ struct vmbus_channel_initiate_contact {
struct vmbus_channel_message_header header;
u32 vmbus_version_requested;
u32 target_vcpu; /* The VCPU the host should respond to */
u64 interrupt_page;
union {
u64 interrupt_page;
struct {
u8 msg_sint;
u8 padding1[3];
u32 padding2;
};
};
u64 monitor_page1;
u64 monitor_page2;
} __packed;
@ -585,6 +594,19 @@ struct vmbus_channel_tl_connect_request {
struct vmbus_channel_version_response {
struct vmbus_channel_message_header header;
u8 version_supported;
u8 connection_state;
u16 padding;
/*
* On new hosts that support VMBus protocol 5.0, we must use
* VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message,
* and for subsequent messages, we must use the Message Connection ID
* field in the host-returned Version Response Message.
*
* On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1).
*/
u32 msg_conn_id;
} __packed;
enum vmbus_channel_state {