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Commit abbf3b2a authored by K. Y. Srinivasan's avatar K. Y. Srinivasan Committed by Greg Kroah-Hartman
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Drivers: hv: Add state to manage incoming channel interrupt load 



Add state to bind a channel to a specific VCPU. This will help us better
distribute incoming interrupt load.

Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 917ea427

drivers/hv/channel.c

+1 −1
Original line number Diff line number Diff line
@@ -181,7 +181,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 
	open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle;

	open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >>

						  PAGE_SHIFT;

	open_msg->server_contextarea_gpadlhandle = 0;

	open_msg->target_vp = newchannel->target_vp;



	if (userdatalen > MAX_USER_DEFINED_BYTES) {

		err = -EINVAL;

drivers/hv/channel_mgmt.c

+2 −0
Original line number Diff line number Diff line
@@ -302,6 +302,8 @@ static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) 
				offer->connection_id;

	}



	newchannel->target_vp = 0;



	memcpy(&newchannel->offermsg, offer,

	       sizeof(struct vmbus_channel_offer_channel));

	newchannel->monitor_grp = (u8)offer->monitorid / 32;

include/linux/hyperv.h

+19 −2
Original line number Diff line number Diff line
@@ -732,8 +732,15 @@ struct vmbus_channel_open_channel { 
	/* GPADL for the channel's ring buffer. */

	u32 ringbuffer_gpadlhandle;



	/* GPADL for the channel's server context save area. */

	u32 server_contextarea_gpadlhandle;

	/*

	 * Starting with win8, this field will be used to specify

	 * the target virtual processor on which to deliver the interrupt for

	 * the host to guest communication.

	 * Prior to win8, incoming channel interrupts would only

	 * be delivered on cpu 0. Setting this value to 0 would

	 * preserve the earlier behavior.

	 */

	u32 target_vp;



	/*

	* The upstream ring buffer begins at offset zero in the memory
@@ -971,6 +978,16 @@ struct vmbus_channel { 
	bool is_dedicated_interrupt;

	struct hv_input_signal_event_buffer sig_buf;

	struct hv_input_signal_event *sig_event;



	/*

	 * Starting with win8, this field will be used to specify

	 * the target virtual processor on which to deliver the interrupt for

	 * the host to guest communication.

	 * Prior to win8, incoming channel interrupts would only

	 * be delivered on cpu 0. Setting this value to 0 would

	 * preserve the earlier behavior.

	 */

	u32 target_vp;

};



static inline void set_channel_read_state(struct vmbus_channel *c, bool state)