Drivers: hv: vmbus: Implement per-CPU mapping of relid to channel

Currently the mapping of the relID to channel is done under the protection of a
single spin lock. Starting with ws2012, each channel is bound to a specific VCPU
in the guest. Use this binding to eliminate the spin lock by setting up
per-cpu state for mapping relId to the channel.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/hv/channel_mgmt.c
Simple merge

diff --cc drivers/hv/connection.c
Simple merge

diff --cc drivers/hv/hv.c
Simple merge

diff --cc drivers/hv/hyperv_vmbus.h
Simple merge

diff --cc include/linux/hyperv.h
Simple merge