1. 24 Jun, 2013 2 commits
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    • K. Y. Srinivasan's avatar
      Drivers: hv: vmbus: Implement multi-channel support · e68d2971
      K. Y. Srinivasan authored
      Starting with Win8, the host supports multiple sub-channels for a given
      device. As in the past, the initial channel offer specifies the device and
      is associated with both the type and the instance GUIDs. For performance
      critical devices, the host may support multiple sub-channels. The sub-channels
      share the same type and instance GUID as the primary channel. The number of
      sub-channels offerrred to the guest depends on the number of virtual CPUs
      assigned to the guest. The guest can request the creation of these sub-channels
      and once created and opened, the guest can distribute the traffic across all
      the channels (the primary and the sub-channels). A request sent on a sub-channel
      will have the response delivered on the same sub-channel.
      
      At channel (sub-channel) creation we bind the channel interrupt to a CPU and
      with this sub-channel support we will be able to spread the interrupt load
      of a given device across all available CPUs.
      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>
      e68d2971
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