Re: [Qemu-devel] [PATCH v1 6/7] kvm/x86: Hyper-V SynIC message slot pending clearing at SINT ack

[Roman Kagan]

On Wed, Nov 25, 2015 at 06:20:20PM +0300, Andrey Smetanin wrote:
> The SynIC message protocol mandates that the message slot is claimed
> by atomically setting message type to something other than HVMSG_NONE.
> If another message is to be delivered while the slot is still busy,
> message pending flag is asserted to indicate to the guest that the
> hypervisor wants to be notified when the slot is released.
> 
> To make sure the protocol works regardless of where the message
> sources are (kernel or userspace), clear the pending flag on SINT ACK
> notification, and let the message sources compete for the slot again.
> 
> Signed-off-by: Andrey Smetanin <address@hidden>
> CC: Gleb Natapov <address@hidden>
> CC: Paolo Bonzini <address@hidden>
> CC: "K. Y. Srinivasan" <address@hidden>
> CC: Haiyang Zhang <address@hidden>
> CC: Vitaly Kuznetsov <address@hidden>
> CC: Roman Kagan <address@hidden>
> CC: Denis V. Lunev <address@hidden>
> CC: address@hidden

Reviewed-by: Roman Kagan <address@hidden>

Roman.