[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [RFC PATCH 6/7] virtio-blk: Don't handle output when th

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC PATCH 6/7] virtio-blk: Don't handle output when there is "device IO" op blocker
Date: Wed, 06 May 2015 14:07:39 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 06/05/2015 13:23, Fam Zheng wrote:
> virtio-blk now listens to op blocker change of the associated block
> backend.
> Up on setting op blocker on BLOCK_OP_TYPE_DEVICE_IO:
>   non-dataplane:
>    1) Set VirtIOBlock.paused
>    2) In virtio_blk_handle_output, do nothing if VirtIOBlock.paused
>   dataplane:
>    1) Clear the host event notifier
>    2) In handle_notify, do nothing if VirtIOBlock.paused
> Up on removing the op blocker:
>   non-dataplane:
>    1) Clear VirtIOBlock.paused
>    2) Schedule a BH on the AioContext of the backend, which calls
>    virtio_blk_handle_output, so that the previous unhandled kicks can
>    make progress
>   dataplane:
>    1) Set the host event notifier
>    2) Notify the host event notifier so that unhandled events are
>    processed
> Signed-off-by: Fam Zheng <address@hidden>

Does non-dataplane need to do anything, since it uses iohandlers rather
than aio_set_event_notifier_handler?


reply via email to

[Prev in Thread] Current Thread [Next in Thread]