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Re: [Qemu-block] [PATCH v3 12/12] virtio-scsi-dataplane: Add "device IO"
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-block] [PATCH v3 12/12] virtio-scsi-dataplane: Add "device IO" op blocker listener |
Date: |
Fri, 15 May 2015 09:26:49 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
On 15/05/2015 09:03, Fam Zheng wrote:
> On Fri, 05/15 08:50, Paolo Bonzini wrote:
>>
>>
>> On 15/05/2015 08:04, Fam Zheng wrote:
>>> @@ -111,6 +111,10 @@ static void
>>> virtio_scsi_iothread_handle_ctrl(EventNotifier *notifier)
>>> VirtIOSCSI *s = VIRTIO_SCSI(vring->parent);
>>> VirtIOSCSIReq *req;
>>>
>>> + if (s->pause_counter) {
>>> + virtio_scsi_stop_ioeventfd(s);
>>> + return;
>>> + }
>>> event_notifier_test_and_clear(notifier);
>>> while ((req = virtio_scsi_pop_req_vring(s, vring))) {
>>> virtio_scsi_handle_ctrl_req(s, req);
>>> @@ -124,6 +128,10 @@ static void
>>> virtio_scsi_iothread_handle_event(EventNotifier *notifier)
>>> VirtIOSCSI *s = vring->parent;
>>> VirtIODevice *vdev = VIRTIO_DEVICE(s);
>>>
>>> + if (s->pause_counter) {
>>> + virtio_scsi_stop_ioeventfd(s);
>>> + return;
>>> + }
>>> event_notifier_test_and_clear(notifier);
>>>
>>> if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
>>
>> Why are these needed?
>
> Not strictly. I think it's something like an "assert(!s->pause_counter)" but
> said gently.
Why be gentle? :)
Paolo
- [Qemu-block] [PATCH v3 08/12] blockdev: Block device IO during external snapshot transaction, (continued)
- [Qemu-block] [PATCH v3 08/12] blockdev: Block device IO during external snapshot transaction, Fam Zheng, 2015/05/15
- [Qemu-block] [PATCH v3 07/12] blockdev: Block device IO during internal snapshot transaction, Fam Zheng, 2015/05/15
- [Qemu-block] [PATCH v3 09/12] blockdev: Block device IO during drive-backup transaction, Fam Zheng, 2015/05/15
- [Qemu-block] [PATCH v3 11/12] block: Block "device IO" during bdrv_drain and bdrv_drain_all, Fam Zheng, 2015/05/15
- [Qemu-block] [PATCH v3 10/12] blockdev: Block device IO during blockdev-backup transaction, Fam Zheng, 2015/05/15
- [Qemu-block] [PATCH v3 04/12] virtio-blk: Move complete_request to 'ops' structure, Fam Zheng, 2015/05/15
- [Qemu-block] [PATCH v3 12/12] virtio-scsi-dataplane: Add "device IO" op blocker listener, Fam Zheng, 2015/05/15