From: Cornelia Huck <cohuck@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>, Parav Pandit <parav@nvidia.com>
Cc: "virtio-dev@lists.oasis-open.org"
<virtio-dev@lists.oasis-open.org>,
Max Gurtovoy <mgurtovoy@nvidia.com>,
Shahaf Shuler <shahafs@nvidia.com>, Oren Duer <oren@nvidia.com>
Subject: [virtio-dev] Re: [PATCH v2] Add device reset timeout field
Date: Fri, 08 Oct 2021 13:47:40 +0200 [thread overview]
Message-ID: <87lf33ybz7.fsf@redhat.com> (raw)
In-Reply-To: <20211008071903-mutt-send-email-mst@kernel.org>
On Fri, Oct 08 2021, "Michael S. Tsirkin" <mst@redhat.com> wrote:
> On Fri, Oct 08, 2021 at 10:59:02AM +0000, Parav Pandit wrote:
>> It may be even a pre-boot environment where 100msec or 10msec may be too short interval as other extreme of VM boot time example.
>
> I don't really know what this means. We are talking about how long
> it takes device to calm down and stop poking at the host
> after it's told to reset. 10ms worst case not enough for this?
To me, that sounded more like a physical device that needs to do
something like boot its firmware before it can perform an actual virtio
operation (and reset simply happens to be the first one.)
So, I'm getting more confused about the scope of this timeout. If it's
more a "device might not be ready yet" issue, I don't think we need a
timeout for reset specifically. Same for races with hotplugging. If it's
about "reset may take some time, because it will take some time before
all operations have quiesced", I don't see how the device can come up
with a value that isn't anything other than a wild guess, and the driver
could do wild guessing equally well.
I feel like I'm missing something.
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next prev parent reply other threads:[~2021-10-08 11:47 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-06 14:10 [PATCH v2] Add device reset timeout field Parav Pandit
2021-10-06 15:22 ` Michael S. Tsirkin
2021-10-06 16:11 ` Parav Pandit
2021-10-06 20:53 ` Michael S. Tsirkin
2021-10-07 3:42 ` Parav Pandit
2021-10-07 16:10 ` [virtio-dev] " Cornelia Huck
2021-10-07 17:58 ` Parav Pandit
2021-10-08 10:00 ` [virtio-dev] " Cornelia Huck
2021-10-08 10:19 ` Parav Pandit
2021-10-08 10:12 ` Michael S. Tsirkin
2021-10-08 10:51 ` Parav Pandit
2021-10-08 11:18 ` [virtio-dev] " Michael S. Tsirkin
2021-10-08 12:55 ` Parav Pandit
2021-10-08 10:44 ` Michael S. Tsirkin
2021-10-08 10:59 ` Parav Pandit
2021-10-08 11:21 ` Michael S. Tsirkin
2021-10-08 11:45 ` Parav Pandit
2021-10-08 11:47 ` Cornelia Huck [this message]
2021-10-08 12:12 ` Parav Pandit
2021-10-08 12:57 ` Michael S. Tsirkin
2021-10-08 13:23 ` Parav Pandit
2021-10-08 23:09 ` Michael S. Tsirkin
2021-10-11 14:29 ` Parav Pandit
2021-10-11 14:59 ` [virtio-dev] " Cornelia Huck
2021-10-11 15:44 ` Parav Pandit
2021-10-11 16:00 ` Michael S. Tsirkin
2021-10-12 8:51 ` Parav Pandit
2021-10-12 9:01 ` Michael S. Tsirkin
2021-10-12 9:12 ` Parav Pandit
2021-10-14 17:35 ` Parav Pandit
2021-10-14 22:28 ` Michael S. Tsirkin
2021-10-15 4:36 ` Parav Pandit
2021-10-15 5:15 ` [virtio-dev] " Jason Wang
2021-10-15 5:20 ` Parav Pandit
2021-10-15 6:40 ` Jason Wang
2021-10-15 6:42 ` Jason Wang
2021-10-15 6:48 ` Parav Pandit
2021-10-15 7:02 ` Jason Wang
2021-10-15 8:21 ` Parav Pandit
2021-10-15 8:42 ` Jason Wang
2021-10-22 7:20 ` Parav Pandit
2021-10-25 5:41 ` Jason Wang
2021-10-25 6:11 ` Parav Pandit
2021-10-26 4:03 ` Jason Wang
2021-10-27 8:04 ` Parav Pandit
2021-10-27 8:26 ` Michael S. Tsirkin
2021-10-28 4:01 ` Parav Pandit
2021-10-28 5:50 ` Michael S. Tsirkin
2021-10-28 6:06 ` Parav Pandit
2021-10-15 6:51 ` Cornelia Huck
2021-10-15 8:09 ` Parav Pandit
2021-10-15 9:25 ` [virtio-dev] " Cornelia Huck
2021-10-22 6:29 ` Parav Pandit
2021-10-11 16:22 ` [virtio-dev] " Cornelia Huck
2021-10-12 10:35 ` Parav Pandit
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