linux-kernel - Re: [virtio-dev] Re: [virtio-comment] Re: [VIRTIO PCI PATCH v5 1/1] transport-pci: Add freeze_mode to virtio_pci_common

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Date:   Wed, 20 Sep 2023 15:47:29 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     Parav Pandit <parav@...dia.com>,
        "Chen, Jiqian" <Jiqian.Chen@....com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        David Airlie <airlied@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>,
        Marc-André Lureau <marcandre.lureau@...il.com>,
        Robert Beckett <bob.beckett@...labora.com>,
        Mikhail Golubev-Ciuchea <Mikhail.Golubev-Ciuchea@...nsynergy.com>,
        "virtio-comment@...ts.oasis-open.org" 
        <virtio-comment@...ts.oasis-open.org>,
        "virtio-dev@...ts.oasis-open.org" <virtio-dev@...ts.oasis-open.org>,
        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Roger Pau Monné <roger.pau@...rix.com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Hildebrand, Stewart" <Stewart.Hildebrand@....com>,
        Xenia Ragiadakou <burzalodowa@...il.com>,
        "Huang, Honglei1" <Honglei1.Huang@....com>,
        "Zhang, Julia" <Julia.Zhang@....com>,
        "Huang, Ray" <Ray.Huang@....com>
Subject: Re: [virtio-dev] Re: [virtio-comment] Re: [VIRTIO PCI PATCH v5 1/1]
 transport-pci: Add freeze_mode to virtio_pci_common_cfg



On 9/20/2023 3:35 PM, Parav Pandit wrote:
>> From: Zhu, Lingshan <lingshan.zhu@...el.com>
>> Sent: Wednesday, September 20, 2023 1:00 PM
>>
>> On 9/20/2023 3:24 PM, Chen, Jiqian wrote:
>>> Hi Lingshan,
>>> It seems you reply to the wrong email thread. They are not related to my
>> patch.
>> These reply to Parva's comments.
>> @Parva, if you want to discuss more about live migration, please reply in my
>> thread, lets don't flood here.
> You made the point that "this is not live migration".
> I am not discussing live migration in this thread.
>
> I replied for the point that device restoration from suspend for physical and hypevisor based device is not a 40nsec worth of work to restore by just doing a register write.
> This is not live or device migration. This is restoring the device context initiated by the driver owning the device.
restore the device context should be done by the hypervisor before 
setting DRIVER_OK and waking up the guest, not a concern here, out of spec