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 15:55:46 +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 3:51 PM, Parav Pandit wrote:
>> From: Zhu, Lingshan <lingshan.zhu@...el.com>
>> Sent: Wednesday, September 20, 2023 1:17 PM
>>> 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
> The framework is generic for the PCI devices hence, there may not be any hypervisor at all. Hence restore operation to trigger on DRIVER_OK setting, when previously suspended.
>
> Since we already agree in previous email that re-read until device sets the DRIVER_OK, its fine to me. It covers the above restore condition.
OK
>
> Thanks.
>