linux-kernel - Re: [virtio-comment] 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 08:18:27 +0000
From:   "Chen, Jiqian" <Jiqian.Chen@....com>
To:     Parav Pandit <parav@...dia.com>,
        "Chen, Jiqian" <Jiqian.Chen@....com>,
        "Zhu, Lingshan" <lingshan.zhu@...el.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-comment] RE: [virtio-dev] Re: [virtio-comment] Re:
 [VIRTIO PCI PATCH v5 1/1] transport-pci: Add freeze_mode to
 virtio_pci_common_cfg



On 2023/9/20 15:56, Parav Pandit wrote:
> Hi Jiquian,
> 
>> From: Chen, Jiqian <Jiqian.Chen@....com>
>> Sent: Wednesday, September 20, 2023 1:24 PM
>>
>> Hi Lingshan,
>> Please reply to your own email thread, below are not related to my patches.
>> Thanks a lot.
> 
> They are related to your patch.
>  Both the patches have overlapping functionalities.
But Lingshan's patch is not meet my need. It clears the SUSPEND bit during reset.

> 
> You probably missed my previous response explaining the same at [1].
> 
> [1] https://lists.oasis-open.org/archives/virtio-comment/202309/msg00255.html
Yes, I didn't receive this response. 
After reading your responses, I think your concerns are below:
> The point is when driver tells to freeze, it is freeze command and not reset.
> So resume() should not invoke device_reset() when FREEZE+RESUME supported.
The modifications in my Qemu and kernel patches, I just set freeze_mode to be S3, and then when guest resume I can change the reset behavior according the S3 mode, see below callstack:
pci_pm_resume
	virtio_pci_restore
		virtio_device_restore
			virtio_reset_device(set 0 the device status and then call virtio_reset to reset device)
			drv->restore(virtio_gpu_restore)
So, reset will be done during the restore process(resume invoke the reset), and I want to affect the reset behavior during the restore process.

> 

-- 
Best regards,
Jiqian Chen.