Re: [virtio-comment] RE: [PATCH V2 3/6] virtio: dont reset vqs when SUSPEND

["Zhu, Lingshan" <lingshan.zhu@intel.com>]

On 11/22/2023 2:49 PM, Michael S. Tsirkin wrote:
> On Wed, Nov 22, 2023 at 09:51:45AM +0800, Zhu, Lingshan wrote:
>>
>> On 11/22/2023 5:18 AM, Michael S. Tsirkin wrote:
>>> On Tue, Nov 21, 2023 at 03:33:07PM +0800, Jason Wang wrote:
>>>>> Lingshan claimed that suspending device is for live migration in commit log and in discussion he portray it as some basic facility unrelated to device migration such as debug etc.
>>>>> Instead of claiming it as some non_device_migration facility does not make sense.
>>>> It is used for migration for sure.
>>> Well having a generic facility to stop device sounds like a nice thing.
>>> However the devil is in the detail. A lot of detail here seems very much
>>> tailored to a very specific implementation in mind.
>>> So thinking through how it will work e.g. for power management
>>> would be a good excercise to figure out how it should work in detail.
>>> Parav did you indicate at some point a virtio specific SUSPEND
>>> bit can be useful for PM? Could you share how it's better than
>>> transport level PM and what the requirements are?
>>> Thanks!
>> Do you mean letting the device enter a new power state when SUSPEND,
>> and such description in transport-pci.tex? Then resume normal
>> state on DRIVER_OK.
> That would be one example.
OK, I will look into this.
Roughly say in transport-pci.tex: When SUSPEND, the device MAY 
optionally enter a
power-saving state.

Please allow me some time working on the details
>


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