Re: [PATCH v10 5/5] vfio: update live migration device status

[Jason Gunthorpe]

On Fri, Apr 21, 2023 at 11:07:53AM +0800, liulongfang wrote:
> On 2023/4/14 20:25, Jason Gunthorpe write:
> > On Sat, Apr 08, 2023 at 03:42:24PM +0800, Longfang Liu wrote:
> >> migration debugfs needs to perform debug operations based on the
> >> status of the current device. If the device is not loaded or has
> >> stopped, debugfs does not allow operations.
> >>
> >> so, after the live migration function is executed and the device is
> >> turned off, the device no longer needs to be accessed. At this time,
> >> the status of the device needs to be set to stop.
> > 
> > STOP means the devices isn't functioning
> > > An idle device that has just been reset is RUNNING by definiton.
> > 
> 
> After the vfio device is opened, it will be set to RUNNING, and after it
> is closed, it should be set to STOP according to the function of the
> device.

No, VFIO does not STOP anything, RUNNING means the PCI function is
operating normally, which is always how VFIO leaves it when the FD is
closed.

Jason