RE: [PATCH v11 3/4] hisi_acc_vfio_pci: register debugfs for hisilicon migration driver

[Shameerali Kolothum Thodi]

> -----Original Message-----
> From: liulongfang <liulongfang@xxxxxxxxxx>
> Sent: Monday, November 4, 2024 8:31 AM
> To: Alex Williamson <alex.williamson@xxxxxxxxxx>
> Cc: jgg@xxxxxxxxxx; Shameerali Kolothum Thodi
> <shameerali.kolothum.thodi@xxxxxxxxxx>; Jonathan Cameron
> <jonathan.cameron@xxxxxxxxxx>; kvm@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; linuxarm@xxxxxxxxxxxxx
> Subject: Re: [PATCH v11 3/4] hisi_acc_vfio_pci: register debugfs for hisilicon
> migration driver
[...]

> >>> +
> >>> +	seq_printf(seq,
> >>> +		 "acc device:\n"
> >>> +		 "guest driver load: %u\n"
> >>> +		 "device opened: %d\n"
> >>> +		 "migrate data length: %lu\n",
> >>> +		 hisi_acc_vdev->vf_qm_state,
> >>> +		 hisi_acc_vdev->dev_opened,
> >>> +		 debug_migf->total_length);
> >>
> >> This debugfs entry is described as returning the data from the last
> >> migration, but vf_qm_state and dev_opened are relative to the current
> >> device/guest driver state.  Both seem to have no relevance to the data
> >> in debug_migf.
> >>
> >
> > The benefit of dev_opened retention is that user can obtain the device
> status
> > during the cat migf_data operation.
> >
> 
> I will remove dev_opened in the next version.
> And hisi_acc_vdev->vf_qm_state is changed to debug_migf-
> >vf_data.vf_qm_state
> Keep information about whether the device driver in the Guest OS is loaded
> when live migration occurs.

I think you already get that when you dump debug_migf->vf_data.
So not required.

Thanks,
Shameer