linux-kernel - Re: [PATCH v10 3/5] hisi_acc_vfio_pci: register debugfs for hisilicon migration driver

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Date:   Tue, 16 May 2023 08:50:45 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     liulongfang <liulongfang@...wei.com>
Cc:     alex.williamson@...hat.com, shameerali.kolothum.thodi@...wei.com,
        jonathan.cameron@...wei.com, cohuck@...hat.com,
        linux-kernel@...r.kernel.org, linuxarm@...neuler.org
Subject: Re: [PATCH v10 3/5] hisi_acc_vfio_pci: register debugfs for
 hisilicon migration driver

On Tue, May 16, 2023 at 05:40:36PM +0800, liulongfang wrote:
> On 2023/4/21 22:31, Jason Gunthorpe wrote:
> > On Fri, Apr 21, 2023 at 11:32:47AM +0800, liulongfang wrote:
> > 
> >> Thank you for your suggestion, but the current debugfs method can already
> >> meet the functional requirements of verification testing and
> >> problem location.
> > 
> > To be clear, I'm against adding selftest code in this manner. We have
> > many frameworks for kernel teesting, please pick one and integrate
> > with it.
> > 
> 
> Hi, Jason:
> The purpose of this hisi_acc_vf_debug_restore function is to obtain the
> migration status data of the migration device. It is a debug operation.
> Just to obtain this status data, user need to complete the few steps
> of live migration.
> Therefore, it is a debug function here, not a self-test function.

A debug function should not alter the device state, or do a trial migration.

Jason