Re: [PATCH v11 08/12] PCI/CXL: Reject CXL Reset on multifunction devices

[Srirangan Madhavan]

On 9/4/26 2:26 AM, Richard Cheng wrote:
> > +	if (pdev->multifunction)
> > +		return -ENOTTY;
> > +
> >   	if (probe)
> >   		return 0;
> Hmm a PF can have a single-function PCI header while having many enabled VFs,
> and VFs enablement can change after reset-method probing.
>
> Since CXL Reset can affect VFs, do we have the mechanism to quiescie all VF?
>
> Best regards,
> Richard Cheng.

I see the issue.
In V12, it now conservatively rejects CXL Reset when either 
pdev->multifunction is set or pci_num_vf(pdev) reports enabled VFs. The 
check is repeated when the reset executes, so VFs enabled after 
reset-method probing are also caught. These changes do not attempt to 
quiesce active VFs.

--
Regards,
Srirangan