Re: [PATCH v2 02/10] PCI/LUO: Create requested liveupdate device list

[Jason Gunthorpe]

On Tue, Sep 16, 2025 at 12:45:10AM -0700, Chris Li wrote:
>  static int pci_liveupdate_prepare(void *arg, u64 *data)
>  {
> +	LIST_HEAD(requested_devices);
> +
>  	pr_info("prepare data[%llx]\n", *data);
> +
> +	pci_lock_rescan_remove();
> +	down_write(&pci_bus_sem);
> +
> +	build_liveupdate_devices(&requested_devices);
> +	cleanup_liveupdate_devices(&requested_devices);
> +
> +	up_write(&pci_bus_sem);
> +	pci_unlock_rescan_remove();
>  	return 0;
>  }

This doesn't seem conceptually right, PCI should not be preserving
everything. Only devices and their related hierarchy that are opted
into live update by iommufd should be preserved.

Jason