Re: [PATCH v7 07/10] iommufd: Fault-capable hwpt attach/detach/replace

[Jason Gunthorpe]

On Sun, Jun 16, 2024 at 02:11:52PM +0800, Lu Baolu wrote:
> +static int iommufd_fault_iopf_enable(struct iommufd_device *idev)
> +{
> +	struct device *dev = idev->dev;
> +	int ret;
> +
> +	/*
> +	 * Once we turn on PCI/PRI support for VF, the response failure code
> +	 * should not be forwarded to the hardware due to PRI being a shared
> +	 * resource between PF and VFs. There is no coordination for this
> +	 * shared capability. This waits for a vPRI reset to recover.
> +	 */
> +	if (dev_is_pci(dev) && to_pci_dev(dev)->is_virtfn)
> +		return -EINVAL;

I don't quite get this remark, isn't not supporting PRI on VFs kind of
useless? What is the story here?

Jason