RE: [PATCH v2 08/12] iommufd/selftest: Put iopf enablement in domain attach path

[Tian, Kevin]

> From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Monday, February 24, 2025 1:16 PM
> 
> Update iopf enablement in the iommufd mock device driver to use the new
> method, similar to the arm-smmu-v3 driver. Enable iopf support when any
> domain with an iopf_handler is attached, and disable it when the domain
> is removed.
> 
> Add a refcount in the mock device state structure to keep track of the
> number of domains set to the device and PASIDs that require iopf.
> 
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

with a nit:

> 
> +	ret = mock_dev_enable_iopf(dev, domain);
> +	if (ret)
> +		return ret;
> +
> +	mock_dev_disable_iopf(dev, mdev->domain);

You could use the same trick to simplify iopf_for_domain_replace()
in patch7?