linux-kernel - RE: [PATCH v6 04/10] iommufd/device: Wrap IOMMUFD_OBJ_HWPT

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Date:   Wed, 25 Oct 2023 06:46:20 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
CC:     "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>,
        "Martins, Joao" <joao.m.martins@...cle.com>
Subject: RE: [PATCH v6 04/10] iommufd/device: Wrap
 IOMMUFD_OBJ_HWPT_PAGING-only configurations

> From: Liu, Yi L <yi.l.liu@...el.com>
> Sent: Tuesday, October 24, 2023 11:06 PM
> +
> +static int iommufd_group_do_replace_paging(struct iommufd_group
> *igroup,
> +					   struct iommufd_hw_pagetable
> *hwpt)
> +{
> +	struct iommufd_hw_pagetable *old_hwpt = igroup->hwpt;
> +	struct iommufd_device *cur;
> +	int rc;
> +
> +	lockdep_assert_held(&igroup->lock);
> +
> +	if (hwpt_is_paging(old_hwpt) && hwpt->ioas != old_hwpt->ioas) {
> +		list_for_each_entry(cur, &igroup->device_list, group_item) {
> +			rc = iopt_table_enforce_dev_resv_regions(
> +				&hwpt->ioas->iopt, cur->dev, NULL);
> +			if (rc)
> +				goto err_unresv;
> +		}

should be:

	if (!hwpt_is_paging(old_hwpt) || hwpt->ioas != old_hwpt->ioas) {
		...