linux-kernel - Re: [PATCH v7 1/3] iommufd: Add data structure for Intel VT-d stage-1 cache invalidation

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Date: Wed, 3 Jan 2024 20:02:04 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: Yi Liu <yi.l.liu@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
	"joro@...tes.org" <joro@...tes.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"robin.murphy@....com" <robin.murphy@....com>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
	"cohuck@...hat.com" <cohuck@...hat.com>,
	"eric.auger@...hat.com" <eric.auger@...hat.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>,
	"joao.m.martins@...cle.com" <joao.m.martins@...cle.com>,
	"Zeng, Xin" <xin.zeng@...el.com>,
	"Zhao, Yan Y" <yan.y.zhao@...el.com>
Subject: Re: [PATCH v7 1/3] iommufd: Add data structure for Intel VT-d
 stage-1 cache invalidation

On Wed, Jan 03, 2024 at 12:18:35PM -0800, Nicolin Chen wrote:
> > The driver would have to create it and there would be some driver
> > specific enclosing struct to go with it
> > 
> > Perhaps device_ids goes in the driver specific struct, I don't know.
> 
> +struct iommufd_viommu {
> +	struct iommufd_object obj;
> +	struct iommufd_ctx *ictx;
> +	struct iommu_device *iommu_dev;
> +	struct iommufd_hwpt_paging *hwpt;	/* maybe unneeded */
> +
> +	int vmid;
> +
> +	union iommu_driver_user_data {
> +		struct iommu_driver_user_vtd;
> +		struct iommu_driver_user_arm_smmuv3;
> +		struct iommu_driver_user_amd_viommu;
> +	};

Not like that, in the usual container_of way

Jason