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 09:06:23 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...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"
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	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
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 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 12:58:48PM -0400, Jason Gunthorpe wrote:
> On Wed, Jan 03, 2024 at 08:48:46AM -0800, Nicolin Chen wrote:
> > > You can pass the ctx to the invalidate op, it is already implied
> > > because the passed iommu_domain is linked to a single iommufd ctx.
> > 
> > The device virtual id lookup API needs something similar, yet it
> > likely needs a viommu pointer (or its id) instead? As the table
> > is attached to a viommu while an ictx can have multiple viommus,
> > right?
> 
> Yes, when we get to an API for that it will have to be some op
> 'invalidate_viommu(..)' and it can get the necessary pointers.

OK! I will try that first.

> The viommu object will have to be some driver object like the
> iommu_domain.

I drafted something like this, linking it to struct iommu_device:

+struct iommufd_viommu {
+       struct iommufd_object obj;
+       struct iommufd_ctx *ictx;
+       struct iommu_device *iommu_dev;
+       struct iommufd_hwpt_paging *hwpt;
+       /* array of struct iommufd_device, indexed by device virtual id */
+       struct xarray device_ids;
+};

Thanks
Nicolin