linux-kernel - Re: [PATCH v2 03/19] iommu: Pass in a viommu pointer to domain_alloc

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Message-ID: <20240905155454.GN1358970@nvidia.com>
Date: Thu, 5 Sep 2024 12:54:54 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, will@...nel.org, joro@...tes.org,
	suravee.suthikulpanit@....com, robin.murphy@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, shuah@...nel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, eric.auger@...hat.com,
	jean-philippe@...aro.org, mdf@...nel.org, mshavit@...gle.com,
	shameerali.kolothum.thodi@...wei.com, smostafa@...gle.com,
	yi.l.liu@...el.com
Subject: Re: [PATCH v2 03/19] iommu: Pass in a viommu pointer to
 domain_alloc_user op

On Tue, Aug 27, 2024 at 09:59:40AM -0700, Nicolin Chen wrote:
> With a viommu object wrapping a potentially shareable S2 domain, a nested
> domain should be allocated by associating to a viommu instead. Driver can
> store this viommu pointer somewhere, so as to later use it calling viommu
> helpers for virtual device ID lookup and viommu invalidation.
> 
> For drivers without a viommu support, keep the parent domain input, which
> should be just viommu->hwpt->common.domain otherwise.

I've been thinking of add an op for nested allocation since every
driver immediately jumps to a special function for nested allocation
anyhow without sharing any code.

Adding a new parameter that is nested only seems like a good point to
try to do that..

Jason