linux-kernel - Re: [PATCH v4 09/13] iommu/arm-smmu-v3: Implement set_dev

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Date:   Thu, 22 Jun 2023 17:32:01 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Michael Shavit <mshavit@...gle.com>
CC:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        "Joerg Roedel" <joro@...tes.org>, <jean-philippe@...aro.org>,
        <jgg@...dia.com>, <baolu.lu@...ux.intel.com>,
        <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 09/13] iommu/arm-smmu-v3: Implement set_dev_pasid

Hi Michael,

On Wed, Jun 21, 2023 at 02:37:21PM +0800, Michael Shavit wrote:
> 
> This change enables the use of the iommu_attach_dev_pasid API for
> UNMANAGED domains. The primary use-case is to allow in-kernel users of
> the iommu API to manage domains with PASID. This change also allows for
> future support of pasid in the DMA api.

Would you please elaborate a bit more for the use case of
allowing that? And which test configuration do you cover
using smmute? Would you mind sharing your test commands?

I have run a sanity with this series using an SVA domain
with a real master. It seems to be fine.

Thanks
Nicolin