linux-kernel - Re: [PATCH v7 27/28] iommu/tegra241-cmdqv: Add user-space use support

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Message-ID: <aG-CE0jUxK4k1FMb@google.com>
Date: Thu, 10 Jul 2025 09:04:19 +0000
From: Pranjal Shrivastava <praan@...gle.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: Nicolin Chen <nicolinc@...dia.com>, kevin.tian@...el.com,
	corbet@....net, will@...nel.org, bagasdotme@...il.com,
	robin.murphy@....com, joro@...tes.org, thierry.reding@...il.com,
	vdumpa@...dia.com, jonathanh@...dia.com, shuah@...nel.org,
	jsnitsel@...hat.com, nathan@...nel.org, peterz@...radead.org,
	yi.l.liu@...el.com, mshavit@...gle.com, zhangzekun11@...wei.com,
	iommu@...ts.linux.dev, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-tegra@...r.kernel.org, linux-kselftest@...r.kernel.org,
	patches@...ts.linux.dev, mochs@...dia.com, alok.a.tiwari@...cle.com,
	vasant.hegde@....com, dwmw2@...radead.org, baolu.lu@...ux.intel.com
Subject: Re: [PATCH v7 27/28] iommu/tegra241-cmdqv: Add user-space use support

On Fri, Jul 04, 2025 at 09:50:12AM -0300, Jason Gunthorpe wrote:
> On Thu, Jul 03, 2025 at 06:48:42PM +0000, Pranjal Shrivastava wrote:
> 
> > Ahh, thanks for this, that saved a lot of my time! And yes, I see some
> > functions in eventq.c calling the iopf_group_response which settles the
> > CMD_RESUME. So.. I assume these resume commands would be trapped and
> > *actually* executed through this or a similar path for vPRI. 
> 
> Yes, that is what Intel did. PRI has to be tracked in the kernel
> because we have to ack requests eventually. If the VMM crashes the
> kernel has to ack everything and try to clean up.
> 

I see.. thanks for clarifying!

> Also SMMUv3 does not support PRI today, just stall.
> 

Ack. Thanks!

> Jason
Praan