linux-kernel - Re: [PATCH RFCv2 09/13] iommufd: Add IOMMU_OPTION_SW_MSI

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Message-ID: <20250207143020.GR2960738@nvidia.com>
Date: Fri, 7 Feb 2025 10:30:20 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: Eric Auger <eric.auger@...hat.com>, will@...nel.org,
	robin.murphy@....com, kevin.tian@...el.com, tglx@...utronix.de,
	maz@...nel.org, alex.williamson@...hat.com, joro@...tes.org,
	shuah@...nel.org, reinette.chatre@...el.com, yebin10@...wei.com,
	apatel@...tanamicro.com, shivamurthy.shastri@...utronix.de,
	bhelgaas@...gle.com, anna-maria@...utronix.de, yury.norov@...il.com,
	nipun.gupta@....com, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
	patches@...ts.linux.dev, jean-philippe@...aro.org, mdf@...nel.org,
	mshavit@...gle.com, shameerali.kolothum.thodi@...wei.com,
	smostafa@...gle.com, ddutile@...hat.com
Subject: Re: [PATCH RFCv2 09/13] iommufd: Add IOMMU_OPTION_SW_MSI_START/SIZE
 ioctls

On Thu, Feb 06, 2025 at 08:26:05PM -0800, Nicolin Chen wrote:
> Yea, I found iopt_reserve_iova() is actually missed entirely...
> 
> While fixing this, I see a way to turn the OPTIONs back to per-
> idev, if you still prefer them to be per-idev(?). Then, we can
> check a given input in the set_option() against the device's
> reserved region list from the driver, prior to device attaching
> to any HWPT.

I didn't have a strong opinion, if the idev works without complexity
then I'd stick with that on the basis of narrower scope is usually
better.

Jason