linux-kernel - Re: [PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT

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Message-ID: <20251230011916.GB23056@nvidia.com>
Date: Mon, 29 Dec 2025 21:19:16 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Linus Heckemann <linus@...reibt.jetzt>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>,
	Dave Jiang <dave.jiang@...el.com>, Vinod Koul <vkoul@...nel.org>,
	Fenghua Yu <fenghuay@...dia.com>,
	Zhangfei Gao <zhangfei.gao@...aro.org>,
	Zhou Wang <wangzhou1@...ilicon.com>, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Yi Liu <yi.l.liu@...el.com>
Subject: Re: [PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT_SVA

On Thu, Dec 25, 2025 at 10:05:59PM +0100, Linus Heckemann wrote:
> It appears the code removed here was not in fact entirely dead; my 2024
> gpd win mini ("G1617-01", with a Ryzen 8840U) fails to suspend
> correctly, and I bisected the issue to this commit.

The only behavior change this patch had that could be relavent to a
Ryzen was in drivers/accel/amdxdna/aie2_pci.c - are you using this
driver?

Prior to this patch amdxdna would have failed to load in configs
without an iommu as iommu_dev_enable_feature() would have
failed. After this patch it will load successfully.

If so then that driver presmuably doesn't have working power
management in your system.

Jason