linux-kernel - Re: [PATCH v7 0/5] Disable ATS via iommu during PCI resets

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Message-ID: <iovdqkgm7std6tpbfoolpkzksbc4hy3egfqgf6wbqmga2jlo7q@uolshjbvs3sm>
Date: Tue, 25 Nov 2025 15:22:03 +0100
From: Jörg Rödel <joro@...tes.org>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: afael@...nel.org, bhelgaas@...gle.com, alex@...zbot.org, 
	jgg@...dia.com, will@...nel.org, robin.murphy@....com, lenb@...nel.org, 
	kevin.tian@...el.com, baolu.lu@...ux.intel.com, linux-arm-kernel@...ts.infradead.org, 
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org, 
	linux-pci@...r.kernel.org, kvm@...r.kernel.org, patches@...ts.linux.dev, 
	pjaroszynski@...dia.com, vsethi@...dia.com, helgaas@...nel.org, etzhao1900@...il.com
Subject: Re: [PATCH v7 0/5] Disable ATS via iommu during PCI resets

On Fri, Nov 21, 2025 at 05:57:27PM -0800, Nicolin Chen wrote:
> Nicolin Chen (5):
>   iommu: Lock group->mutex in iommu_deferred_attach()
>   iommu: Tidy domain for iommu_setup_dma_ops()
>   iommu: Add iommu_driver_get_domain_for_dev() helper
>   iommu: Introduce pci_dev_reset_iommu_prepare/done()
>   PCI: Suspend iommu function prior to resetting a device
> 
>  drivers/iommu/dma-iommu.h                   |   5 +-
>  include/linux/iommu.h                       |  14 ++
>  include/uapi/linux/vfio.h                   |   4 +
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c |   5 +-
>  drivers/iommu/dma-iommu.c                   |   4 +-
>  drivers/iommu/iommu.c                       | 220 +++++++++++++++++++-
>  drivers/pci/pci-acpi.c                      |  13 +-
>  drivers/pci/pci.c                           |  65 +++++-
>  drivers/pci/quirks.c                        |  19 +-
>  9 files changed, 326 insertions(+), 23 deletions(-)

Looks good from an IOMMU perspective, but needs Ack from PCI side.

Regards,

	Joerg