linux-kernel - Re: [RFC PATCH v1 06/38] iommufd: Add and option to request for bar mapping with IORESOURCE

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Message-ID: <6893c6b8a921_cff99100d7@dwillia2-xfh.jf.intel.com.notmuch>
Date: Wed, 6 Aug 2025 14:18:48 -0700
From: <dan.j.williams@...el.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>,
	<linux-coco@...ts.linux.dev>, <kvmarm@...ts.linux.dev>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<aik@....com>, <lukas@...ner.de>, Samuel Ortiz <sameo@...osinc.com>, Xu Yilun
	<yilun.xu@...ux.intel.com>, Jason Gunthorpe <jgg@...pe.ca>, Suzuki K Poulose
	<Suzuki.Poulose@....com>, Steven Price <steven.price@....com>, "Catalin
 Marinas" <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>, Will
 Deacon <will@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, "Aneesh
 Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
Subject: Re: [RFC PATCH v1 06/38] iommufd: Add and option to request for bar
 mapping with IORESOURCE_EXCLUSIVE

Aneesh Kumar K.V (Arm) wrote:
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>
> ---
>  drivers/iommu/iommufd/device.c          | 54 +++++++++++++++++++++++++
>  drivers/iommu/iommufd/iommufd_private.h |  4 ++
>  drivers/iommu/iommufd/main.c            |  3 ++
>  drivers/vfio/pci/vfio_pci_core.c        |  9 ++++-
>  include/linux/iommufd.h                 |  1 +
>  include/uapi/linux/iommufd.h            |  1 +
>  6 files changed, 71 insertions(+), 1 deletion(-)

I think we simply make the rule be something like this:

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 700addee8f62..d84158aacabf 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -138,6 +138,7 @@ config PCI_IDE_STREAM_MAX
 
 config PCI_TSM
 	bool "PCI TSM: Device security protocol support"
+	depends on IO_STRICT_DEVMEM
 	select PCI_IDE
 	select PCI_DOE
 	help

...i.e. the base expectation is there is only ever one owner of
potentially private MMIO space.