[PATCH 0/5] Simplify vfio_iommu_type1 attach/detach routine

From: Nicolin Chen <nicolinc@nvidia.com>
To: <jgg@nvidia.com>, <joro@8bytes.org>, <will@kernel.org>,
	<marcan@marcan.st>, <sven@svenpeter.dev>, <robin.murphy@arm.com>,
	<robdclark@gmail.com>, <m.szyprowski@samsung.com>,
	<krzysztof.kozlowski@linaro.org>, <baolu.lu@linux.intel.com>,
	<agross@kernel.org>, <bjorn.andersson@linaro.org>,
	<matthias.bgg@gmail.com>, <heiko@sntech.de>,
	<orsonzhai@gmail.com>, <baolin.wang7@gmail.com>,
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	<jernej.skrabec@gmail.com>, <samuel@sholland.org>,
	<jean-philippe@linaro.org>, <alex.williamson@redhat.com>
Cc: <suravee.suthikulpanit@amd.com>, <alyssa@rosenzweig.io>,
	<alim.akhtar@samsung.com>, <dwmw2@infradead.org>,
	<yong.wu@mediatek.com>, <mjrosato@linux.ibm.com>,
	<gerald.schaefer@linux.ibm.com>, <thierry.reding@gmail.com>,
	<vdumpa@nvidia.com>, <jonathanh@nvidia.com>, <cohuck@redhat.com>,
	<iommu@lists.linux-foundation.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-arm-msm@vger.kernel.org>,
	<linux-samsung-soc@vger.kernel.org>,
	<linux-mediatek@lists.infradead.org>,
	<linux-rockchip@lists.infradead.org>,
	<linux-s390@vger.kernel.org>, <linux-sunxi@lists.linux.dev>,
	<linux-tegra@vger.kernel.org>,
	<virtualization@lists.linux-foundation.org>,
	<kvm@vger.kernel.org>
Subject: [PATCH 0/5] Simplify vfio_iommu_type1 attach/detach routine
Date: Sun, 5 Jun 2022 23:19:22 -0700	[thread overview]
Message-ID: <20220606061927.26049-1-nicolinc@nvidia.com> (raw)

This is a preparatory series for IOMMUFD v2 patches. It enforces error
code -EMEDIUMTYPE in iommu_attach_device() and iommu_attach_group() when
an IOMMU domain and a device/group are incompatible. It also moves the
domain->ops check into __iommu_attach_device(). These allow VFIO iommu
code to simplify its group attachment routine, by avoiding the extra
IOMMU domain allocations and attach/detach sequences of the old code.

Worths mentioning the exact match for enforce_cache_coherency is removed
with this series, since there's very less value in doing that since KVM
won't be able to take advantage of it -- this just wastes domain memory.
Instead, we rely on Intel IOMMU driver taking care of that internally.

This is on github: https://github.com/nicolinc/iommufd/commits/vfio_iommu_attach

Jason Gunthorpe (1):
  vfio/iommu_type1: Prefer to reuse domains vs match enforced cache
    coherency

Nicolin Chen (4):
  iommu: Return -EMEDIUMTYPE for incompatible domain and device/group
  iommu: Ensure device has the same iommu_ops as the domain
  vfio/iommu_type1: Clean up update_dirty_scope in detach_group()
  vfio/iommu_type1: Simplify group attachment

 drivers/iommu/amd/iommu.c                   |   3 +-
 drivers/iommu/apple-dart.c                  |   5 +-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c |   7 +-
 drivers/iommu/arm/arm-smmu/arm-smmu.c       |   1 +
 drivers/iommu/arm/arm-smmu/qcom_iommu.c     |   3 +-
 drivers/iommu/exynos-iommu.c                |   1 +
 drivers/iommu/fsl_pamu_domain.c             |   1 +
 drivers/iommu/intel/iommu.c                 |   5 +-
 drivers/iommu/iommu.c                       |  26 ++
 drivers/iommu/ipmmu-vmsa.c                  |   3 +-
 drivers/iommu/msm_iommu.c                   |   1 +
 drivers/iommu/mtk_iommu.c                   |   1 +
 drivers/iommu/mtk_iommu_v1.c                |   1 +
 drivers/iommu/omap-iommu.c                  |   3 +-
 drivers/iommu/rockchip-iommu.c              |   1 +
 drivers/iommu/s390-iommu.c                  |   1 +
 drivers/iommu/sprd-iommu.c                  |   1 +
 drivers/iommu/sun50i-iommu.c                |   1 +
 drivers/iommu/tegra-gart.c                  |   1 +
 drivers/iommu/tegra-smmu.c                  |   1 +
 drivers/iommu/virtio-iommu.c                |   3 +-
 drivers/vfio/vfio_iommu_type1.c             | 315 ++++++++++----------
 include/linux/iommu.h                       |   2 +
 23 files changed, 223 insertions(+), 164 deletions(-)

-- 
2.17.1