From: Nicolin Chen <nicolinc@nvidia.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
Cc: <iommu@lists.linux.dev>, <linux-kernel@vger.kernel.org>,
<kvm@vger.kernel.org>, Kevin Tian <kevin.tian@intel.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Bjorn Helgaas <helgaas@kernel.org>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
"Dan Williams" <dan.j.williams@intel.com>,
Alexey Kardashevskiy <aik@amd.com>,
Samuel Ortiz <sameo@rivosinc.com>,
Xu Yilun <yilun.xu@linux.intel.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
Suzuki K Poulose <Suzuki.Poulose@arm.com>,
"Steven Price" <steven.price@arm.com>
Subject: Re: [PATCH v2 1/3] iommufd/viommu: Allow associating a KVM VM fd with a vIOMMU
Date: Thu, 12 Mar 2026 23:15:16 -0700 [thread overview]
Message-ID: <abOrdFR4L2n334MR@Asurada-Nvidia> (raw)
In-Reply-To: <20260309111704.2330479-2-aneesh.kumar@kernel.org>
On Mon, Mar 09, 2026 at 04:47:02PM +0530, Aneesh Kumar K.V (Arm) wrote:
> Add optional KVM association to IOMMU_VIOMMU_ALLOC by introducing
> IOMMU_VIOMMU_KVM_FD and iommu_viommu_alloc::kvm_vm_fd.
>
> When the flag is set, iommufd validates that kvm_vm_fd refers to a KVM
> VM file and stores a referenced struct file in the vIOMMU object, so
> later iommufd operations can safely resolve the owning VM.
>
> This is preparatory plumbing for subsequent patches that bind TDI state
> to the associated KVM VM.
>
> The patch also switch file_is_kvm from EXPORT_SYMBOL_FOR_KVM_INTERNAL to
> EXPORT_SYMBOL_GPL so that iommu module can use that.
struct vfio_device has the kvm pointer already. So, I think it
could be forwarded from VFIO side v.s. via userspace ioctl.
Shammer had two patches before and Jason partially reviewed. I
took those for a side project but haven't sent anywhere. Would
you please check if they for you?
https://github.com/nicolinc/iommufd/commits/wip/viommu_kvm
Nicolin
next prev parent reply other threads:[~2026-03-13 6:15 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-09 11:17 [PATCH v2 0/3] Add iommufd ioctls to support TSM operations Aneesh Kumar K.V (Arm)
2026-03-09 11:17 ` [PATCH v2 1/3] iommufd/viommu: Allow associating a KVM VM fd with a vIOMMU Aneesh Kumar K.V (Arm)
2026-03-11 21:18 ` Jonathan Cameron
2026-03-13 18:27 ` Jason Gunthorpe
2026-03-13 6:15 ` Nicolin Chen [this message]
2026-03-13 18:34 ` Jason Gunthorpe
2026-03-16 5:49 ` Aneesh Kumar K.V
2026-03-13 18:31 ` Jason Gunthorpe
2026-03-09 11:17 ` [PATCH v2 2/3] iommufd/tsm: add vdevice TSM bind/unbind ioctl Aneesh Kumar K.V (Arm)
2026-03-11 21:35 ` Jonathan Cameron
2026-03-13 18:42 ` Jason Gunthorpe
2026-03-13 18:48 ` Jason Gunthorpe
2026-03-16 7:12 ` Tian, Kevin
2026-03-16 8:45 ` Aneesh Kumar K.V
2026-03-09 11:17 ` [PATCH v2 3/3] iommufd/vdevice: add TSM guest request ioctl Aneesh Kumar K.V (Arm)
2026-03-11 21:43 ` Jonathan Cameron
2026-03-13 18:46 ` Jason Gunthorpe
2026-03-13 18:49 ` Jason Gunthorpe
2026-03-13 22:17 ` Dan Williams
2026-03-16 7:25 ` Tian, Kevin
2026-03-16 5:47 ` Aneesh Kumar K.V
2026-03-16 7:28 ` Tian, Kevin
2026-03-16 7:31 ` Tian, Kevin
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