From: Jason Gunthorpe <jgg@nvidia.com>
To: Jacob Pan <jacob.pan@linux.microsoft.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
linux-coco@lists.linux.dev, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Alexey Kardashevskiy <aik@amd.com>,
Bjorn Helgaas <helgaas@kernel.org>,
Joerg Roedel <joro@8bytes.org>,
Jonathan Cameron <jic23@kernel.org>,
Kevin Tian <kevin.tian@intel.com>,
Nicolin Chen <nicolinc@nvidia.com>,
Samuel Ortiz <sameo@rivosinc.com>,
Steven Price <steven.price@arm.com>,
Suzuki K Poulose <Suzuki.Poulose@arm.com>,
Will Deacon <will@kernel.org>,
Xu Yilun <yilun.xu@linux.intel.com>,
Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [RFC PATCH v6 05/11] iommu: Add a helper to validate a vIOMMU parent
Date: Tue, 29 Sep 2026 09:30:48 -0300 [thread overview]
Message-ID: <20260929123048.GJ1616761@nvidia.com> (raw)
In-Reply-To: <20260928225524.00002b85@linux.microsoft.com>
On Mon, Sep 28, 2026 at 10:55:24PM -0700, Jacob Pan wrote:
> Also, we don't have a T=0 to T=1 transition, our intended external
> attach can be transitioned from a blocked domain, not from a paging
> domain to external.
You kind of do, external is close to T=1..
> > I think you are going to have module dependency issues trying to get
> > the mshv driver's info into the iommu driver, adding a "TSM" like
> > driver would resolve that. ie mshv could just provide the viommu.
> >
> I introduced a similar registration interface in hv-common to solve the
> module dep issue. Will look into if I can leverage the vIOMMU helper
> here.
That doesn't sound so nice..
If we have to have registrations it is better to have the viommu
registration that Aneesh drafted than several schemes inside specific
drivers..
Jason
next prev parent reply other threads:[~2026-09-29 12:31 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-17 14:01 [RFC PATCH v6 00/11] iommufd: Infrastructure for vIOMMU creation for confidential guests and guest TSM requests Aneesh Kumar K.V (Arm)
2026-09-17 14:01 ` [RFC PATCH v6 01/11] vfio: cache KVM VM file references instead of raw struct kvm pointers Aneesh Kumar K.V (Arm)
2026-09-24 19:41 ` Jason Gunthorpe
2026-09-17 14:01 ` [RFC PATCH v6 02/11] vfio: cdev: Reject duplicate bind before updating KVM file Aneesh Kumar K.V (Arm)
2026-09-24 7:53 ` Tian, Kevin
2026-09-25 5:49 ` Aneesh Kumar K.V
2026-09-17 14:01 ` [RFC PATCH v6 03/11] iommufd/device: Associate KVM file pointer with iommufd_device Aneesh Kumar K.V (Arm)
2026-09-17 14:01 ` [RFC PATCH v6 04/11] iommufd/viommu: Keep a reference to the KVM file Aneesh Kumar K.V (Arm)
2026-09-17 14:01 ` [RFC PATCH v6 05/11] iommu: Add a helper to validate a vIOMMU parent Aneesh Kumar K.V (Arm)
2026-09-24 19:41 ` Jason Gunthorpe
2026-09-25 5:48 ` Aneesh Kumar K.V
2026-09-25 12:23 ` Jason Gunthorpe
2026-09-28 10:36 ` Aneesh Kumar K.V
2026-09-28 12:11 ` Jason Gunthorpe
2026-09-28 15:39 ` Aneesh Kumar K.V
2026-09-28 16:17 ` Jason Gunthorpe
2026-09-28 18:08 ` Jacob Pan
2026-09-28 18:20 ` Jason Gunthorpe
2026-09-28 22:24 ` Jacob Pan
2026-09-28 23:03 ` Jason Gunthorpe
2026-09-29 5:55 ` Jacob Pan
2026-09-29 12:30 ` Jason Gunthorpe [this message]
2026-09-17 14:01 ` [RFC PATCH v6 06/11] iommu: Add a helper to query vIOMMU hardware parameters Aneesh Kumar K.V (Arm)
2026-09-24 19:41 ` Jason Gunthorpe
2026-09-25 5:59 ` Aneesh Kumar K.V
2026-09-25 12:29 ` Jason Gunthorpe
2026-09-17 14:01 ` [RFC PATCH v6 07/11] coco: tsm: Expose active-user lifetime references Aneesh Kumar K.V (Arm)
2026-09-17 14:01 ` [RFC PATCH v6 08/11] iommufd: Add vIOMMU provider support Aneesh Kumar K.V (Arm)
2026-09-24 19:41 ` Jason Gunthorpe
2026-09-25 6:08 ` Aneesh Kumar K.V
2026-09-25 12:39 ` Jason Gunthorpe
2026-09-28 3:41 ` Tian, Kevin
2026-09-29 6:14 ` Aneesh Kumar K.V
2026-09-29 12:17 ` Jason Gunthorpe
2026-09-29 12:45 ` Aneesh Kumar K.V
2026-09-29 13:06 ` Jason Gunthorpe
2026-09-29 15:58 ` Aneesh Kumar K.V
2026-09-29 19:10 ` Jason Gunthorpe
2026-09-28 10:51 ` Aneesh Kumar K.V
2026-09-17 14:01 ` [RFC PATCH v6 09/11] iommufd: Add the vdevice TSM request ioctl Aneesh Kumar K.V (Arm)
2026-09-18 13:09 ` Alexey Kardashevskiy
2026-09-18 13:13 ` Jason Gunthorpe
2026-09-24 19:41 ` Jason Gunthorpe
2026-09-17 14:01 ` [RFC PATCH v6 10/11] PCI/TSM: Remove the legacy guest request interface Aneesh Kumar K.V (Arm)
2026-09-17 14:01 ` [RFC PATCH v6 11/11] PCI/TSM: Add reference-counted contexts for vdevice providers Aneesh Kumar K.V (Arm)
2026-09-24 8:17 ` Tian, Kevin
2026-09-24 19:41 ` Jason Gunthorpe
2026-09-25 8:15 ` Aneesh Kumar K.V
2026-09-28 18:47 ` Sonang Patel
2026-09-28 23:08 ` Jason Gunthorpe
2026-09-17 14:17 ` [RFC PATCH v6 00/11] iommufd: Infrastructure for vIOMMU creation for confidential guests and guest TSM requests Aneesh Kumar K.V
2026-09-24 7:48 ` Tian, Kevin
2026-09-24 19:20 ` Jason Gunthorpe
2026-09-28 3:35 ` Tian, Kevin
2026-09-28 13:08 ` Jason Gunthorpe
2026-09-25 8:29 ` Aneesh Kumar K.V
2026-09-28 3:41 ` Tian, Kevin
2026-09-28 3:55 ` Tian, Kevin
2026-09-24 19:09 ` Jason Gunthorpe
2026-09-25 6:46 ` Aneesh Kumar K.V
2026-09-25 12:45 ` Jason Gunthorpe
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