From: Jason Gunthorpe <jgg@ziepe.ca>
To: Alexey Kardashevskiy <aik@amd.com>
Cc: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>,
linux-coco@lists.linux.dev, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
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 09/11] iommufd: Add the vdevice TSM request ioctl
Date: Fri, 18 Sep 2026 10:13:27 -0300 [thread overview]
Message-ID: <20260918131327.GB11599@ziepe.ca> (raw)
In-Reply-To: <f6fb7f1e-a296-4142-9b77-64420edabe64@amd.com>
On Fri, Sep 18, 2026 at 11:09:29PM +1000, Alexey Kardashevskiy wrote:
>
>
> On 18/9/26 00:01, Aneesh Kumar K.V (Arm) wrote:
> > A VMM needs to forward guest-originated TSM commands to the TSM
> > implementation managing an assigned device. The IOMMUFD vdevice
> > identifies that device within its vIOMMU and provides the appropriate
> > dispatch point.
> >
> > Add IOMMU_VDEVICE_TSM_REQ to send an opaque request to a vdevice and
> > optionally return a response. Define common operation and guest
> > architecture identifiers for CCA, SEV and TDX requests.
>
> iommufd_viommu_provider_ops already knows what architecture it is,
> why bother with these identifiers? Thanks,
At the uAPI boundary we want something like a strace to be able to
dump and inspect the system call without having to inspect hidden
knowledge of what is inside the FD. That's a huge PITA.
So saything 'this is an x86 format request that uses this coding' is
the right thing.
Jason
next prev parent reply other threads:[~2026-09-18 13:13 UTC|newest]
Thread overview: 72+ 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
2026-09-30 7:19 ` Aneesh Kumar K.V
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)
2026-09-30 13:28 ` Vasant Hegde
2026-10-02 5:26 ` Aneesh Kumar K.V
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
2026-09-29 23:15 ` Jacob Pan
2026-09-29 23:30 ` Jason Gunthorpe
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 [this message]
2026-09-24 19:41 ` Jason Gunthorpe
2026-09-30 8:03 ` Aneesh Kumar K.V
2026-09-30 13:26 ` Vasant Hegde
2026-09-30 14:03 ` Jason Gunthorpe
2026-09-30 14:08 ` 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
2026-10-02 6:14 ` Aneesh Kumar K.V
2026-10-02 13:06 ` 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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