From: Jason Gunthorpe <jgg@nvidia.com>
To: Alexey Kardashevskiy <aik@amd.com>
Cc: dan.j.williams@intel.com, Robin Murphy <robin.murphy@arm.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
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Subject: Re: [PATCH kernel 4/9] dma/swiotlb: Stop forcing SWIOTLB for TDISP devices
Date: Mon, 20 Apr 2026 20:50:46 -0300 [thread overview]
Message-ID: <20260420235046.GA3199414@nvidia.com> (raw)
In-Reply-To: <137e5595-390e-49a7-8918-9ca057f7ebdd@amd.com>
On Wed, Apr 15, 2026 at 04:32:14PM +1000, Alexey Kardashevskiy wrote:
> > > So the DMA API should see the DMA_ATTR_CC_DECRYPTED and setup the
> > > correct dma_dddr_t either by choosing the shared alias for the TDISP
> > > device's vTOM, or setting the C bit in a vIOMMU S1.
> >
> > Something like that?
> >
> > https://github.com/AMDESE/linux-kvm/commit/266a41a1ea746557eb63debce886ce2c98820667
> >
> > With some little hacks I can make this tree do TDISP DMA to private or shared (swiotlb) memory by steering via this vTOM thing. Thanks,
>
> Ping? Thanks,
That seems approx right, it is broadl similar to what ARM is
doing.. But the address map changes when switching to T=1 for AMD?
Jason
next prev parent reply other threads:[~2026-04-20 23:50 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-25 5:37 [PATCH kernel 0/9] PCI/TSM: coco/sev-guest: Implement SEV-TIO PCIe TDISP (phase2) Alexey Kardashevskiy
2026-02-25 5:37 ` [PATCH kernel 1/9] pci/tsm: Add TDISP report blob and helpers to parse it Alexey Kardashevskiy
2026-02-25 6:16 ` dan.j.williams
2026-02-25 10:10 ` Arnd Bergmann
2026-02-26 0:09 ` Alexey Kardashevskiy
2026-02-26 2:34 ` dan.j.williams
2026-02-26 3:49 ` Alexey Kardashevskiy
2026-02-26 21:08 ` dan.j.williams
2026-02-25 5:37 ` [PATCH kernel 2/9] pci/tsm: Add tsm_tdi_status Alexey Kardashevskiy
2026-02-25 6:33 ` dan.j.williams
2026-02-25 23:42 ` Alexey Kardashevskiy
2026-03-02 6:58 ` Aneesh Kumar K.V
2026-02-25 5:37 ` [PATCH kernel 3/9] coco/sev-guest: Allow multiple source files in the driver Alexey Kardashevskiy
2026-02-25 5:37 ` [PATCH kernel 4/9] dma/swiotlb: Stop forcing SWIOTLB for TDISP devices Alexey Kardashevskiy
2026-02-25 16:30 ` dan.j.williams
2026-02-25 18:00 ` Robin Murphy
2026-02-25 20:57 ` dan.j.williams
2026-02-28 0:28 ` Jason Gunthorpe
2026-03-02 23:53 ` dan.j.williams
2026-03-03 0:19 ` Jason Gunthorpe
2026-03-03 0:29 ` dan.j.williams
2026-03-03 12:43 ` Jason Gunthorpe
2026-03-04 6:45 ` Alexey Kardashevskiy
2026-03-04 12:43 ` Jason Gunthorpe
2026-03-25 10:42 ` Alexey Kardashevskiy
2026-04-03 12:40 ` Alexey Kardashevskiy
2026-04-15 6:32 ` Alexey Kardashevskiy
2026-04-20 23:50 ` Jason Gunthorpe [this message]
2026-04-30 3:25 ` Alexey Kardashevskiy
2026-02-25 16:48 ` Robin Murphy
2026-02-26 0:09 ` Alexey Kardashevskiy
2026-03-02 7:54 ` Aneesh Kumar K.V
2026-02-25 5:37 ` [PATCH kernel 5/9] x86/mm: Stop forcing decrypted page state " Alexey Kardashevskiy
2026-02-25 16:51 ` dan.j.williams
2026-02-25 5:37 ` [PATCH kernel 6/9] x86/dma-direct: Stop changing encrypted " Alexey Kardashevskiy
2026-02-25 17:08 ` Robin Murphy
2026-02-25 21:35 ` dan.j.williams
2026-02-26 6:22 ` Alexey Kardashevskiy
2026-02-28 0:06 ` Jason Gunthorpe
2026-03-02 0:01 ` Alexey Kardashevskiy
2026-03-02 0:35 ` Jason Gunthorpe
2026-03-02 5:26 ` Alexey Kardashevskiy
2026-03-02 13:35 ` Jason Gunthorpe
2026-03-03 8:19 ` Alexey Kardashevskiy
2026-03-03 12:15 ` Jason Gunthorpe
2026-02-25 5:37 ` [PATCH kernel 7/9] coco/sev-guest: Implement the guest support for SEV TIO (phase2) Alexey Kardashevskiy
2026-02-25 6:00 ` Borislav Petkov
2026-02-26 3:39 ` Alexey Kardashevskiy
2026-02-26 19:52 ` Borislav Petkov
2026-02-25 5:37 ` [PATCH kernel 8/9] RFC: PCI: Avoid needless touching of Command register Alexey Kardashevskiy
2026-02-26 0:24 ` Bjorn Helgaas
2026-02-26 5:58 ` Alexey Kardashevskiy
2026-02-26 0:34 ` dan.j.williams
2026-02-25 5:37 ` [PATCH kernel 9/9] pci: Allow encrypted MMIO mapping via sysfs Alexey Kardashevskiy
2026-03-02 8:20 ` Aneesh Kumar K.V
2026-03-02 8:59 ` Alexey Kardashevskiy
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