linux-kernel - Re: [PATCH 0/5] soc: ti: Add and use PVU on K3-AM65 for DMA isolation

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Message-ID: <bac7e1fb-83d0-40de-b789-0a4e469a0b64@siemens.com>
Date: Tue, 27 Aug 2024 11:22:57 +0200
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Nishanth Menon <nm@...com>, Santosh Shilimkar <ssantosh@...nel.org>,
 Vignesh Raghavendra <vigneshr@...com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, Siddharth Vadapalli <s-vadapalli@...com>,
 Bao Cheng Su <baocheng.su@...mens.com>, Hua Qian Li
 <huaqian.li@...mens.com>, Diogo Ivo <diogo.ivo@...mens.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Krzysztof Wilczyński
 <kw@...ux.com>, linux-pci@...r.kernel.org,
 Lorenzo Pieralisi <lpieralisi@...nel.org>
Subject: Re: [PATCH 0/5] soc: ti: Add and use PVU on K3-AM65 for DMA isolation

On 27.08.24 08:35, Krzysztof Kozlowski wrote:
> On 26/08/2024 21:25, Jan Kiszka wrote:
>> On 26.08.24 20:53, Krzysztof Kozlowski wrote:
>>> On 26/08/2024 19:56, Jan Kiszka wrote:
>>>> Only few of the K3 SoCs have an IOMMU and, thus, can isolate the system
>>>> against DMA-based attacks of external PCI devices. The AM65 is without
>>>> an IOMMU, but it comes with something close to it: the Peripheral
>>>> Virtualization Unit (PVU).
>>>>
>>>> The PVU was originally designed to establish static compartments via a
>>>> hypervisor, isolate those DMA-wise against each other and the host and
>>>> even allow remapping of guest-physical addresses. But it only provides
>>>> a static translation region, not page-granular mappings. Thus, it cannot
>>>> be handled transparently like an IOMMU.
>>>
>>> You keep developing on some old kernel. I noticed it on few patchsets
>>> last days. Please work on mainline.
>>>
>>
>> How did you come to this conclusion? This patch set was written for
>> mainline, just rebased and tested again over next-20240826 before
>> sending today.
> 
> You send it to addresses you CANNOT get from mainline kernel. There is
> no way mainline kernel get_maintainers.pl produces them.
> 

That is likely due to that I didn't re-run the get_maintainers.pl for
all areas of changes but rather reused an address list from a slightly
older posting, sorry.

IOW, your assumption is still not correct when it comes to code.

Jan

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