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

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Message-ID: <2b368426-a572-4d3c-b991-9532fa828d23@linaro.org>
Date: Tue, 27 Aug 2024 08:35:33 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Jan Kiszka <jan.kiszka@...mens.com>, 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 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.

Best regards,
Krzysztof