linux-kernel - Re: [PATCH 3/6] remoteproc: qcom: Add helper function to support IOMMU devmem translation

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Message-ID: <6787fffa-642a-4099-ba00-445dd2b865ef@oss.qualcomm.com>
Date: Thu, 17 Oct 2024 23:25:00 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: neil.armstrong@...aro.org, Mukesh Ojha <quic_mojha@...cinc.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shiraz Hashim <quic_shashim@...cinc.com>
Subject: Re: [PATCH 3/6] remoteproc: qcom: Add helper function to support
 IOMMU devmem translation

On 10.10.2024 8:59 AM, neil.armstrong@...aro.org wrote:
> Hi,
> 
> On 07/10/2024 16:37, Mukesh Ojha wrote:
>> On Mon, Oct 07, 2024 at 10:08:16AM +0200, neil.armstrong@...aro.org wrote:
>>> On 04/10/2024 23:23, Mukesh Ojha wrote:
>>>> From: Shiraz Hashim <quic_shashim@...cinc.com>
>>>>
>>>> Qualcomm SoCs runnning with Qualcomm EL2 hypervisor(QHEE), IOMMU
>>>> translation set up for remote processors is managed by QHEE itself
>>>> however, for a case when these remote processors has to run under KVM
>>>
>>> This is not true, KVM is a Linux hypervisor, remote processors have
>>> nothing to do with KVM, please rephrase.
>>
>> Thanks, perhaps something like this,
>>
>> "However, when same SoC runs with KVM configuration, remoteproc IOMMU
>> translation needs to be set from Linux host running remoteproc PAS
>> driver"
> 
> Thanks but I still don't see what KVM has to do here, KVM is an an optional
> Linux kernel feature, Linux can be configured without KVM and still perfectly
> startup those remoteprocs.

Mukesh, KVM is a very specific use case. What you're referring to is
really "no QHEE / Gunyah". We can do s/KVM/Hyper-V (or almost any
other software running at EL2) and your claims still hold.

Konrad