linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: monaco: Add EL2 overlay

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Message-ID: <2bc58f2f-5879-45bc-a169-fd6771faa21c@oss.qualcomm.com>
Date: Fri, 23 Jan 2026 12:29:03 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Mukesh Ojha <mukesh.ojha@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: monaco: Add EL2 overlay

On 1/23/26 11:35 AM, Mukesh Ojha wrote:
> All the Monaco IOT variants boards are using Gunyah hypervisor which
> means that, so far, Linux-based OS could only boot in EL1 on those
> devices.  However, it is possible for us to boot Linux at EL2 on these
> devices [1].
> 
> When running under Gunyah, the remote processor firmware IOMMU streams
> are controlled by Gunyah. However, without Gunyah, the IOMMU is managed
> by the consumer of this DeviceTree. Therefore, describe the firmware
> streams for each remote processor.
> 
> Add a EL2-specific DT overlay and apply it to Monaco IOT variant
> devices to create -el2.dtb for each of them alongside "normal" dtb.
> 
> [1]
> https://docs.qualcomm.com/bundle/publicresource/topics/80-70020-4/boot-developer-touchpoints.html#uefi
> 
> Signed-off-by: Mukesh Ojha <mukesh.ojha@....qualcomm.com>
> ---

[...]

> +++ b/arch/arm64/boot/dts/qcom/monaco-el2.dtso
> @@ -0,0 +1,32 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> + */
> +
> +/*
> + * Monaco specific modifications required to boot in EL2.
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +/* We can't and don't need to use zap shader in EL2 as linux can zap the gpu on it's own. */
> +&gpu_zap_shader {
> +	status = "disabled";
> +};
> +
> +&iris {
> +	status = "disabled";
> +};
> +
> +&remoteproc_gpdsp {
> +	iommus = <&apps_smmu 0x28a0 0x0>;
> +};
> +
> +&remoteproc_adsp {
> +	iommus = <&apps_smmu 0x2000 0x0>;
> +};
> +
> +&remoteproc_cdsp {
> +	iommus = <&apps_smmu 0x19c0 0x0400>;
> +};

The iommus values look OK

Please sort the label references

Konrad