linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: agatti: Address Gunyah memory alignment needs

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Message-ID: <90264256-f53d-4a12-9b37-4cc43720c181@oss.qualcomm.com>
Date: Mon, 29 Dec 2025 13:43:18 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Sumit Garg <sumit.garg@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org
Cc: andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, akhilpo@....qualcomm.com,
        vikash.garodia@....qualcomm.com, dikshita.agarwal@....qualcomm.com,
        robin.clark@....qualcomm.com, lumag@...nel.org,
        linux-kernel@...r.kernel.org, Sumit Garg <sumit.garg@....qualcomm.com>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: agatti: Address Gunyah memory
 alignment needs

On 12/29/25 8:12 AM, Sumit Garg wrote:
> From: Sumit Garg <sumit.garg@....qualcomm.com>
> 
> Gunyah hypervisor requires it's memory start address to be 2MB aligned.
> So the address map for Agatti is updated to incorporate that requirement.
> This should be a backwards compatible DT change which should work with
> legacy QHEE based firmware stack too.
> 
> Signed-off-by: Sumit Garg <sumit.garg@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/agatti.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/agatti.dtsi b/arch/arm64/boot/dts/qcom/agatti.dtsi
> index e705eb24160a..153916980ac0 100644
> --- a/arch/arm64/boot/dts/qcom/agatti.dtsi
> +++ b/arch/arm64/boot/dts/qcom/agatti.dtsi
> @@ -298,8 +298,8 @@ reserved_memory: reserved-memory {
>  		#size-cells = <2>;
>  		ranges;
>  
> -		hyp_mem: hyp@...00000 {
> -			reg = <0x0 0x45700000 0x0 0x600000>;
> +		hyp_mem: hyp@...00000 {
> +			reg = <0x0 0x45600000 0x0 0x700000>;

On a second thought, please add a comment like:

/* Gunyah requires the start of the region to be 2MiB-aligned, QHEE doesn't care */

to prevent someone "fixing" it in the future

Konrad