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

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Message-ID: <aVtQHftDmENIAxrb@sumit-xelite>
Date: Mon, 5 Jan 2026 11:16:05 +0530
From: Sumit Garg <sumit.garg@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.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 Sat, Jan 03, 2026 at 09:49:04AM -0600, Bjorn Andersson wrote:
> On Mon, Dec 29, 2025 at 12:42:58PM +0530, 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.
> > 
> 
> How come this isn't conveyed to the operating system using the UEFI
> memory map?
> 

I agree that with EFI boot, the information is getting conveyed via EFI
memory map. But there will be non-EFI boot scenarios as well in case of
U-Boot. And moreover I suppose we need to keep the reserved memory
ranges in DT updated to reflect the actual memory map.

-Sumit