linux-kernel - [PATCH 1/5] arm64: dts: qcom: sc7180: Add EL2 overlay for WoA devices

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250501-sc-el2-overlays-v1-1-9202e59e3348@trvn.ru>
Date: Thu, 01 May 2025 22:03:41 +0500
From: Nikita Travkin <nikita@...n.ru>
To: 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>, cros-qcom-dts-watchers@...omium.org
Cc: Marc Zyngier <maz@...nel.org>, 
 Jens Glathe <jens.glathe@...schoolsolutions.biz>, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Nikita Travkin <nikita@...n.ru>
Subject: [PATCH 1/5] arm64: dts: qcom: sc7180: Add EL2 overlay for WoA
 devices

WoA devices using sc7180 use android firmware to boot, which notably
includes QHEE hypervisor. This means that, so far, Linux-based OS could
only boot in EL1 on those devices.

However Windows can replace QHEE upon boot with it's own hypervisor, and
with the use of tools such as "slbounce", it's possible to do the same
for Linux-based OS, in which case some modifications to the DT are
necessary to facilitate the absence of QHEE services.

Add a EL2-specific DT overlay and apply it to sc7180 WoA devices to
create -el2.dtb for each of them alongside "normal" dtb.

Signed-off-by: Nikita Travkin <nikita@...n.ru>
---
 arch/arm64/boot/dts/qcom/Makefile        |  3 ++-
 arch/arm64/boot/dts/qcom/sc7180-el2.dtso | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index adb4d026bcc4b24d73de92e204db8d525b0770e6..06da6f6791d69f56bafc3dad3e721c9ff2a1a68a 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -138,7 +138,8 @@ dtb-$(CONFIG_ARCH_QCOM)	+= sa8295p-adp.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sa8540p-ride.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sa8775p-ride.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sa8775p-ride-r3.dtb
-dtb-$(CONFIG_ARCH_QCOM)	+= sc7180-acer-aspire1.dtb
+sc7180-acer-aspire1-el2-dtbs	:= sc7180-acer-aspire1.dtb sc7180-el2.dtbo
+dtb-$(CONFIG_ARCH_QCOM)	+= sc7180-acer-aspire1.dtb sc7180-acer-aspire1-el2.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sc7180-idp.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sc7180-trogdor-coachz-r1.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sc7180-trogdor-coachz-r1-lte.dtb
diff --git a/arch/arm64/boot/dts/qcom/sc7180-el2.dtso b/arch/arm64/boot/dts/qcom/sc7180-el2.dtso
new file mode 100644
index 0000000000000000000000000000000000000000..49a98676ca4db270ecb55e8f801d0800ef9e4def
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/sc7180-el2.dtso
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+/*
+ * sc7180 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";
+	};
+};
+
+/* Venus can be used in EL2 if booted similarly to ChromeOS devices. */
+&venus {
+	video-firmware {
+		iommus = <&apps_smmu 0x0c42 0x0>;
+	};
+};

-- 
2.49.0