linux-kernel - [RFC PATCH 12/34] gunyah: Add hypervisor driver

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Message-Id: <20250424141341.841734-13-karim.manaouil@linaro.org>
Date: Thu, 24 Apr 2025 15:13:19 +0100
From: Karim Manaouil <karim.manaouil@...aro.org>
To: linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev
Cc: Karim Manaouil <karim.manaouil@...aro.org>,
	Alexander Graf <graf@...zon.com>,
	Alex Elder <elder@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Fuad Tabba <tabba@...gle.com>,
	Joey Gouly <joey.gouly@....com>,
	Jonathan Corbet <corbet@....net>,
	Marc Zyngier <maz@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
	Quentin Perret <qperret@...gle.com>,
	Rob Herring <robh@...nel.org>,
	Srinivas Kandagatla <srini@...nel.org>,
	Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
	Will Deacon <will@...nel.org>,
	Haripranesh S <haripran@....qualcomm.com>,
	Carl van Schaik <cvanscha@....qualcomm.com>,
	Murali Nalajala <mnalajal@...cinc.com>,
	Sreenivasulu Chalamcharla <sreeniva@....qualcomm.com>,
	Trilok Soni <tsoni@...cinc.com>,
	Stefan Schmidt <stefan.schmidt@...aro.org>,
	Elliot Berman <quic_eberman@...cinc.com>
Subject: [RFC PATCH 12/34] gunyah: Add hypervisor driver

From: Elliot Berman <quic_eberman@...cinc.com>

Add driver to detect when running under Gunyah. It performs basic
identification hypercall and populates the platform bus for resource
manager to probe.

Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
Reviewed-by: Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>
Signed-off-by: Karim Manaouil <karim.manaouil@...aro.org>
---
 drivers/virt/Makefile        |  1 +
 drivers/virt/gunyah/Makefile |  3 +++
 drivers/virt/gunyah/gunyah.c | 52 ++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+)
 create mode 100644 drivers/virt/gunyah/Makefile
 create mode 100644 drivers/virt/gunyah/gunyah.c

diff --git a/drivers/virt/Makefile b/drivers/virt/Makefile
index f29901bd7820..ef6a3835d078 100644
--- a/drivers/virt/Makefile
+++ b/drivers/virt/Makefile
@@ -10,3 +10,4 @@ obj-y				+= vboxguest/
 obj-$(CONFIG_NITRO_ENCLAVES)	+= nitro_enclaves/
 obj-$(CONFIG_ACRN_HSM)		+= acrn/
 obj-y				+= coco/
+obj-y				+= gunyah/
diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
new file mode 100644
index 000000000000..34f32110faf9
--- /dev/null
+++ b/drivers/virt/gunyah/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_GUNYAH) += gunyah.o
diff --git a/drivers/virt/gunyah/gunyah.c b/drivers/virt/gunyah/gunyah.c
new file mode 100644
index 000000000000..3e795e3ba881
--- /dev/null
+++ b/drivers/virt/gunyah/gunyah.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/gunyah.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+static int gunyah_probe(struct platform_device *pdev)
+{
+	struct gunyah_hypercall_hyp_identify_resp gunyah_api;
+
+	if (!arch_is_gunyah_guest())
+		return -ENODEV;
+
+	gunyah_hypercall_hyp_identify(&gunyah_api);
+
+	pr_info("Running under Gunyah hypervisor %llx/v%u\n",
+		FIELD_GET(GUNYAH_API_INFO_VARIANT_MASK, gunyah_api.api_info),
+		gunyah_api_version(&gunyah_api));
+
+	/* Might move this out to individual drivers if there's ever an API version bump */
+	if (gunyah_api_version(&gunyah_api) != GUNYAH_API_V1) {
+		pr_info("Unsupported Gunyah version: %u\n",
+			gunyah_api_version(&gunyah_api));
+		return -ENODEV;
+	}
+
+	return devm_of_platform_populate(&pdev->dev);
+}
+
+static const struct of_device_id gunyah_of_match[] = {
+	{ .compatible = "qcom,gunyah-hypervisor" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, gunyah_of_match);
+
+/* clang-format off */
+static struct platform_driver gunyah_driver = {
+	.probe = gunyah_probe,
+	.driver = {
+		.name = "gunyah",
+		.of_match_table = gunyah_of_match,
+	}
+};
+/* clang-format on */
+module_platform_driver(gunyah_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Gunyah Driver");
-- 
2.39.5