linux-kernel - [RFC PATCH 34/34] KVM: gunyah: enable KVM for Gunyah

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Message-Id: <20250424141341.841734-35-karim.manaouil@linaro.org>
Date: Thu, 24 Apr 2025 15:13:41 +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>
Subject: [RFC PATCH 34/34] KVM: gunyah: enable KVM for Gunyah

Enable KVM to act as the interface to create and manage Qualcomm's
Gunyah-based virtual machines [1].

[1] https://www.qualcomm.com/developer/blog/2024/08/learn-about-gunyah--qualcomm-s-open-source--lightweight-hypervis

Signed-off-by: Karim Manaouil <karim.manaouil@...aro.org>
---
 arch/arm64/kvm/gunyah.c      | 12 ++++++++++++
 drivers/virt/gunyah/gunyah.c |  3 +++
 include/linux/gunyah.h       |  1 +
 3 files changed, 16 insertions(+)

diff --git a/arch/arm64/kvm/gunyah.c b/arch/arm64/kvm/gunyah.c
index 23b9128bf5b1..91f0260ef3f5 100644
--- a/arch/arm64/kvm/gunyah.c
+++ b/arch/arm64/kvm/gunyah.c
@@ -2071,3 +2071,15 @@ void kvm_arch_free_vm(struct kvm *kvm)
 
 	kfree(ghvm);
 }
+
+int kvm_gunyah_init(void)
+{
+	int err;
+
+	err = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+	if (err)
+		return err;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_gunyah_init);
diff --git a/drivers/virt/gunyah/gunyah.c b/drivers/virt/gunyah/gunyah.c
index 3e795e3ba881..629c812fbac0 100644
--- a/drivers/virt/gunyah/gunyah.c
+++ b/drivers/virt/gunyah/gunyah.c
@@ -28,6 +28,9 @@ static int gunyah_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	if (!kvm_gunyah_init())
+		pr_info("KVM for Gunyah is available!\n");
+
 	return devm_of_platform_populate(&pdev->dev);
 }
 
diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
index 26fdfa3174da..7d43449c4547 100644
--- a/include/linux/gunyah.h
+++ b/include/linux/gunyah.h
@@ -421,4 +421,5 @@ enum gunyah_error
 gunyah_hypercall_vcpu_run(u64 capid, unsigned long *resume_data,
 			  struct gunyah_hypercall_vcpu_run_resp *resp);
 
+int kvm_gunyah_init(void);
 #endif
-- 
2.39.5