linux-kernel - [PATCH v4 15/28] iommu/arm-smmu-v3: Load the driver later in KVM mode

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Message-ID: <20250819215156.2494305-16-smostafa@google.com>
Date: Tue, 19 Aug 2025 21:51:43 +0000
From: Mostafa Saleh <smostafa@...gle.com>
To: linux-kernel@...r.kernel.org, kvmarm@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev
Cc: maz@...nel.org, oliver.upton@...ux.dev, joey.gouly@....com, 
	suzuki.poulose@....com, yuzenghui@...wei.com, catalin.marinas@....com, 
	will@...nel.org, robin.murphy@....com, jean-philippe@...aro.org, 
	qperret@...gle.com, tabba@...gle.com, jgg@...pe.ca, mark.rutland@....com, 
	praan@...gle.com, Mostafa Saleh <smostafa@...gle.com>
Subject: [PATCH v4 15/28] iommu/arm-smmu-v3: Load the driver later in KVM mode

While in KVM mode, the driver must be loaded after the hypervisor
initializes.

Signed-off-by: Mostafa Saleh <smostafa@...gle.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 25 ++++++++++++++++-----
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 10ca07c6dbe9..a04730b5fe41 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -4576,12 +4576,6 @@ static const struct of_device_id arm_smmu_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, arm_smmu_of_match);
 
-static void arm_smmu_driver_unregister(struct platform_driver *drv)
-{
-	arm_smmu_sva_notifier_synchronize();
-	platform_driver_unregister(drv);
-}
-
 static struct platform_driver arm_smmu_driver = {
 	.driver	= {
 		.name			= "arm-smmu-v3",
@@ -4592,8 +4586,27 @@ static struct platform_driver arm_smmu_driver = {
 	.remove = arm_smmu_device_remove,
 	.shutdown = arm_smmu_device_shutdown,
 };
+
+#ifndef CONFIG_ARM_SMMU_V3_PKVM
+static void arm_smmu_driver_unregister(struct platform_driver *drv)
+{
+	arm_smmu_sva_notifier_synchronize();
+	platform_driver_unregister(drv);
+}
+
 module_driver(arm_smmu_driver, platform_driver_register,
 	      arm_smmu_driver_unregister);
+#else
+/*
+ * Must be done after the hypervisor initializes at module_init()
+ * No need for unregister as this is a built in driver.
+ */
+static int arm_smmu_driver_register(void)
+{
+	return platform_driver_register(&arm_smmu_driver);
+}
+device_initcall_sync(arm_smmu_driver_register);
+#endif /* !CONFIG_ARM_SMMU_V3_PKVM */
 
 MODULE_DESCRIPTION("IOMMU API for ARM architected SMMUv3 implementations");
 MODULE_AUTHOR("Will Deacon <will@...nel.org>");
-- 
2.51.0.rc1.167.g924127e9c0-goog