linux-kernel - [RFC v1 2/5] iommu: Move Hyper-V IOMMU driver to its own subdirectory

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Message-ID: <20251209051128.76913-3-zhangyu1@linux.microsoft.com>
Date: Tue,  9 Dec 2025 13:11:25 +0800
From: Yu Zhang <zhangyu1@...ux.microsoft.com>
To: linux-kernel@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	iommu@...ts.linux.dev,
	linux-pci@...r.kernel.org
Cc: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	lpieralisi@...nel.org,
	kwilczynski@...nel.org,
	mani@...nel.org,
	robh@...nel.org,
	bhelgaas@...gle.com,
	arnd@...db.de,
	joro@...tes.org,
	will@...nel.org,
	robin.murphy@....com,
	easwar.hariharan@...ux.microsoft.com,
	jacob.pan@...ux.microsoft.com,
	nunodasneves@...ux.microsoft.com,
	mrathor@...ux.microsoft.com,
	mhklinux@...look.com,
	peterz@...radead.org,
	linux-arch@...r.kernel.org
Subject: [RFC v1 2/5] iommu: Move Hyper-V IOMMU driver to its own subdirectory

From: Easwar Hariharan <eahariha@...ux.microsoft.com>

The Hyper-V IOMMU driver currently only supports IRQ remapping.
As it will be adding DMA remapping support, prepare a directory
to contain all the different feature files.

This is a simple rename commit and has no functional changes.

Signed-off-by: Easwar Hariharan <eahariha@...ux.microsoft.com>
Signed-off-by: Yu Zhang <zhangyu1@...ux.microsoft.com>
---
 drivers/iommu/Kconfig                                  | 10 +---------
 drivers/iommu/Makefile                                 |  2 +-
 drivers/iommu/hyperv/Kconfig                           | 10 ++++++++++
 drivers/iommu/hyperv/Makefile                          |  2 ++
 .../iommu/{hyperv-iommu.c => hyperv/irq_remapping.c}   |  2 +-
 5 files changed, 15 insertions(+), 11 deletions(-)
 create mode 100644 drivers/iommu/hyperv/Kconfig
 create mode 100644 drivers/iommu/hyperv/Makefile
 rename drivers/iommu/{hyperv-iommu.c => hyperv/irq_remapping.c} (99%)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index c9ae3221cd6f..661ff4e764cc 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -194,6 +194,7 @@ config MSM_IOMMU
 source "drivers/iommu/amd/Kconfig"
 source "drivers/iommu/arm/Kconfig"
 source "drivers/iommu/intel/Kconfig"
+source "drivers/iommu/hyperv/Kconfig"
 source "drivers/iommu/iommufd/Kconfig"
 source "drivers/iommu/riscv/Kconfig"
 
@@ -350,15 +351,6 @@ config MTK_IOMMU_V1
 
 	  if unsure, say N here.
 
-config HYPERV_IOMMU
-	bool "Hyper-V IRQ Handling"
-	depends on HYPERV && X86
-	select IOMMU_API
-	default HYPERV
-	help
-	  Stub IOMMU driver to handle IRQs to support Hyper-V Linux
-	  guest and root partitions.
-
 config VIRTIO_IOMMU
 	tristate "Virtio IOMMU driver"
 	depends on VIRTIO
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index b17ef9818759..757dc377cb66 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_AMD_IOMMU) += amd/
 obj-$(CONFIG_INTEL_IOMMU) += intel/
 obj-$(CONFIG_RISCV_IOMMU) += riscv/
 obj-$(CONFIG_GENERIC_PT) += generic_pt/fmt/
+obj-$(CONFIG_HYPERV_IOMMU) += hyperv/
 obj-$(CONFIG_IOMMU_API) += iommu.o
 obj-$(CONFIG_IOMMU_SUPPORT) += iommu-pages.o
 obj-$(CONFIG_IOMMU_API) += iommu-traces.o
@@ -29,7 +30,6 @@ obj-$(CONFIG_TEGRA_IOMMU_SMMU) += tegra-smmu.o
 obj-$(CONFIG_EXYNOS_IOMMU) += exynos-iommu.o
 obj-$(CONFIG_FSL_PAMU) += fsl_pamu.o fsl_pamu_domain.o
 obj-$(CONFIG_S390_IOMMU) += s390-iommu.o
-obj-$(CONFIG_HYPERV_IOMMU) += hyperv-iommu.o
 obj-$(CONFIG_VIRTIO_IOMMU) += virtio-iommu.o
 obj-$(CONFIG_IOMMU_SVA) += iommu-sva.o
 obj-$(CONFIG_IOMMU_IOPF) += io-pgfault.o
diff --git a/drivers/iommu/hyperv/Kconfig b/drivers/iommu/hyperv/Kconfig
new file mode 100644
index 000000000000..30f40d867036
--- /dev/null
+++ b/drivers/iommu/hyperv/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# HyperV paravirtualized IOMMU support
+config HYPERV_IOMMU
+	bool "Hyper-V IRQ Handling"
+	depends on HYPERV && X86
+	select IOMMU_API
+	default HYPERV
+	help
+	  Stub IOMMU driver to handle IRQs to support Hyper-V Linux
+	  guest and root partitions.
diff --git a/drivers/iommu/hyperv/Makefile b/drivers/iommu/hyperv/Makefile
new file mode 100644
index 000000000000..9f557bad94ff
--- /dev/null
+++ b/drivers/iommu/hyperv/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_HYPERV_IOMMU) += irq_remapping.o
diff --git a/drivers/iommu/hyperv-iommu.c b/drivers/iommu/hyperv/irq_remapping.c
similarity index 99%
rename from drivers/iommu/hyperv-iommu.c
rename to drivers/iommu/hyperv/irq_remapping.c
index 0961ac805944..f2c4c7d67302 100644
--- a/drivers/iommu/hyperv-iommu.c
+++ b/drivers/iommu/hyperv/irq_remapping.c
@@ -22,7 +22,7 @@
 #include <asm/hypervisor.h>
 #include <asm/mshyperv.h>
 
-#include "irq_remapping.h"
+#include "../irq_remapping.h"
 
 #ifdef CONFIG_IRQ_REMAP
 
-- 
2.49.0