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linux/drivers/iommu/Kconfig
Mostafa Saleh 466ae6978a iommu: Add page_ext for IOMMU_DEBUG_PAGEALLOC 
Add a new config IOMMU_DEBUG_PAGEALLOC, which registers new data to
page_ext.

This config will be used by the IOMMU API to track pages mapped in
the IOMMU to catch drivers trying to free kernel memory that they
still map in their domains, causing all types of memory corruption.

This behaviour is disabled by default and can be enabled using
kernel cmdline iommu.debug_pagealloc.

Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2026-01-10 10:52:25 +01:00

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# SPDX-License-Identifier: GPL-2.0-only
# The IOVA library may also be used by non-IOMMU_API users
config IOMMU_IOVA
tristate
# IOMMU_API always gets selected by whoever wants it.
config IOMMU_API
bool
config IOMMUFD_DRIVER
bool
default n
menuconfig IOMMU_SUPPORT
bool "IOMMU Hardware Support"
depends on MMU
default y
help
Say Y here if you want to compile device drivers for IO Memory
Management Units into the kernel. These devices usually allow to
remap DMA requests and/or remap interrupts from other devices on the
system.
if IOMMU_SUPPORT
menu "Generic IOMMU Pagetable Support"
# Selected by the actual pagetable implementations
config IOMMU_IO_PGTABLE
bool
config IOMMU_IO_PGTABLE_LPAE
bool "ARMv7/v8 Long Descriptor Format"
select IOMMU_IO_PGTABLE
depends on ARM || ARM64 || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for cmpxchg64()
help
Enable support for the ARM long descriptor pagetable format.
This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
sizes at both stage-1 and stage-2, as well as address spaces
up to 48-bits in size.
config IOMMU_IO_PGTABLE_LPAE_KUNIT_TEST
tristate "KUnit tests for LPAE"
depends on IOMMU_IO_PGTABLE_LPAE && KUNIT
default KUNIT_ALL_TESTS
help
Enable kunit tests for LPAE page table allocator. This performs
a series of page-table consistency checks.
If unsure, say N here.
config IOMMU_IO_PGTABLE_ARMV7S
bool "ARMv7/v8 Short Descriptor Format"
select IOMMU_IO_PGTABLE
depends on ARM || ARM64 || COMPILE_TEST
help
Enable support for the ARM Short-descriptor pagetable format.
This supports 32-bit virtual and physical addresses mapped using
2-level tables with 4KB pages/1MB sections, and contiguous entries
for 64KB pages/16MB supersections if indicated by the IOMMU driver.
config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
bool "ARMv7s selftests"
depends on IOMMU_IO_PGTABLE_ARMV7S
help
Enable self-tests for ARMv7s page table allocator. This performs
a series of page-table consistency checks during boot.
If unsure, say N here.
config IOMMU_IO_PGTABLE_DART
bool "Apple DART Formats"
select IOMMU_IO_PGTABLE
depends on ARM64 || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for cmpxchg64()
help
Enable support for the Apple DART pagetable formats. These include
the t8020 and t6000/t8110 DART formats used in Apple M1/M2 family
SoCs.
If unsure, say N here.
endmenu
config IOMMU_DEBUGFS
bool "Export IOMMU internals in DebugFS"
depends on DEBUG_FS
help
Allows exposure of IOMMU device internals. This option enables
the use of debugfs by IOMMU drivers as required. Devices can,
at initialization time, cause the IOMMU code to create a top-level
debug/iommu directory, and then populate a subdirectory with
entries as required.
choice
prompt "IOMMU default domain type"
depends on IOMMU_API
default IOMMU_DEFAULT_DMA_LAZY if X86 || S390
default IOMMU_DEFAULT_DMA_STRICT
help
Choose the type of IOMMU domain used to manage DMA API usage by
device drivers. The options here typically represent different
levels of tradeoff between robustness/security and performance,
depending on the IOMMU driver. Not all IOMMUs support all options.
This choice can be overridden at boot via the command line, and for
some devices also at runtime via sysfs.
If unsure, keep the default.
config IOMMU_DEFAULT_DMA_STRICT
bool "Translated - Strict"
help
Trusted devices use translation to restrict their access to only
DMA-mapped pages, with strict TLB invalidation on unmap. Equivalent
to passing "iommu.passthrough=0 iommu.strict=1" on the command line.
Untrusted devices always use this mode, with an additional layer of
bounce-buffering such that they cannot gain access to any unrelated
data within a mapped page.
config IOMMU_DEFAULT_DMA_LAZY
bool "Translated - Lazy"
help
Trusted devices use translation to restrict their access to only
DMA-mapped pages, but with "lazy" batched TLB invalidation. This
mode allows higher performance with some IOMMUs due to reduced TLB
flushing, but at the cost of reduced isolation since devices may be
able to access memory for some time after it has been unmapped.
Equivalent to passing "iommu.passthrough=0 iommu.strict=0" on the
command line.
If this mode is not supported by the IOMMU driver, the effective
runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
config IOMMU_DEFAULT_PASSTHROUGH
bool "Passthrough"
help
Trusted devices are identity-mapped, giving them unrestricted access
to memory with minimal performance overhead. Equivalent to passing
"iommu.passthrough=1" (historically "iommu=pt") on the command line.
If this mode is not supported by the IOMMU driver, the effective
runtime default will fall back to IOMMU_DEFAULT_DMA_STRICT.
endchoice
config OF_IOMMU
def_bool y
depends on OF && IOMMU_API
# IOMMU-agnostic DMA-mapping layer
config IOMMU_DMA
def_bool ARM64 || X86 || S390
select DMA_OPS_HELPERS
select IOMMU_API
select IOMMU_IOVA
select NEED_SG_DMA_LENGTH
select NEED_SG_DMA_FLAGS if SWIOTLB
# Shared Virtual Addressing
config IOMMU_SVA
select IOMMU_MM_DATA
bool
config IOMMU_IOPF
bool
config FSL_PAMU
bool "Freescale IOMMU support"
depends on PCI
depends on PHYS_64BIT
depends on PPC_E500MC || (COMPILE_TEST && PPC)
select IOMMU_API
select GENERIC_ALLOCATOR
help
Freescale PAMU support. PAMU is the IOMMU present on Freescale QorIQ platforms.
PAMU can authorize memory access, remap the memory address, and remap I/O
transaction types.
# MSM IOMMU support
config MSM_IOMMU
bool "MSM IOMMU Support"
depends on ARM
depends on ARCH_QCOM || COMPILE_TEST
select IOMMU_API
select IOMMU_IO_PGTABLE_ARMV7S
help
Support for the IOMMUs found on certain Qualcomm SOCs.
These IOMMUs allow virtualization of the address space used by most
cores within the multimedia subsystem.
If unsure, say N here.
source "drivers/iommu/amd/Kconfig"
source "drivers/iommu/arm/Kconfig"
source "drivers/iommu/intel/Kconfig"
source "drivers/iommu/iommufd/Kconfig"
source "drivers/iommu/riscv/Kconfig"
config IRQ_REMAP
bool "Support for Interrupt Remapping"
depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI
select IRQ_MSI_LIB
help
Supports Interrupt remapping for IO-APIC and MSI devices.
To use x2apic mode in the CPU's which support x2APIC enhancements or
to support platforms with CPU's having > 8 bit APIC ID, say Y.
# OMAP IOMMU support
config OMAP_IOMMU
bool "OMAP IOMMU Support"
depends on ARCH_OMAP2PLUS || COMPILE_TEST
select IOMMU_API
help
The OMAP3 media platform drivers depend on iommu support,
if you need them say Y here.
config OMAP_IOMMU_DEBUG
bool "Export OMAP IOMMU internals in DebugFS"
depends on OMAP_IOMMU && DEBUG_FS
help
Select this to see extensive information about
the internal state of OMAP IOMMU in debugfs.
Say N unless you know you need this.
config ROCKCHIP_IOMMU
bool "Rockchip IOMMU Support"
depends on ARCH_ROCKCHIP || COMPILE_TEST
select IOMMU_API
select ARM_DMA_USE_IOMMU
help
Support for IOMMUs found on Rockchip rk32xx SOCs.
These IOMMUs allow virtualization of the address space used by most
cores within the multimedia subsystem.
Say Y here if you are using a Rockchip SoC that includes an IOMMU
device.
config SUN50I_IOMMU
bool "Allwinner H6 IOMMU Support"
depends on HAS_DMA
depends on ARCH_SUNXI || COMPILE_TEST
select ARM_DMA_USE_IOMMU
select IOMMU_API
help
Support for the IOMMU introduced in the Allwinner H6 SoCs.
config TEGRA_IOMMU_SMMU
bool "NVIDIA Tegra SMMU Support"
depends on ARCH_TEGRA || COMPILE_TEST
depends on TEGRA_AHB
depends on TEGRA_MC
select IOMMU_API
help
This driver supports the IOMMU hardware (SMMU) found on NVIDIA Tegra
SoCs (Tegra30 up to Tegra210).
config EXYNOS_IOMMU
bool "Exynos IOMMU Support"
depends on ARCH_EXYNOS || COMPILE_TEST
depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
select IOMMU_API
select ARM_DMA_USE_IOMMU
help
Support for the IOMMU (System MMU) of Samsung Exynos application
processor family. This enables H/W multimedia accelerators to see
non-linear physical memory chunks as linear memory in their
address space.
If unsure, say N here.
config EXYNOS_IOMMU_DEBUG
bool "Debugging log for Exynos IOMMU"
depends on EXYNOS_IOMMU
help
Select this to see the detailed log message that shows what
happens in the IOMMU driver.
Say N unless you need kernel log message for IOMMU debugging.
config IPMMU_VMSA
bool "Renesas VMSA-compatible IPMMU"
depends on ARCH_RENESAS || COMPILE_TEST
depends on ARM || ARM64 || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_LPAE
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
select ARM_DMA_USE_IOMMU
help
Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
APE6, R-Car Gen{2,3} and RZ/G{1,2} SoCs.
If unsure, say N.
config SPAPR_TCE_IOMMU
bool "sPAPR TCE IOMMU Support"
depends on PPC_POWERNV || PPC_PSERIES
select IOMMU_API
help
Enables bits of IOMMU API required by VFIO. The iommu_ops
is not implemented as it is not necessary for VFIO.
config APPLE_DART
tristate "Apple DART IOMMU Support"
depends on ARCH_APPLE || COMPILE_TEST
depends on !GENERIC_ATOMIC64 # for IOMMU_IO_PGTABLE_DART
select IOMMU_API
select IOMMU_IO_PGTABLE_DART
help
Support for Apple DART (Device Address Resolution Table) IOMMUs
found in Apple ARM SoCs like the M1.
This IOMMU is required for most peripherals using DMA to access
the main memory.
Say Y here if you are using an Apple SoC.
config S390_IOMMU
def_bool y if S390 && PCI
depends on S390 && PCI
select IOMMU_API
help
Support for the IOMMU API for s390 PCI devices.
config MTK_IOMMU
tristate "MediaTek IOMMU Support"
depends on ARCH_MEDIATEK || COMPILE_TEST
select ARM_DMA_USE_IOMMU
select IOMMU_API
select IOMMU_IO_PGTABLE_ARMV7S
select MEMORY
select MTK_SMI
help
Support for the M4U on certain Mediatek SOCs. M4U is MultiMedia
Memory Management Unit. This option enables remapping of DMA memory
accesses for the multimedia subsystem.
If unsure, say N here.
config MTK_IOMMU_V1
tristate "MediaTek IOMMU Version 1 (M4U gen1) Support"
depends on (ARCH_MEDIATEK && ARM) || COMPILE_TEST
select ARM_DMA_USE_IOMMU
select IOMMU_API
select MEMORY
select MTK_SMI
help
Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is
Multimedia Memory Managememt Unit. This option enables remapping of
DMA memory accesses for the multimedia subsystem.
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
depends on (ARM64 || X86)
select IOMMU_API
select INTERVAL_TREE
select ACPI_VIOT if ACPI
help
Para-virtualised IOMMU driver with virtio.
Say Y here if you intend to run this kernel as a guest.
config SPRD_IOMMU
tristate "Unisoc IOMMU Support"
depends on ARCH_SPRD || COMPILE_TEST
select IOMMU_API
help
Support for IOMMU on Unisoc's SoCs, this IOMMU can be used by
Unisoc's multimedia devices, such as display, Image codec(jpeg)
and a few signal processors, including VSP(video), GSP(graphic),
ISP(image), and CPP(camera pixel processor), etc.
Say Y here if you want to use the multimedia devices listed above.
config IOMMU_DEBUG_PAGEALLOC
bool "Debug IOMMU mappings against page allocations"
depends on DEBUG_PAGEALLOC && IOMMU_API && PAGE_EXTENSION
help
This enables a consistency check between the kernel page allocator and
the IOMMU subsystem. It verifies that pages being allocated or freed
are not currently mapped in any IOMMU domain.
This helps detect DMA use-after-free bugs where a driver frees a page
but forgets to unmap it from the IOMMU, potentially allowing a device
to overwrite memory that the kernel has repurposed.
These checks are best-effort and may not detect all problems.
Due to performance overhead, this feature is disabled by default.
You must enable "iommu.debug_pagealloc" from the kernel command
line to activate the runtime checks.
If unsure, say N.
endif # IOMMU_SUPPORT
source "drivers/iommu/generic_pt/Kconfig"
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