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vfio: Type1 IOMMU implementation

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This VFIO IOMMU backend is designed primarily for AMD-Vi and Intel
VT-d hardware, but is potentially usable by anything supporting
similar mapping functionality.  We arbitrarily call this a Type1
backend for lack of a better name.  This backend has no IOVA
or host memory mapping restrictions for the user and is optimized
for relatively static mappings.  Mapped areas are pinned into system
memory.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson
2012-07-31 08:16:23 -06:00
parent 4a5b2a20ec
commit 73fa0d10d0
5 changed files with 821 additions and 1 deletions
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6
drivers/vfio/Kconfig
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@@ -1,6 +1,12 @@
config VFIO_IOMMU_TYPE1
tristate
depends on VFIO
default n
menuconfig VFIO
tristate "VFIO Non-Privileged userspace driver framework"
depends on IOMMU_API
select VFIO_IOMMU_TYPE1 if X86
help
VFIO provides a framework for secure userspace device drivers.
See Documentation/vfio.txt for more details.

2
drivers/vfio/Makefile
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@@ -1 +1,3 @@
obj-$(CONFIG_VFIO) += vfio.o
obj-$(CONFIG_VFIO_IOMMU_TYPE1) += vfio_iommu_type1.o
obj-$(CONFIG_VFIO_PCI) += pci/

7
drivers/vfio/vfio.c
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@@ -1376,6 +1376,13 @@ static int __init vfio_init(void)
pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
/*
* Attempt to load known iommu-drivers. This gives us a working
* environment without the user needing to explicitly load iommu
* drivers.
*/
request_module_nowait("vfio_iommu_type1");
return 0;
err_groups_cdev:

753
drivers/vfio/vfio_iommu_type1.c Normal file
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File diff suppressed because it is too large Load Diff

54
include/linux/vfio.h
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@@ -98,7 +98,7 @@ extern void vfio_unregister_iommu_driver(
/* Extensions */
/* None yet */
#define VFIO_TYPE1_IOMMU 1
/*
* The IOCTL interface is designed for extensibility by embedding the
@@ -364,4 +364,56 @@ struct vfio_irq_set {
*/
#define VFIO_DEVICE_RESET _IO(VFIO_TYPE, VFIO_BASE + 11)
/* -------- API for Type1 VFIO IOMMU -------- */
/**
* VFIO_IOMMU_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 12, struct vfio_iommu_info)
*
* Retrieve information about the IOMMU object. Fills in provided
* struct vfio_iommu_info. Caller sets argsz.
*
* XXX Should we do these by CHECK_EXTENSION too?
*/
struct vfio_iommu_type1_info {
__u32 argsz;
__u32 flags;
#define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info */
__u64 iova_pgsizes; /* Bitmap of supported page sizes */
};
#define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
/**
* VFIO_IOMMU_MAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 13, struct vfio_dma_map)
*
* Map process virtual addresses to IO virtual addresses using the
* provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required.
*/
struct vfio_iommu_type1_dma_map {
__u32 argsz;
__u32 flags;
#define VFIO_DMA_MAP_FLAG_READ (1 << 0) /* readable from device */
#define VFIO_DMA_MAP_FLAG_WRITE (1 << 1) /* writable from device */
__u64 vaddr; /* Process virtual address */
__u64 iova; /* IO virtual address */
__u64 size; /* Size of mapping (bytes) */
};
#define VFIO_IOMMU_MAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 13)
/**
* VFIO_IOMMU_UNMAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 14, struct vfio_dma_unmap)
*
* Unmap IO virtual addresses using the provided struct vfio_dma_unmap.
* Caller sets argsz.
*/
struct vfio_iommu_type1_dma_unmap {
__u32 argsz;
__u32 flags;
__u64 iova; /* IO virtual address */
__u64 size; /* Size of mapping (bytes) */
};
#define VFIO_IOMMU_UNMAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 14)
#endif /* VFIO_H */