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f4b20bb34c
Provide a mock kernel module for the iommu_domain that allows it to run without any HW and the mocking provides a way to directly validate that the PFNs loaded into the iommu_domain are correct. This exposes the access kAPI toward userspace to allow userspace to explore the functionality of pages.c and io_pagetable.c The mock also simulates the rare case of PAGE_SIZE > iommu page size as the mock will operate at a 2K iommu page size. This allows exercising all of the calculations to support this mismatch. This is also intended to support syzkaller exploring the same space. However, it is an unusually invasive config option to enable all of this. The config option should not be enabled in a production kernel. Link: https://lore.kernel.org/r/16-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com Tested-by: Matthew Rosato <mjrosato@linux.ibm.com> # s390 Tested-by: Eric Auger <eric.auger@redhat.com> # aarch64 Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
93 lines
1.7 KiB
C
93 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES.
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*/
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#ifndef _UAPI_IOMMUFD_TEST_H
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#define _UAPI_IOMMUFD_TEST_H
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#include <linux/types.h>
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#include <linux/iommufd.h>
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enum {
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IOMMU_TEST_OP_ADD_RESERVED = 1,
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IOMMU_TEST_OP_MOCK_DOMAIN,
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IOMMU_TEST_OP_MD_CHECK_MAP,
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IOMMU_TEST_OP_MD_CHECK_REFS,
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IOMMU_TEST_OP_CREATE_ACCESS,
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IOMMU_TEST_OP_DESTROY_ACCESS_PAGES,
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IOMMU_TEST_OP_ACCESS_PAGES,
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IOMMU_TEST_OP_ACCESS_RW,
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IOMMU_TEST_OP_SET_TEMP_MEMORY_LIMIT,
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};
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enum {
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MOCK_APERTURE_START = 1UL << 24,
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MOCK_APERTURE_LAST = (1UL << 31) - 1,
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};
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enum {
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MOCK_FLAGS_ACCESS_WRITE = 1 << 0,
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MOCK_FLAGS_ACCESS_SYZ = 1 << 16,
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};
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enum {
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MOCK_ACCESS_RW_WRITE = 1 << 0,
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MOCK_ACCESS_RW_SLOW_PATH = 1 << 2,
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};
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enum {
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MOCK_FLAGS_ACCESS_CREATE_NEEDS_PIN_PAGES = 1 << 0,
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};
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struct iommu_test_cmd {
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__u32 size;
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__u32 op;
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__u32 id;
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__u32 __reserved;
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union {
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struct {
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__aligned_u64 start;
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__aligned_u64 length;
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} add_reserved;
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struct {
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__u32 out_device_id;
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__u32 out_hwpt_id;
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} mock_domain;
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struct {
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__aligned_u64 iova;
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__aligned_u64 length;
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__aligned_u64 uptr;
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} check_map;
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struct {
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__aligned_u64 length;
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__aligned_u64 uptr;
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__u32 refs;
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} check_refs;
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struct {
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__u32 out_access_fd;
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__u32 flags;
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} create_access;
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struct {
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__u32 access_pages_id;
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} destroy_access_pages;
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struct {
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__u32 flags;
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__u32 out_access_pages_id;
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__aligned_u64 iova;
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__aligned_u64 length;
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__aligned_u64 uptr;
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} access_pages;
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struct {
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__aligned_u64 iova;
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__aligned_u64 length;
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__aligned_u64 uptr;
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__u32 flags;
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} access_rw;
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struct {
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__u32 limit;
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} memory_limit;
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};
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__u32 last;
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};
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#define IOMMU_TEST_CMD _IO(IOMMUFD_TYPE, IOMMUFD_CMD_BASE + 32)
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#endif
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