Extend the loopback test to a new mmap page.
Signed-off-by: Nicolin Chen nicolinc@nvidia.com --- drivers/iommu/iommufd/iommufd_test.h | 4 +++ tools/testing/selftests/iommu/iommufd_utils.h | 4 +++ drivers/iommu/iommufd/selftest.c | 33 ++++++++++++++++++- tools/testing/selftests/iommu/iommufd.c | 19 +++++++++++ 4 files changed, 59 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h index 51cd744a354f..8fc618b2bcf9 100644 --- a/drivers/iommu/iommufd/iommufd_test.h +++ b/drivers/iommu/iommufd/iommufd_test.h @@ -232,12 +232,16 @@ struct iommu_hwpt_invalidate_selftest { * (IOMMU_VIOMMU_TYPE_SELFTEST) * @in_data: Input random data from user space * @out_data: Output data (matching @in_data) to user space + * @out_mmap_offset: The offset argument for mmap syscall + * @out_mmap_length: The length argument for mmap syscall * * Simply set @out_data=@in_data for a loopback test */ struct iommu_viommu_selftest { __u32 in_data; __u32 out_data; + __aligned_u64 out_mmap_offset; + __aligned_u64 out_mmap_length; };
/* Should not be equal to any defined value in enum iommu_viommu_invalidate_data_type */ diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h index 9a556f99d992..4a1b2bade018 100644 --- a/tools/testing/selftests/iommu/iommufd_utils.h +++ b/tools/testing/selftests/iommu/iommufd_utils.h @@ -56,6 +56,10 @@ static unsigned long PAGE_SIZE; #define offsetofend(TYPE, MEMBER) \ (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
+#define test_err_mmap(_errno, length, offset) \ + EXPECT_ERRNO(_errno, (long)mmap(NULL, length, PROT_READ | PROT_WRITE, \ + MAP_SHARED, self->fd, offset)) + static inline void *memfd_mmap(size_t length, int prot, int flags, int *mfd_p) { int mfd_flags = (flags & MAP_HUGETLB) ? MFD_HUGETLB : 0; diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index 2189e9b119ee..8b2c44b32530 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -152,6 +152,9 @@ struct mock_viommu { struct mock_iommu_domain *s2_parent; struct mock_hw_queue *hw_queue[IOMMU_TEST_HW_QUEUE_MAX]; struct mutex queue_mutex; + + unsigned long mmap_offset; + u32 *page; /* Mmap page to test u32 type of in_data */ };
static inline struct mock_viommu *to_mock_viommu(struct iommufd_viommu *viommu) @@ -689,6 +692,10 @@ static void mock_viommu_destroy(struct iommufd_viommu *viommu)
if (refcount_dec_and_test(&mock_iommu->users)) complete(&mock_iommu->complete); + if (mock_viommu->mmap_offset) + iommufd_viommu_destroy_mmap(&mock_viommu->core, + mock_viommu->mmap_offset); + free_page((unsigned long)mock_viommu->page); mutex_destroy(&mock_viommu->queue_mutex);
/* iommufd core frees mock_viommu and viommu */ @@ -887,11 +894,28 @@ static int mock_viommu_init(struct iommufd_viommu *viommu, if (rc) return rc;
+ /* Allocate two pages */ + mock_viommu->page = + (u32 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1); + if (!mock_viommu->page) + return -ENOMEM; + + rc = iommufd_viommu_alloc_mmap(&mock_viommu->core, + __pa(mock_viommu->page), + PAGE_SIZE * 2, + &mock_viommu->mmap_offset); + if (rc) + goto err_free_page; + + /* For loopback tests on both the page and out_data */ + *mock_viommu->page = data.in_data; data.out_data = data.in_data; + data.out_mmap_length = PAGE_SIZE * 2; + data.out_mmap_offset = mock_viommu->mmap_offset; rc = iommu_copy_struct_to_user( user_data, &data, IOMMU_VIOMMU_TYPE_SELFTEST, out_data); if (rc) - return rc; + goto err_destroy_mmap; }
refcount_inc(&mock_iommu->users); @@ -900,6 +924,13 @@ static int mock_viommu_init(struct iommufd_viommu *viommu,
viommu->ops = &mock_viommu_ops; return 0; + +err_destroy_mmap: + iommufd_viommu_destroy_mmap(&mock_viommu->core, + mock_viommu->mmap_offset); +err_free_page: + free_page((unsigned long)mock_viommu->page); + return rc; }
static const struct iommu_ops mock_ops = { diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c index 6b88c250b505..8b85f6fc8cd0 100644 --- a/tools/testing/selftests/iommu/iommufd.c +++ b/tools/testing/selftests/iommu/iommufd.c @@ -2799,6 +2799,7 @@ TEST_F(iommufd_viommu, viommu_alloc_with_data) struct iommu_viommu_selftest data = { .in_data = 0xbeef, }; + uint32_t *test;
if (!self->device_id) SKIP(return, "Skipping test for variant no_viommu"); @@ -2807,6 +2808,24 @@ TEST_F(iommufd_viommu, viommu_alloc_with_data) IOMMU_VIOMMU_TYPE_SELFTEST, &data, sizeof(data), &self->viommu_id); ASSERT_EQ(data.out_data, data.in_data); + + /* Negative mmap tests -- offset and length cannot be changed */ + test_err_mmap(ENXIO, data.out_mmap_length, + data.out_mmap_offset + PAGE_SIZE); + test_err_mmap(ENXIO, data.out_mmap_length, + data.out_mmap_offset + PAGE_SIZE * 2); + test_err_mmap(ENXIO, data.out_mmap_length / 2, data.out_mmap_offset); + test_err_mmap(ENXIO, data.out_mmap_length * 2, data.out_mmap_offset); + + /* Now do a correct mmap for a loopback test */ + test = mmap(NULL, data.out_mmap_length, PROT_READ | PROT_WRITE, + MAP_SHARED, self->fd, data.out_mmap_offset); + ASSERT_NE(MAP_FAILED, test); + ASSERT_EQ(data.in_data, *test); + + /* The owner of the mmap region should be blocked */ + EXPECT_ERRNO(EBUSY, _test_ioctl_destroy(self->fd, self->viommu_id)); + munmap(test, data.out_mmap_length); }
TEST_F(iommufd_viommu, vdevice_alloc)