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vfio: selftests: fix map limit tests to use last available iova

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Use the newly available vfio_pci_iova_ranges() to determine the last
legal IOVA, and use this as the basis for vfio_dma_map_limit_test tests.

Fixes: de8d1f2fd5 ("vfio: selftests: add end of address space DMA map/unmap tests")
Reviewed-by: David Matlack <dmatlack@google.com>
Tested-by: David Matlack <dmatlack@google.com>
Signed-off-by: Alex Mastro <amastro@fb.com>
Link: https://lore.kernel.org/r/20251111-iova-ranges-v3-2-7960244642c5@fb.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
This commit is contained in:
Alex Mastro 2025-11-11 10:48:25 -08:00 committed by Alex Williamson
parent 7c44656ab3
commit a77fa0b922
1 changed files with 13 additions and 2 deletions
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15
tools/testing/selftests/vfio/vfio_dma_mapping_test.c
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@ -3,6 +3,8 @@
#include <sys/mman.h>
#include <unistd.h>
#include <uapi/linux/types.h>
#include <linux/iommufd.h>
#include <linux/limits.h>
#include <linux/mman.h>
#include <linux/sizes.h>
@ -219,7 +221,10 @@ FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES();
FIXTURE_SETUP(vfio_dma_map_limit_test)
{
struct vfio_dma_region *region = &self->region;
struct iommu_iova_range *ranges;
u64 region_size = getpagesize();
iova_t last_iova;
u32 nranges;
/*
* Over-allocate mmap by double the size to provide enough backing vaddr
@ -232,8 +237,13 @@ FIXTURE_SETUP(vfio_dma_map_limit_test)
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
ASSERT_NE(region->vaddr, MAP_FAILED);
/* One page prior to the end of address space */
region->iova = ~(iova_t)0 & ~(region_size - 1);
ranges = vfio_pci_iova_ranges(self->device, &nranges);
VFIO_ASSERT_NOT_NULL(ranges);
last_iova = ranges[nranges - 1].last;
free(ranges);
/* One page prior to the last iova */
region->iova = last_iova & ~(region_size - 1);
region->size = region_size;
}
@ -276,6 +286,7 @@ TEST_F(vfio_dma_map_limit_test, overflow)
struct vfio_dma_region *region = &self->region;
int rc;
region->iova = ~(iova_t)0 & ~(region->size - 1);
region->size = self->mmap_size;
rc = __vfio_pci_dma_map(self->device, region);