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drm/gpusvm: Reject VMAs with VM_IO or VM_PFNMAP when creating SVM ranges

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VMAs marked with VM_IO or VM_PFNMAP are not backed by struct page
objects, which GPUSVM requires in order to operate correctly. In
particular, get_pages() relies on hmm_range_fault() to resolve struct
pages for the target range.

Attempting to create an SVM range on such VMAs results in repeated
get_pages() failures and can lead to an infinite loop inside a driver’s
page‑fault handler. Prevent this by rejecting ranges on VM_IO or
VM_PFNMAP VMAs and returning -EIO.

Fixes: 99624bdff8 ("drm/gpusvm: Add support for GPU Shared Virtual Memory")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patch.msgid.link/20260325231608.25581-1-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2026-03-25 16:16:08 -07:00
parent 896070686b
commit b82a225e57
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/drm_gpusvm.c
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@ -1065,6 +1065,11 @@ drm_gpusvm_range_find_or_insert(struct drm_gpusvm *gpusvm,
goto err_notifier_remove;
}
if (vas->vm_flags & (VM_IO | VM_PFNMAP)) {
err = -EIO;
goto err_notifier_remove;
}
range = drm_gpusvm_range_find(notifier, fault_addr, fault_addr + 1);
if (range)
goto out_mmunlock;