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gpu: nvgpu: unit test leaky failed mappings

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Ensure that when a mapping attempt fails in the middle of updating GMMU
PTEs, the PTEs are left unmapped. Add test_map_buffer_security() to the
VM tests to trigger a PD allocation failure and verify the first PTE.

Bug 200778663

Change-Id: I766c1a68b6f734a218c5c4a4f6a6655a7ad8ca27
Signed-off-by: Konsta Hölttä <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2599538
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Konsta Hölttä
2021-09-23 16:21:35 +03:00
committed by mobile promotions
parent 189ab6bd9a
commit 32a148867f
2 changed files with 183 additions and 1 deletions
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39
userspace/units/mm/vm/vm.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2019-2020, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2019-2021, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -245,6 +245,43 @@ int test_init_error_paths(struct unit_module *m, struct gk20a *g, void *__args);
int test_map_buffer_error_cases(struct unit_module *m, struct gk20a *g,
void *__args);
/**
* Test specification for: test_map_buffer_security
*
* Description: This negative test targets mapping security within the
* nvgpu_vm_map API.
*
* Test Type: Error injection, Security, Safety
*
* Targets: nvgpu_vm_init, nvgpu_vm_map, nvgpu_vm_put
*
* Input: None
*
* Steps:
* - Initialize a VM with the following characteristics:
* - 64KB large page support enabled
* - Low hole size = 64MB
* - Address space size = 128GB
* - Kernel reserved space size = 4GB
* - Obtain a buffer whose size would not fit in one set of PTEs that fit in
* the first allocated PD cache entry
* - Prepare a fixed mapping address at the same address as the buffer size
* - Check that a PTE that matches that virtual address is not valid to prepare
* for the check below.
* - Inject a memory allocation error at allocation 6 and ensure that
* nvgpu_vm_map reports a failure of type ENOMEM. This makes the allocation
* of the second PD cache entry to fail.
* - Check that a PTE that matches that virtual address is not valid. Because
* the PD allocation failed mid-update, the prior written entries must be
* undone.
* - Uninitialize the VM
*
* Output: Returns PASS if the steps above were executed successfully. FAIL
* otherwise.
*/
int test_map_buffer_security(struct unit_module *m, struct gk20a *g,
void *__args);
/**
* Test specification for: test_nvgpu_vm_alloc_va
*