linux-kernel - Re: [PATCH v2 4/4] nitro_enclaves: add kunit tests for physical contiguous region merging

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Date:   Sun, 3 Oct 2021 17:14:24 +0300
From:   "Paraschiv, Andra-Irina" <andraprs@...zon.com>
To:     "Longpeng(Mike)" <longpeng2@...wei.com>
CC:     <linux-kernel@...r.kernel.org>, <arei.gonglei@...wei.com>,
        <gregkh@...uxfoundation.org>, <kamal@...onical.com>,
        <pbonzini@...hat.com>, <sgarzare@...hat.com>,
        <stefanha@...hat.com>, <vkuznets@...hat.com>,
        <ne-devel-upstream@...zon.com>, <lexnv@...zon.com>,
        <alcioa@...zon.com>
Subject: Re: [PATCH v2 4/4] nitro_enclaves: add kunit tests for physical
 contiguous region merging



On 21/09/2021 18:10, Longpeng(Mike) wrote:
> Add kunit tests for the physical contiguous memory region merging
> functionality.

nitro_enclaves: Add KUnit tests for contiguous physical memory regions 
merging

Add KUnit tests for the contiguous physical memory regions merging 
functionality from the Nitro Enclaves misc device logic.

> 
> Signed-off-by: Longpeng(Mike) <longpeng2@...wei.com>
> ---
>   drivers/virt/nitro_enclaves/ne_misc_test.c | 46 ++++++++++++++++++++++++++++++
>   1 file changed, 46 insertions(+)
> 
> diff --git a/drivers/virt/nitro_enclaves/ne_misc_test.c b/drivers/virt/nitro_enclaves/ne_misc_test.c
> index 3426c35..8532bec 100644
> --- a/drivers/virt/nitro_enclaves/ne_misc_test.c
> +++ b/drivers/virt/nitro_enclaves/ne_misc_test.c
> @@ -2,7 +2,53 @@
>   
>   #include <kunit/test.h>
>   
> +#define MAX_PHYS_REGIONS	16
> +
> +struct phys_regions_test {
> +	u64 paddr;
> +	u64 size;
> +	int expect_rc;
> +	unsigned long expect_num;
> +	u64 expect_last_paddr;
> +	u64 expect_last_size;

Please align the fields in the data structure so that's easier to 
visualize them.

u64              paddr;
u64              size;
int              expect_rc;
unsigned long    expect_num;
............

> +} phys_regions_testcases[] = {

phys_regions_test_cases

> +	{0x1000, 0x200000, -EINVAL, 0, ~0, ~0},
> +	{0x200000, 0x1000, -EINVAL, 0, ~0, ~0},
> +	{0x200000, 0x200000, 0, 1, 0x200000, 0x200000},
> +	{0x0, 0x200000, 0, 2, 0x0, 0x200000},
> +	{0x600000, 0x400000, 0, 3, 0x600000, 0x400000},
> +	{0xa00000, 0x400000, 0, 3, 0x600000, 0x800000},
> +	{0x1000, 0x200000, -EINVAL, 3, 0x600000, 0x800000},

Please add a comment before each of the above test cases, including a 
brief description of what each of them intends to test. So that it's 
easier to relate to the numbers.

> +};
> +
> +static void ne_misc_test_set_phys_region(struct kunit *test)

ne_misc_dev_test_merge_phys_contig_memory_regions

> +{
> +	struct phys_contig_mem_region *regions;
> +	size_t sz;
> +	int i, rc;

Please initialize the variables.

Thanks,
Andra

> +
> +	sz = sizeof(*regions) + MAX_PHYS_REGIONS * sizeof(struct phys_mem_region);
> +	regions = kunit_kzalloc(test, sz, GFP_KERNEL);
> +	KUNIT_ASSERT_TRUE(test, regions != NULL);
> +
> +	for (i = 0; i < ARRAY_SIZE(phys_regions_testcases); i++) {
> +		rc = ne_add_phys_memory_region(regions, phys_regions_testcases[i].paddr,
> +					       phys_regions_testcases[i].size);
> +		KUNIT_EXPECT_EQ(test, rc, phys_regions_testcases[i].expect_rc);
> +		KUNIT_EXPECT_EQ(test, regions->num, phys_regions_testcases[i].expect_num);
> +
> +		if (phys_regions_testcases[i].expect_last_paddr == ~0ul)
> +			continue;
> +
> +		KUNIT_EXPECT_EQ(test, regions->region[regions->num - 1].paddr,
> +				phys_regions_testcases[i].expect_last_paddr);
> +		KUNIT_EXPECT_EQ(test, regions->region[regions->num - 1].size,
> +				phys_regions_testcases[i].expect_last_size);
> +	}
> +}
> +
>   static struct kunit_case ne_misc_test_cases[] = {
> +	KUNIT_CASE(ne_misc_test_set_phys_region),
>   	{}
>   };
>   
> 



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