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Date: Fri, 15 Oct 2021 17:28:41 +0300
From: "Paraschiv, Andra-Irina" <andraprs@...zon.com>
To: "Longpeng(Mike)" <longpeng2@...wei.com>
CC: <arei.gonglei@...wei.com>, <gregkh@...uxfoundation.org>,
<kamal@...onical.com>, <pbonzini@...hat.com>,
<sgarzare@...hat.com>, <stefanha@...hat.com>,
<vkuznets@...hat.com>, <linux-kernel@...r.kernel.org>,
<ne-devel-upstream@...zon.com>, <lexnv@...zon.com>,
<alcioa@...zon.com>
Subject: Re: [PATCH v3 4/4] nitro_enclaves: Add KUnit tests for contiguous
physical memory regions merging
On 09/10/2021 04:32, Longpeng(Mike) wrote:
> From: Longpeng <longpeng2@...wei.com>
>
> Add KUnit tests for the contiguous physical memory regions merging
> functionality from the Nitro Enclaves misc device logic.
>
> We'll see the following message using dmesg if everything goes well:
>
> [...] # Subtest: ne_misc_dev_test
> [...] 1..1
> [...] (NULL device *): Physical mem region address is not 2 MiB aligned
> [...] (NULL device *): Physical mem region size is not multiple of 2 MiB
> [...] (NULL device *): Physical mem region address is not 2 MiB aligned
> [...] ok 1 - ne_misc_dev_test_merge_phys_contig_memory_regions
> [...] ok 1 - ne_misc_dev_test
>
> Signed-off-by: Longpeng <longpeng2@...wei.com>
> ---
> Changes v2 -> v3:
> - update the commit title and commit message. [Andra]
> - align the fileds in 'struct phys_regions_test'. [Andra]
> - rename 'phys_regions_testcases' to 'phys_regions_test_cases'. [Andra]
> - add comments before each test cases. [Andra]
> - initialize the variables in ne_misc_dev_test_merge_phys_contig_memory_regions. [Andra]
> ---
> drivers/virt/nitro_enclaves/ne_misc_dev_test.c | 136 +++++++++++++++++++++++++
> 1 file changed, 136 insertions(+)
>
> diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev_test.c b/drivers/virt/nitro_enclaves/ne_misc_dev_test.c
> index bcb755e..7bd6b34 100644
> --- a/drivers/virt/nitro_enclaves/ne_misc_dev_test.c
> +++ b/drivers/virt/nitro_enclaves/ne_misc_dev_test.c
> @@ -2,7 +2,143 @@
>
> #include <kunit/test.h>
>
> +#define MAX_PHYS_REGIONS 16
> +#define INVALID_VALUE (~0ull)
> +
> +struct phys_regions_test {
> + u64 paddr;
> + u64 size;
> + int expect_rc;
> + int expect_num;
Please keep the same field type as "num": "unsigned long".
And just align the field names as mentioned in the first patch of the
series, so they are easily visualized.
> + u64 expect_last_paddr;
> + u64 expect_last_size;
> +} phys_regions_test_cases[] = {
> + /*
> + * Add the region from 0x1000 to (0x1000 + 0x200000 - 1):
> + * Expected result:
> + * Failed, start address is not 2M-aligned
> + *
> + * Now the instance of struct phys_contig_mem_regions is:
> + * num = 0
> + * region = {}
> + */
> + {0x1000, 0x200000, -EINVAL, 0, INVALID_VALUE, INVALID_VALUE},
> +
> + /*
> + * Add the region from 0x200000 to (0x200000 + 0x1000 - 1):
> + * Expected result:
> + * Failed, size is not 2M-aligned
> + *
> + * Now the instance of struct phys_contig_mem_regions is:
> + * num = 0
> + * region = {}
> + */
> + {0x200000, 0x1000, -EINVAL, 0, INVALID_VALUE, INVALID_VALUE},
> +
> + /*
> + * Add the region from 0x200000 to (0x200000 + 0x200000 - 1):
> + * Expected result:
> + * Successful
> + *
> + * Now the instance of struct phys_contig_mem_regions is:
> + * num = 1
> + * region = {
> + * {start=0x200000, end=0x3fffff}, // len=0x200000
> + * }
> + */
> + {0x200000, 0x200000, 0, 1, 0x200000, 0x200000},
> +
> + /*
> + * Add the region from 0x0 to (0x0 + 0x200000 - 1):
> + * Expected result:
> + * Successful
> + *
> + * Now the instance of struct phys_contig_mem_regions is:
> + * num = 2
> + * region = {
> + * {start=0x200000, end=0x3fffff}, // len=0x200000
> + * {start=0x0, end=0x1fffff}, // len=0x200000
> + * }
> + */
> + {0x0, 0x200000, 0, 2, 0x0, 0x200000},
> +
> + /*
> + * Add the region from 0x600000 to (0x600000 + 0x400000 - 1):
> + * Expected result:
> + * Successful
> + *
> + * Now the instance of struct phys_contig_mem_regions is:
> + * num = 3
> + * region = {
> + * {start=0x200000, end=0x3fffff}, // len=0x200000
> + * {start=0x0, end=0x1fffff}, // len=0x200000
> + * {start=0x600000, end=0x9fffff}, // len=0x400000
> + * }
> + */
> + {0x600000, 0x400000, 0, 3, 0x600000, 0x400000},
> +
> + /*
> + * Add the region from 0xa00000 to (0xa00000 + 0x400000 - 1):
> + * Expected result:
> + * Successful, merging case!
> + *
> + * Now the instance of struct phys_contig_mem_regions is:
> + * num = 3
> + * region = {
> + * {start=0x200000, end=0x3fffff}, // len=0x200000
> + * {start=0x0, end=0x1fffff}, // len=0x200000
> + * {start=0x600000, end=0xdfffff}, // len=0x800000
> + * }
> + */
> + {0xa00000, 0x400000, 0, 3, 0x600000, 0x800000},
> +
> + /*
> + * Add the region from 0x1000 to (0x1000 + 0x200000 - 1):
> + * Expected result:
> + * Failed, start address is not 2M-aligned
> + *
> + * Now the instance of struct phys_contig_mem_regions is:
> + * num = 3
> + * region = {
> + * {start=0x200000, end=0x3fffff}, // len=0x200000
> + * {start=0x0, end=0x1fffff}, // len=0x200000
> + * {start=0x600000, end=0xdfffff}, // len=0x800000
> + * }
> + */
> + {0x1000, 0x200000, -EINVAL, 3, 0x600000, 0x800000},
Nice, I like how the comments are structured.
Please also update from "region" to "regions" and "struct
phys_contig_mem_regions" to "ne_phys_contig_mem_regions", after the
suggested naming changes in the first patch of the series.
> +};
> +
> +static void ne_misc_dev_test_merge_phys_contig_memory_regions(struct kunit *test)
> +{
> + struct phys_contig_mem_regions *regions;
struct phys_contig_mem_regions *regions; => struct
ne_phys_contig_mem_regions phys_contig_mem_regions = {};
> + size_t sz = 0;
> + int rc = 0;
> + int i = 0;
> +
> + sz = sizeof(*regions) + MAX_PHYS_REGIONS * sizeof(struct range);
> + regions = kunit_kzalloc(test, sz, GFP_KERNEL);
And then can alloc the necessary memory for the "regions" field:
phys_contig_mem_regions.regions = kunit_kcalloc(test, MAX_PHYS_REGIONS,
sizeof(*phys_contig_mem_regions.regions), GFP_KERNEL);
> + KUNIT_ASSERT_TRUE(test, regions != NULL);
> +
> + for (i = 0; i < ARRAY_SIZE(phys_regions_test_cases); i++) {
> + struct phys_regions_test *entry = phys_regions_test_cases + i;
Could rename "entry" to "test_case".
Can also add:
unsigned long num = 0;
> +
> + rc = ne_merge_phys_contig_memory_regions(regions,
> + entry->paddr, entry->size);
And then can update it here and use it further on:
num = phys_contig_mem_regions.num;
> + KUNIT_EXPECT_EQ(test, rc, entry->expect_rc);
> + KUNIT_EXPECT_EQ(test, regions->num, entry->expect_num);
> +
> + if (entry->expect_last_paddr == INVALID_VALUE)
> + continue;
> +
> + KUNIT_EXPECT_EQ(test, regions->region[regions->num - 1].start,
> + entry->expect_last_paddr);
> + KUNIT_EXPECT_EQ(test, range_len(®ions->region[regions->num - 1]),
> + entry->expect_last_size);
> + }
At the end need to also free the allocated memory for the "regions"
field using "kunit_free" [1].
[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/kunit/test.h#n631
Thanks,
Andra
> +}
> +
> static struct kunit_case ne_misc_dev_test_cases[] = {
> + KUNIT_CASE(ne_misc_dev_test_merge_phys_contig_memory_regions),
> {}
> };
>
>
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