RE: [PATCH v4 4/4] nitro_enclaves: Add KUnit tests for contiguous physical memory regions merging

[Longpeng (Mike, Cloud Infrastructure Service Product Dept.)]

> -----Original Message-----
> From: Paraschiv, Andra-Irina [mailto:andraprs@xxxxxxxxxx]
> Sent: Sunday, November 7, 2021 9:20 PM
> To: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> <longpeng2@xxxxxxxxxx>
> Cc: Gonglei (Arei) <arei.gonglei@xxxxxxxxxx>; gregkh@xxxxxxxxxxxxxxxxxxx;
> kamal@xxxxxxxxxxxxx; pbonzini@xxxxxxxxxx; sgarzare@xxxxxxxxxx;
> stefanha@xxxxxxxxxx; vkuznets@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> ne-devel-upstream@xxxxxxxxxx; lexnv@xxxxxxxxxx; alcioa@xxxxxxxxxx
> Subject: Re: [PATCH v4 4/4] nitro_enclaves: Add KUnit tests for contiguous
> physical memory regions merging
> 
> 
> 
> On 03/11/2021 16:00, Longpeng(Mike) wrote:
> > From: Longpeng <longpeng2@xxxxxxxxxx>
> >
> > Add KUnit tests for the contiguous physical memory regions merging
> > functionality from the Nitro Enclaves misc device logic.
> >
> > We can build the test binary with the following configuration:
> >    CONFIG_KUNIT=y
> >    CONFIG_NITRO_ENCLAVES=m
> >    CONFIG_NITRO_ENCLAVES_MISC_DEV_TEST=y
> > and install the nitro_enclaves module to run the testcases.
> >
> > 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@xxxxxxxxxx>
> > ---
> > Changes v3 -> v4:
> >    - "int expect_num" -> "unsigned long  expect_num"  [Andra]
> >    - rename several variables and structures  [Andra]
> >    - invoke "kunit_kfree" to free the "regions"  [Andra]
> >
> > 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 | 139
> +++++++++++++++++++++++++
> >   1 file changed, 139 insertions(+)
> >
> > diff --git a/drivers/virt/nitro_enclaves/ne_misc_dev_test.c
> b/drivers/virt/nitro_enclaves/ne_misc_dev_test.c
> > index 6862e99..4648ec02 100644
> > --- a/drivers/virt/nitro_enclaves/ne_misc_dev_test.c
> > +++ b/drivers/virt/nitro_enclaves/ne_misc_dev_test.c
> > @@ -2,7 +2,146 @@
> >
> >   #include <kunit/test.h>
> >
> > +#define MAX_PHYS_REGIONS	16
> > +#define INVALID_VALUE		(~0ull)
> > +
> > +struct ne_phys_regions_test {
> > +	u64           paddr;
> > +	u64           size;
> > +	int           expect_rc;
> > +	unsigned long expect_num;
> > +	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 ne_phys_contig_mem_regions is:
> > +	 *   num = 0
> > +	 *   regions = {}
> > +	 */
> > +	{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 ne_phys_contig_mem_regions is:
> > +	 *   num = 0
> > +	 *   regions = {}
> > +	 */
> > +	{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 ne_phys_contig_mem_regions is:
> > +	 *   num = 1
> > +	 *   regions = {
> > +	 *       {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 ne_phys_contig_mem_regions is:
> > +	 *   num = 2
> > +	 *   regions = {
> > +	 *       {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 ne_phys_contig_mem_regions is:
> > +	 *   num = 3
> > +	 *   regions = {
> > +	 *       {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 ne_phys_contig_mem_regions is:
> > +	 *   num = 3
> > +	 *   regions = {
> > +	 *       {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 ne_phys_contig_mem_regions is:
> > +	 *   num = 3
> > +	 *   regions = {
> > +	 *       {start=0x200000, end=0x3fffff}, // len=0x200000
> > +	 *       {start=0x0,      end=0x1fffff}, // len=0x200000
> > +	 *       {start=0x600000, end=0xdfffff}, // len=0x800000
> > +	 *   }
> > +	 */
> > +	{0x1000, 0x200000, -EINVAL, 3, 0x600000, 0x800000},
> > +};
> > +
> > +static void ne_misc_dev_test_merge_phys_contig_memory_regions(struct kunit
> *test)
> > +{
> > +	struct ne_phys_contig_mem_regions phys_contig_mem_regions = {};
> > +	int rc = 0;
> > +	int i = 0;
> > +
> > +	phys_contig_mem_regions.regions = kunit_kcalloc(test, MAX_PHYS_REGIONS,
> > +					sizeof(*phys_contig_mem_regions.regions), GFP_KERNEL);
> > +	KUNIT_ASSERT_TRUE(test, phys_contig_mem_regions.regions != NULL);
> 
> Please update the codebase as per these two "checkpatch" messages:
> 
> CHECK: Alignment should match open parenthesis
> #118: FILE:
> /home/ubuntu/linux/drivers/virt/nitro_enclaves/ne_misc_dev_test.c:118:
> +	phys_contig_mem_regions.regions = kunit_kcalloc(test, MAX_PHYS_REGIONS,
> +					sizeof(*phys_contig_mem_regions.regions), GFP_KERNEL);
> 
> 
> CHECK: Comparison to NULL could be written "phys_contig_mem_regions.regions"
> #119: FILE:
> /home/ubuntu/linux/drivers/virt/nitro_enclaves/ne_misc_dev_test.c:119:
> +	KUNIT_ASSERT_TRUE(test, phys_contig_mem_regions.regions != NULL);
> 
> The first one is similar to the alignment check from the first patch in
> this series. The second one is just "KUNIT_ASSERT_TRUE(test,
> phys_contig_mem_regions.regions);".
> 

OK, will fix them (including the first patch) in the next version, Thanks.

> Other than that, looks good to me.
> 
> Thanks,
> Andra
> 
> > +
> > +	for (i = 0; i < ARRAY_SIZE(phys_regions_test_cases); i++) {
> > +		struct ne_phys_regions_test *test_case = &phys_regions_test_cases[i];
> > +		unsigned long num = 0;
> > +
> > +		rc = ne_merge_phys_contig_memory_regions(&phys_contig_mem_regions,
> > +							 test_case->paddr, test_case->size);
> > +		KUNIT_EXPECT_EQ(test, rc, test_case->expect_rc);
> > +		KUNIT_EXPECT_EQ(test, phys_contig_mem_regions.num,
> test_case->expect_num);
> > +
> > +		if (test_case->expect_last_paddr == INVALID_VALUE)
> > +			continue;
> > +
> > +		num = phys_contig_mem_regions.num;
> > +		KUNIT_EXPECT_EQ(test, phys_contig_mem_regions.regions[num - 1].start,
> > +				test_case->expect_last_paddr);
> > +		KUNIT_EXPECT_EQ(test, range_len(&phys_contig_mem_regions.regions[num
> - 1]),
> > +				test_case->expect_last_size);
> > +	}
> > +
> > +	kunit_kfree(test, phys_contig_mem_regions.regions);
> > +}
> > +
> >   static struct kunit_case ne_misc_dev_test_cases[] = {
> > +	KUNIT_CASE(ne_misc_dev_test_merge_phys_contig_memory_regions),
> >   	{}
> >   };
> >
> >
> 
> 
> 
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