linux-kernel - Re: [PATCH] perf test: Skip watchpoint tests if no watchpoints available

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1671ea30-cc2f-e3b3-d8d0-430e6e14fed6@linux.ibm.com>
Date:   Wed, 23 Nov 2022 13:35:34 +0530
From:   kajoljain <kjain@...ux.ibm.com>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Disha Goel <disgoel@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] perf test: Skip watchpoint tests if no watchpoints
 available



On 11/21/22 15:57, Naveen N. Rao wrote:
> On IBM Power9, perf watchpoint tests fail since no hardware breakpoints
> are available. Detect this by checking the error returned by
> perf_event_open() and skip the tests in that case.
> 
> Reported-by: Disha Goel <disgoel@...ux.vnet.ibm.com>
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> ---

Patch looks fine to me. Also tested it in power9 box

Test result without this patch changes :
 23: Watchpoint  :
 23.1: Read Only Watchpoint    : FAILED!
 23.2: Write Only Watchpoint   : FAILED!
 23.3: Read / Write Watchpoint : FAILED!
 23.4: Modify Watchpoint       : FAILED!


Test result with patch changes:
 23: Watchpoint  :
 23.1: Read Only Watchpoint    : Skip (missing hardware support)
 23.2: Write Only Watchpoint   : Skip (missing hardware support)
 23.3: Read / Write Watchpoint : Skip (missing hardware support)
 23.4: Modify Watchpoint       : Skip (missing hardware support)


Reviewed-by: Kajol Jain<kjain@...ux.ibm.com>
Tested-by: Kajol Jain<kjain@...ux.ibm.com>

Thanks,
Kajol Jain

>  tools/perf/tests/wp.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/tools/perf/tests/wp.c b/tools/perf/tests/wp.c
> index 56455da30341b4..cc8719609b19ea 100644
> --- a/tools/perf/tests/wp.c
> +++ b/tools/perf/tests/wp.c
> @@ -59,8 +59,10 @@ static int __event(int wp_type, void *wp_addr, unsigned long wp_len)
>  	get__perf_event_attr(&attr, wp_type, wp_addr, wp_len);
>  	fd = sys_perf_event_open(&attr, 0, -1, -1,
>  				 perf_event_open_cloexec_flag());
> -	if (fd < 0)
> +	if (fd < 0) {
> +		fd = -errno;
>  		pr_debug("failed opening event %x\n", attr.bp_type);
> +	}
>  
>  	return fd;
>  }
> @@ -77,7 +79,7 @@ static int test__wp_ro(struct test_suite *test __maybe_unused,
>  
>  	fd = __event(HW_BREAKPOINT_R, (void *)&data1, sizeof(data1));
>  	if (fd < 0)
> -		return -1;
> +		return fd == -ENODEV ? TEST_SKIP : -1;
>  
>  	tmp = data1;
>  	WP_TEST_ASSERT_VAL(fd, "RO watchpoint", 1);
> @@ -101,7 +103,7 @@ static int test__wp_wo(struct test_suite *test __maybe_unused,
>  
>  	fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
>  	if (fd < 0)
> -		return -1;
> +		return fd == -ENODEV ? TEST_SKIP : -1;
>  
>  	tmp = data1;
>  	WP_TEST_ASSERT_VAL(fd, "WO watchpoint", 0);
> @@ -126,7 +128,7 @@ static int test__wp_rw(struct test_suite *test __maybe_unused,
>  	fd = __event(HW_BREAKPOINT_R | HW_BREAKPOINT_W, (void *)&data1,
>  		     sizeof(data1));
>  	if (fd < 0)
> -		return -1;
> +		return fd == -ENODEV ? TEST_SKIP : -1;
>  
>  	tmp = data1;
>  	WP_TEST_ASSERT_VAL(fd, "RW watchpoint", 1);
> @@ -150,7 +152,7 @@ static int test__wp_modify(struct test_suite *test __maybe_unused, int subtest _
>  
>  	fd = __event(HW_BREAKPOINT_W, (void *)&data1, sizeof(data1));
>  	if (fd < 0)
> -		return -1;
> +		return fd == -ENODEV ? TEST_SKIP : -1;
>  
>  	data1 = tmp;
>  	WP_TEST_ASSERT_VAL(fd, "Modify watchpoint", 1);
> 
> base-commit: 63a3bf5e8d9e79ce456c8f73d4395a5a51d841b1