April 2024 - Linux-kselftest-mirror

[PATCH] selftests/vDSO: Fix assignment in condition without parentheses

by Edward Liaw

Fixes clang compiler warnings by adding parentheses: parse_vdso.c:65:9: warning: using the result of an assignment as a condition without parentheses [-Wparentheses] if (g = h & 0xf0000000) ~~^~~~~~~~~~~~~~~~ parse_vdso.c:65:9: note: place parentheses around the assignment to silence this warning if (g = h & 0xf0000000) ^ ( ) parse_vdso.c:65:9: note: use '==' to turn this assignment into an equality comparison if (g = h & 0xf0000000) ^ == Fixes: 98eedc3a9dbf ("Document the vDSO and add a reference parser") Signed-off-by: Edward Liaw <edliaw(a)google.com> --- tools/testing/selftests/vDSO/parse_vdso.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c index 413f75620a35..b9cf771006da 100644 --- a/tools/testing/selftests/vDSO/parse_vdso.c +++ b/tools/testing/selftests/vDSO/parse_vdso.c @@ -62,7 +62,7 @@ static unsigned long elf_hash(const unsigned char *name) while (*name) { h = (h << 4) + *name++; - if (g = h & 0xf0000000) + if ((g = h & 0xf0000000)) h ^= g >> 24; h &= ~g; } -- 2.44.0.769.g3c40516874-goog

12 months

2
1
0 0

[PATCH bpf-next 0/2] Free strdup memory in selftests

by Geliang Tang

From: Geliang Tang <tanggeliang(a)kylinos.cn> Two fixes to free strdup memory in selftests to avoid memory leaks. Geliang Tang (2): selftests/bpf: Free strdup memory in test_sockmap selftests/bpf: Free strdup memory in veristat tools/testing/selftests/bpf/test_sockmap.c | 10 ++++++++-- tools/testing/selftests/bpf/veristat.c | 5 ++++- 2 files changed, 12 insertions(+), 3 deletions(-) -- 2.40.1

12 months

4
7
0 0

[PATCH V3] KVM: selftests: Add a new option to rseq_test

by Zide Chen

Currently, the migration worker delays 1-10 us, assuming that one KVM_RUN iteration only takes a few microseconds. But if the CPU low power wakeup latency is large enough, for example, hundreds or even thousands of microseconds deep C-state exit latencies on x86 server CPUs, it may happen that it's not able to wakeup the target CPU before the migration worker starts to migrate the vCPU thread to the next CPU. If the system workload is light, most CPUs could be at a certain low power state, which may result in less successful migrations and fail the migration/KVM_RUN ratio sanity check. But this is not supposed to be deemed a test failure. This patch adds a command line option to skip the sanity check in this case. Signed-off-by: Zide Chen <zide.chen(a)intel.com> Signed-off-by: donsheng <dongsheng.x.zhang(a)intel.com> V2: - removed the busy loop implementation - add the new "-s" option V3: - drop the usleep randomization code - removed the term C-state for less confusion for non-x86 archetectures - changed subject --- tools/testing/selftests/kvm/rseq_test.c | 40 +++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/rseq_test.c b/tools/testing/selftests/kvm/rseq_test.c index 28f97fb52044..1daac3f51447 100644 --- a/tools/testing/selftests/kvm/rseq_test.c +++ b/tools/testing/selftests/kvm/rseq_test.c @@ -186,12 +186,35 @@ static void calc_min_max_cpu(void) "Only one usable CPU, task migration not possible"); } +static void help(const char *name) +{ + puts(""); + printf("usage: %s [-h] [-s]\n", name); + printf(" -s: skip the sanity check for successful KVM_RUN.\n"); + puts(""); + exit(0); +} + int main(int argc, char *argv[]) { int r, i, snapshot; struct kvm_vm *vm; struct kvm_vcpu *vcpu; u32 cpu, rseq_cpu; + bool skip_sanity_check = false; + int opt; + + while ((opt = getopt(argc, argv, "sh")) != -1) { + switch (opt) { + case 's': + skip_sanity_check = true; + break; + case 'h': + default: + help(argv[0]); + break; + } + } r = sched_getaffinity(0, sizeof(possible_mask), &possible_mask); TEST_ASSERT(!r, "sched_getaffinity failed, errno = %d (%s)", errno, @@ -254,9 +277,22 @@ int main(int argc, char *argv[]) * getcpu() to stabilize. A 2:1 migration:KVM_RUN ratio is a fairly * conservative ratio on x86-64, which can do _more_ KVM_RUNs than * migrations given the 1us+ delay in the migration task. + * + * Another reason why it may have small migration:KVM_RUN ratio is that, + * on systems with large low power mode wakeup latency, it may happen + * quite often that the scheduler is not able to wake up the target CPU + * before the vCPU thread is scheduled to another CPU. */ - TEST_ASSERT(i > (NR_TASK_MIGRATIONS / 2), - "Only performed %d KVM_RUNs, task stalled too much?", i); + TEST_ASSERT(skip_sanity_check || i > (NR_TASK_MIGRATIONS / 1), + "Only performed %d KVM_RUNs, task stalled too much? \n" + " Try to run it with -s option, or disable deep sleep " + "states in the system,\n" + " e.g., boot the host with cpuidle.off=1 or other driver " + "specific kernel options,\n" + " or do it through the PM QoS interface at runtime: \n" + " cat > /dev/cpu_dma_latency <(echo -e -n " + "\"\\x0\\x0\\x0\\x0\"; sleep inf) &\n" + " PID=$! && run_the_test && kill $PID" , i); pthread_join(migration_thread, NULL); -- 2.34.1

12 months

3
2
0 0

[PATCH v2] selftests/vDSO: Explicit unsigned char conversion for elf_hash

by Edward Liaw

Fixes clang compilation warnings by adding explicit unsigned conversion: parse_vdso.c:206:22: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign] ver_hash = elf_hash(version); ^~~~~~~ parse_vdso.c:59:52: note: passing argument to parameter 'name' here static unsigned long elf_hash(const unsigned char *name) ^ parse_vdso.c:207:46: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign] ELF(Word) chain = vdso_info.bucket[elf_hash(name) % vdso_info.nbucket]; ^~~~ parse_vdso.c:59:52: note: passing argument to parameter 'name' here static unsigned long elf_hash(const unsigned char *name) Fixes: 98eedc3a9dbf ("Document the vDSO and add a reference parser") Signed-off-by: Edward Liaw <edliaw(a)google.com> --- v2: update commit message with correct compiler warning --- tools/testing/selftests/vDSO/parse_vdso.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c index 413f75620a35..7e2ea9bea394 100644 --- a/tools/testing/selftests/vDSO/parse_vdso.c +++ b/tools/testing/selftests/vDSO/parse_vdso.c @@ -203,8 +203,8 @@ void *vdso_sym(const char *version, const char *name) if (!vdso_info.valid) return 0; - ver_hash = elf_hash(version); - ELF(Word) chain = vdso_info.bucket[elf_hash(name) % vdso_info.nbucket]; + ver_hash = elf_hash((const unsigned char *)version); + ELF(Word) chain = vdso_info.bucket[elf_hash((const unsigned char *)name) % vdso_info.nbucket]; for (; chain != STN_UNDEF; chain = vdso_info.chain[chain]) { ELF(Sym) *sym = &vdso_info.symtab[chain]; -- 2.44.0.769.g3c40516874-goog

12 months

1
0
0 0

[PATCH] KVM: selftests: Make monitor_mwait require MONITOR/MWAIT feature

by Zide Chen

If this feature is not supported or is disabled by IA32_MISC_ENABLE on the host, executing MONITOR or MWAIT instruction from the guest doesn't cause monitor/mwait VM exits, but a #UD. So, we need to skip this test if CPUID.01H:ECX[3] is cleared. Signed-off-by: Zide Chen <zide.chen(a)intel.com> --- tools/testing/selftests/kvm/x86_64/monitor_mwait_test.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/kvm/x86_64/monitor_mwait_test.c b/tools/testing/selftests/kvm/x86_64/monitor_mwait_test.c index 853802641e1e..cdbfcf7cac5c 100644 --- a/tools/testing/selftests/kvm/x86_64/monitor_mwait_test.c +++ b/tools/testing/selftests/kvm/x86_64/monitor_mwait_test.c @@ -75,6 +75,7 @@ int main(int argc, char *argv[]) struct ucall uc; int testcase; + TEST_REQUIRE(this_cpu_has(X86_FEATURE_MWAIT)); TEST_REQUIRE(kvm_has_cap(KVM_CAP_DISABLE_QUIRKS2)); vm = vm_create_with_one_vcpu(&vcpu, guest_code); -- 2.34.1

12 months

2
1
0 0

[PATCH] KVM: selftests: Avoid assuming "sudo" exists

by Brendan Jackman

I ran into a failure running this test on a minimal rootfs. Can be fixed by just skipping the "sudo" in case we are already root. Signed-off-by: Brendan Jackman <jackmanb(a)google.com> --- tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh b/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh index 7cbb409801eea..0e56822e8e0bf 100755 --- a/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh +++ b/tools/testing/selftests/kvm/x86_64/nx_huge_pages_test.sh @@ -13,10 +13,21 @@ NX_HUGE_PAGES_RECOVERY_RATIO=$(cat /sys/module/kvm/parameters/nx_huge_pages_reco NX_HUGE_PAGES_RECOVERY_PERIOD=$(cat /sys/module/kvm/parameters/nx_huge_pages_recovery_period_ms) HUGE_PAGES=$(cat /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages) +# If we're already root, the host might not have sudo. +if [ $(whoami) == "root" ]; then + function maybe_sudo () { + "$@" + } +else + function maybe_sudo () { + sudo "$@" + } +fi + set +e function sudo_echo () { - echo "$1" | sudo tee -a "$2" > /dev/null + echo "$1" | maybe_sudo tee -a "$2" > /dev/null } NXECUTABLE="$(dirname $0)/nx_huge_pages_test" --- base-commit: 2c71fdf02a95b3dd425b42f28fd47fb2b1d22702 change-id: 20240415-kvm-selftests-no-sudo-1a55f831f882 Best regards, -- Brendan Jackman <jackmanb(a)google.com>

12 months

3
4
0 0

[PATCH][next] KVM: selftests: Remove second semicolon

by Colin Ian King

There is a statement with two semicolons. Remove the second one, it is redundant. Signed-off-by: Colin Ian King <colin.i.king(a)gmail.com> --- tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c index d2ea0435f4f7..7d707d8068a4 100644 --- a/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c +++ b/tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c @@ -125,7 +125,7 @@ struct compat_vcpu_runstate_info { uint32_t state; uint64_t state_entry_time; uint64_t time[5]; -} __attribute__((__packed__));; +} __attribute__((__packed__)); struct arch_vcpu_info { unsigned long cr2; -- 2.39.2

12 months

2
1
0 0

[PATCH] selftests/vDSO: Explicit unsigned char conversion for elf_hash

by Edward Liaw

Fixes clang compilation warnings by adding explicit unsigned conversion: parse_vdso.c:206:22: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign] ver_hash = elf_hash((const char *)version); ^~~~~~~~~~~~~~~~~~~~~ parse_vdso.c:59:52: note: passing argument to parameter 'name' here static unsigned long elf_hash(const unsigned char *name) ^ parse_vdso.c:207:46: warning: passing 'const char *' to parameter of type 'const unsigned char *' converts between pointers to integer types where one is of the unique plain 'char' type and the other is not [-Wpointer-sign] ELF(Word) chain = vdso_info.bucket[elf_hash((const char *)name) % vdso_info.nbucket]; ^~~~~~~~~~~~~~~~~~ parse_vdso.c:59:52: note: passing argument to parameter 'name' here static unsigned long elf_hash(const unsigned char *name) Fixes: 98eedc3a9dbf ("Document the vDSO and add a reference parser") Signed-off-by: Edward Liaw <edliaw(a)google.com> --- tools/testing/selftests/vDSO/parse_vdso.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c index 413f75620a35..7e2ea9bea394 100644 --- a/tools/testing/selftests/vDSO/parse_vdso.c +++ b/tools/testing/selftests/vDSO/parse_vdso.c @@ -203,8 +203,8 @@ void *vdso_sym(const char *version, const char *name) if (!vdso_info.valid) return 0; - ver_hash = elf_hash(version); - ELF(Word) chain = vdso_info.bucket[elf_hash(name) % vdso_info.nbucket]; + ver_hash = elf_hash((const unsigned char *)version); + ELF(Word) chain = vdso_info.bucket[elf_hash((const unsigned char *)name) % vdso_info.nbucket]; for (; chain != STN_UNDEF; chain = vdso_info.chain[chain]) { ELF(Sym) *sym = &vdso_info.symtab[chain]; -- 2.44.0.769.g3c40516874-goog

12 months

1
0
0 0

[PATCH bpf-next v5 0/2] Add F_SETFL for fcntl in test_sockmap

by Geliang Tang

From: Geliang Tang <tanggeliang(a)kylinos.cn> v5: - add a new patch "Check recv lengths in test_sockmap" instead of using "continue" in msg_loop. v4: - address Martin's comments for v3. (thanks.) - add Yonghong's "Acked-by" tags. (thanks.) - update subject-prefix from "bpf-next" to "bpf". Patch 1, v3 of "selftests/bpf: Add F_SETFL for fcntl": - detect nonblock flag automaticly, then test_sockmap can run in both block and nonblock modes. - use continue instead of again in v2. Patch 2, fix for umount cgroup2 error. Geliang Tang (2): selftests/bpf: Check recv lengths in test_sockmap selftests/bpf: Add F_SETFL for fcntl in test_sockmap tools/testing/selftests/bpf/test_sockmap.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) -- 2.40.1

12 months

2
3
0 0

[PATCH v2 0/5] Fix Kselftest's vfork() side effects

by Mickaël Salaün

Hi, As reported by Kernel Test Robot [1], some pidfd tests fail. This is due to the use of vfork() which introduced some side effects. Similarly, while making it more generic, a previous commit made some Landlock file system tests flaky, and subject to the host's file system mount configuration. This series fixes all these side effects by replacing vfork() with clone3() and CLONE_VFORK, which is cleaner (no arbitrary shared memory) and makes the Kselftest framework more robust. I tried different approaches and I found this one to be the cleaner and less invasive for current test cases. This second series split the latest patch into 5 patches. I successfully ran the following tests (using TEST_F and fork/clone/clone3) with this series: - landlock:fs_test - landlock:net_test - landlock:ptrace_test - move_mount_set_group:move_mount_set_group_test - net/af_unix:scm_pidfd - perf_events:remove_on_exec - pidfd:pidfd_getfd_test - pidfd:pidfd_setns_test - seccomp:seccomp_bpf - user_events:abi_test [1] https://lore.kernel.org/oe-lkp/202403291015.1fcfa957-oliver.sang@intel.com Previous version: v1: https://lore.kernel.org/r/20240426172252.1862930-1-mic@digikod.net Regards, Mickaël Salaün (9): selftests/pidfd: Fix config for pidfd_setns_test selftests/landlock: Fix FS tests when run on a private mount point selftests/harness: Fix fixture teardown selftests/harness: Fix interleaved scheduling leading to race conditions selftests/landlock: Do not allocate memory in fixture data selftests/harness: Constify fixture variants selftests/pidfd: Fix wrong expectation selftests/harness: Share _metadata between forked processes selftests/harness: Fix vfork() side effects tools/testing/selftests/kselftest_harness.h | 113 +++++++++++++----- tools/testing/selftests/landlock/fs_test.c | 83 ++++++++----- tools/testing/selftests/pidfd/config | 2 + .../selftests/pidfd/pidfd_setns_test.c | 2 +- 4 files changed, 135 insertions(+), 65 deletions(-) base-commit: e67572cd2204894179d89bd7b984072f19313b03 -- 2.44.0

12 months

3
17
0 0

2025

2024

2023

2022

2021

2020

2019

2018

2017

Linux-kselftest-mirror April 2024