May 2021 - Linux-kselftest-mirror

[PATCH][RESEND] selftests: splice: Adjust for handler fallback removal

by Kees Cook

Some pseudo-filesystems do not have an explicit splice fops since adding commit 36e2c7421f02 ("fs: don't allow splice read/write without explicit ops"), and now will reject attempts to use splice() in those filesystem paths. Reported-by: kernel test robot <rong.a.chen(a)intel.com> Link: https://lore.kernel.org/lkml/202009181443.C2179FB@keescook/ Fixes: 36e2c7421f02 ("fs: don't allow splice read/write without explicit ops") Cc: Christoph Hellwig <hch(a)lst.de> Cc: Shuah Khan <shuah(a)kernel.org> Cc: linux-kselftest(a)vger.kernel.org Signed-off-by: Kees Cook <keescook(a)chromium.org> --- Resend of https://lore.kernel.org/linux-kselftest/20201005204517.2652730-1-keescook@c… --- .../selftests/splice/short_splice_read.sh | 119 ++++++++++++++---- 1 file changed, 98 insertions(+), 21 deletions(-) diff --git a/tools/testing/selftests/splice/short_splice_read.sh b/tools/testing/selftests/splice/short_splice_read.sh index 7810d3589d9a..22b6c8910b18 100755 --- a/tools/testing/selftests/splice/short_splice_read.sh +++ b/tools/testing/selftests/splice/short_splice_read.sh @@ -1,21 +1,87 @@ #!/bin/sh # SPDX-License-Identifier: GPL-2.0 +# +# Test for mishandling of splice() on pseudofilesystems, which should catch +# bugs like 11990a5bd7e5 ("module: Correctly truncate sysfs sections output") +# +# Since splice fallback was removed as part of the set_fs() rework, many of these +# tests expect to fail now. See https://lore.kernel.org/lkml/202009181443.C2179FB@keescook/ set -e +DIR=$(dirname "$0") + ret=0 +expect_success() +{ + title="$1" + shift + + echo "" >&2 + echo "$title ..." >&2 + + set +e + "$@" + rc=$? + set -e + + case "$rc" in + 0) + echo "ok: $title succeeded" >&2 + ;; + 1) + echo "FAIL: $title should work" >&2 + ret=$(( ret + 1 )) + ;; + *) + echo "FAIL: something else went wrong" >&2 + ret=$(( ret + 1 )) + ;; + esac +} + +expect_failure() +{ + title="$1" + shift + + echo "" >&2 + echo "$title ..." >&2 + + set +e + "$@" + rc=$? + set -e + + case "$rc" in + 0) + echo "FAIL: $title unexpectedly worked" >&2 + ret=$(( ret + 1 )) + ;; + 1) + echo "ok: $title correctly failed" >&2 + ;; + *) + echo "FAIL: something else went wrong" >&2 + ret=$(( ret + 1 )) + ;; + esac +} + do_splice() { filename="$1" bytes="$2" expected="$3" + report="$4" - out=$(./splice_read "$filename" "$bytes" | cat) + out=$("$DIR"/splice_read "$filename" "$bytes" | cat) if [ "$out" = "$expected" ] ; then - echo "ok: $filename $bytes" + echo " matched $report" >&2 + return 0 else - echo "FAIL: $filename $bytes" - ret=1 + echo " no match: '$out' vs $report" >&2 + return 1 fi } @@ -23,34 +89,45 @@ test_splice() { filename="$1" + echo " checking $filename ..." >&2 + full=$(cat "$filename") + rc=$? + if [ $rc -ne 0 ] ; then + return 2 + fi + two=$(echo "$full" | grep -m1 . | cut -c-2) # Make sure full splice has the same contents as a standard read. - do_splice "$filename" 4096 "$full" + echo " splicing 4096 bytes ..." >&2 + if ! do_splice "$filename" 4096 "$full" "full read" ; then + return 1 + fi # Make sure a partial splice see the first two characters. - do_splice "$filename" 2 "$two" + echo " splicing 2 bytes ..." >&2 + if ! do_splice "$filename" 2 "$two" "'$two'" ; then + return 1 + fi + + return 0 } -# proc_single_open(), seq_read() -test_splice /proc/$$/limits -# special open, seq_read() -test_splice /proc/$$/comm +### /proc/$pid/ has no splice interface; these should all fail. +expect_failure "proc_single_open(), seq_read() splice" test_splice /proc/$$/limits +expect_failure "special open(), seq_read() splice" test_splice /proc/$$/comm -# proc_handler, proc_dointvec_minmax -test_splice /proc/sys/fs/nr_open -# proc_handler, proc_dostring -test_splice /proc/sys/kernel/modprobe -# proc_handler, special read -test_splice /proc/sys/kernel/version +### /proc/sys/ has a splice interface; these should all succeed. +expect_success "proc_handler: proc_dointvec_minmax() splice" test_splice /proc/sys/fs/nr_open +expect_success "proc_handler: proc_dostring() splice" test_splice /proc/sys/kernel/modprobe +expect_success "proc_handler: special read splice" test_splice /proc/sys/kernel/version +### /sys/ has no splice interface; these should all fail. if ! [ -d /sys/module/test_module/sections ] ; then - modprobe test_module + expect_success "test_module kernel module load" modprobe test_module fi -# kernfs, attr -test_splice /sys/module/test_module/coresize -# kernfs, binattr -test_splice /sys/module/test_module/sections/.init.text +expect_failure "kernfs attr splice" test_splice /sys/module/test_module/coresize +expect_failure "kernfs binattr splice" test_splice /sys/module/test_module/sections/.init.text exit $ret -- 2.25.1

3 years, 6 months

2
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[PATCH] selftests: lib.mk: Also install "config" and "settings"

by Kees Cook

Installed seccomp tests would time out because the "settings" file was missing. Install both "settings" (needed for proper test execution) and "config" (needed for informational purposes) with the other test targets. Signed-off-by: Kees Cook <keescook(a)chromium.org> --- tools/testing/selftests/lib.mk | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk index 0af84ad48aa7..fa2ac0e56b43 100644 --- a/tools/testing/selftests/lib.mk +++ b/tools/testing/selftests/lib.mk @@ -100,6 +100,7 @@ define INSTALL_RULE $(eval INSTALL_LIST = $(TEST_CUSTOM_PROGS)) $(INSTALL_SINGLE_RULE) $(eval INSTALL_LIST = $(TEST_GEN_PROGS_EXTENDED)) $(INSTALL_SINGLE_RULE) $(eval INSTALL_LIST = $(TEST_GEN_FILES)) $(INSTALL_SINGLE_RULE) + $(eval INSTALL_LIST = $(wildcard config settings)) $(INSTALL_SINGLE_RULE) endef install: all -- 2.25.1

3 years, 6 months

2
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[PATCH 0/2] selftests: futex: Expand futex testing

by André Almeida

This patchset expands test coverage for futex, implementing two new selftests: one for testing different types of futexes and one for the requeue operation. André Almeida (2): selftests: futex: Add futex wait test selftests: futex: Add futex compare requeue test .../selftests/futex/functional/.gitignore | 2 + .../selftests/futex/functional/Makefile | 4 +- .../futex/functional/futex_requeue.c | 145 ++++++++++++++ .../selftests/futex/functional/futex_wait.c | 180 ++++++++++++++++++ .../testing/selftests/futex/functional/run.sh | 6 + 5 files changed, 336 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/futex/functional/futex_requeue.c create mode 100644 tools/testing/selftests/futex/functional/futex_wait.c -- 2.31.1

3 years, 6 months

2
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[PATCH net-next v3 0/3] net/sched: act_vlan: Fix modify to allow 0

by Boris Sukholitko

Currently vlan modification action checks existence of vlan priority by comparing it to 0. Therefore it is impossible to modify existing vlan tag to have priority 0. For example, the following tc command will change the vlan id but will not affect vlan priority: tc filter add dev eth1 ingress matchall action vlan modify id 300 \ priority 0 pipe mirred egress redirect dev eth2 The incoming packet on eth1: ethertype 802.1Q (0x8100), vlan 200, p 4, ethertype IPv4 will be changed to: ethertype 802.1Q (0x8100), vlan 300, p 4, ethertype IPv4 although the user has intended to have p == 0. The fix is to add tcfv_push_prio_exists flag to struct tcf_vlan_params and rely on it when deciding to set the priority. The same flag is used to avoid dumping unset vlan priority. Change Log: v2 -> v3: - Push assumes that the priority is being set - tcf_vlan_get_fill_size accounts for priority existence v1 -> v2: - Do not dump unset priority and fix tests accordingly - Test for priority 0 modification Boris Sukholitko (3): net/sched: act_vlan: Fix modify to allow 0 net/sched: act_vlan: No dump for unset priority net/sched: act_vlan: Test priority 0 modification include/net/tc_act/tc_vlan.h | 1 + net/sched/act_vlan.c | 26 ++++++++++++----- .../tc-testing/tc-tests/actions/vlan.json | 28 +++++++++++++++++-- 3 files changed, 46 insertions(+), 9 deletions(-) -- 2.29.3

3 years, 6 months

4
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tools/testing/selftests/ptrace/vmaccess.c hangs

by Vitaly Chikunov

Hi, Possible ptrace related bug in tools/testing/selftests/ptrace/vmaccess.c - it timeout every time I run it on any kernel I try, in vm or bare metal. Does it run correctly for anybody? Example vmaccess from v5.12 source tree run on 5.13.0+rc2 on bare metal Supermicro server (AMD EPYC): 5.10.35-rt-alt1.rt39:~# /usr/lib/kselftests/ptrace/vmaccess TAP version 13 1..2 # Starting 2 tests from 1 test cases. # RUN global.vmaccess ... # OK global.vmaccess ok 1 global.vmaccess # RUN global.attach ... # attach: Test terminated by timeout # FAIL global.attach not ok 2 global.attach # FAILED: 1 / 2 tests passed. # Totals: pass:1 fail:1 xfail:0 xpass:0 skip:0 error:0 Just to confirm for the latest kernel, it behaves the same [for drm-tip based] on 5.13rc2. Also, just tested on 5.11.21 with the same failure. Other ptrace tests pass. Thanks,

3 years, 6 months

2
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[PATCH] selftests/bpf: Fix return value check in attach_bpf()

by Yu Kuai

use libbpf_get_error() to check the return value of bpf_program__attach(). Reported-by: Hulk Robot <hulkci(a)huawei.com> Signed-off-by: Yu Kuai <yukuai3(a)huawei.com> --- tools/testing/selftests/bpf/benchs/bench_rename.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/benchs/bench_rename.c b/tools/testing/selftests/bpf/benchs/bench_rename.c index c7ec114eca56..b7d4a1d74fca 100644 --- a/tools/testing/selftests/bpf/benchs/bench_rename.c +++ b/tools/testing/selftests/bpf/benchs/bench_rename.c @@ -65,7 +65,7 @@ static void attach_bpf(struct bpf_program *prog) struct bpf_link *link; link = bpf_program__attach(prog); - if (!link) { + if (libbpf_get_error(link)) { fprintf(stderr, "failed to attach program!\n"); exit(1); } -- 2.25.4

3 years, 6 months

5
5
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[PATCH] selftest: Add test for Soft-Dirty PTE bit

by Gabriel Krisman Bertazi

This introduces three tests: 1) Sanity check soft dirty basic semantics: allocate area, clean, dirty, check if the SD bit flipped. 2) Check VMA reuse: validate the VM_SOFTDIRTY usage 3) Check soft-dirty on huge pages This was motivated by Will Deacon's fix commit 912efa17e512 ("mm: proc: Invalidate TLB after clearing soft-dirty page state"). I was tracking the same issue that he fixed, and this test would have caught it. Cc: Will Deacon <will(a)kernel.org> Signed-off-by: Gabriel Krisman Bertazi <krisman(a)collabora.com> --- tools/testing/selftests/Makefile | 1 + tools/testing/selftests/soft-dirty/.gitignore | 1 + tools/testing/selftests/soft-dirty/Makefile | 9 + .../testing/selftests/soft-dirty/soft-dirty.c | 254 ++++++++++++++++++ 4 files changed, 265 insertions(+) create mode 100644 tools/testing/selftests/soft-dirty/.gitignore create mode 100644 tools/testing/selftests/soft-dirty/Makefile create mode 100644 tools/testing/selftests/soft-dirty/soft-dirty.c diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index bc3299a20338..c8dcd7defd33 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -55,6 +55,7 @@ TARGETS += seccomp TARGETS += sgx TARGETS += sigaltstack TARGETS += size +TARGETS += soft-dirty TARGETS += sparc64 TARGETS += splice TARGETS += static_keys diff --git a/tools/testing/selftests/soft-dirty/.gitignore b/tools/testing/selftests/soft-dirty/.gitignore new file mode 100644 index 000000000000..cfb0cfda9bdf --- /dev/null +++ b/tools/testing/selftests/soft-dirty/.gitignore @@ -0,0 +1 @@ +soft-dirty diff --git a/tools/testing/selftests/soft-dirty/Makefile b/tools/testing/selftests/soft-dirty/Makefile new file mode 100644 index 000000000000..d76ad8e0f10d --- /dev/null +++ b/tools/testing/selftests/soft-dirty/Makefile @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 +top_srcdir = ../../../.. +INSTALL_HDR_PATH = $(top_srcdir)/usr +LINUX_HDR_PATH = $(INSTALL_HDR_PATH)/include/ + +CFLAGS += -Wall -I$(LINUX_HDR_PATH) -O0 -g3 + +TEST_GEN_PROGS := soft-dirty +include ../lib.mk diff --git a/tools/testing/selftests/soft-dirty/soft-dirty.c b/tools/testing/selftests/soft-dirty/soft-dirty.c new file mode 100644 index 000000000000..47af76f9df50 --- /dev/null +++ b/tools/testing/selftests/soft-dirty/soft-dirty.c @@ -0,0 +1,254 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <stdint.h> +#include <unistd.h> +#include <stdio.h> +#include <unistd.h> +#include <syscall.h> +#include <errno.h> +#include <stdlib.h> +#include <sys/mman.h> +#include <err.h> +#include <string.h> +#include <stdbool.h> +#include <malloc.h> + +#define PAGEMAP_PATH "/proc/self/pagemap" +#define CLEAR_REFS_PATH "/proc/self/clear_refs" +#define SMAP_PATH "/proc/self/smaps" +#define MAX_LINE_LENGTH 512 + +#define TEST_ITERATIONS 10000 + +#define PMD_SIZE_PATH "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size" + +int clear_refs; +int pagemap; + +int pagesize; +int mmap_size; /* Size of test region */ + +static void clear_all_refs(void) +{ + if (write(clear_refs, "4\n", 2) != 2) + printf("%s: failed to clear references\n", __func__); +} + +static void touch_page(char *map, int n) +{ + map[(page_size * n) + 1]++; +} + +static int check_page(char *map, uint64_t n, int clear) +{ + uint64_t off; + uint64_t buf = 0; + + off = (n + ((uint64_t)map >> 12)) << 3; + + if (lseek(pagemap, off, SEEK_SET) == (off_t) -1) + errx(EXIT_FAILURE, "pagemap llseek failed"); + + if (read(pagemap, &buf, 8) != 8) + errx(EXIT_FAILURE, "pagemap read failed"); + + if (clear) + clear_all_refs(); + + return ((buf >> 55) & 1); +} + +static void test_simple(void) +{ + int i; + char *map; + + printf("- Test %s:\n", __func__); + + map = aligned_alloc(page_size, mmap_size); + if (!map) + errx(EXIT_FAILURE, "mmap"); + + clear_all_refs(); + + for (i = 0 ; i < TEST_ITERATIONS; i++) { + if (check_page(map, 2, 1) == 1) { + errx(EXIT_FAILURE, "dirty bit was 1, but should be 0 (i=%d)", i); + break; + } + + touch_page(map, 2); + + if (check_page(map, 2, 1) == 0) { + errx(EXIT_FAILURE, "dirty bit was 0, but should be 1 (i=%d)", i); + break; + } + + } + free(map); + + printf("success\n"); +} + +static void test_vma_reuse(void) +{ + char *map, *map2; + + printf("- Test %s:\n", __func__); + + map = (char *) 0x900000000000; + map = mmap(map, mmap_size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0); + if (map == MAP_FAILED) + errx(EXIT_FAILURE, "mmap"); + + clear_all_refs(); + touch_page(map, 2); + + munmap(map, mmap_size); + map2 = mmap(map, mmap_size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0); + if (map2 == MAP_FAILED) + errx(EXIT_FAILURE, "mmap2"); + + if (map != map2) + errx(EXIT_FAILURE, "map != map2"); + + if (check_page(map, 2, 1) == 0) + errx(-1, "map/unmap lost dirty"); + + munmap(map2, mmap_size); + + printf("success\n"); +} + +/* + * read_pmd_pagesize(), check_for_pattern() and check_huge() adapted + * from 'tools/testing/selftest/vm/split_huge_page_test.c' + */ +static uint64_t read_pmd_pagesize(void) +{ + int fd; + char buf[20]; + ssize_t num_read; + + fd = open(PMD_SIZE_PATH, O_RDONLY); + if (fd == -1) + errx(EXIT_FAILURE, "Open hpage_pmd_size failed"); + + num_read = read(fd, buf, 19); + if (num_read < 1) { + close(fd); + errx(EXIT_FAILURE, "Read hpage_pmd_size failed"); + } + buf[num_read] = '\0'; + close(fd); + + return strtoul(buf, NULL, 10); +} + +static bool check_for_pattern(FILE *fp, const char *pattern, char *buf) +{ + while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) { + if (!strncmp(buf, pattern, strlen(pattern))) + return true; + } + return false; +} + +static uint64_t check_huge(void *addr) +{ + uint64_t thp = 0; + int ret; + FILE *fp; + char buffer[MAX_LINE_LENGTH]; + char addr_pattern[MAX_LINE_LENGTH]; + + ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "%08lx-", + (unsigned long) addr); + if (ret >= MAX_LINE_LENGTH) + errx(EXIT_FAILURE, "%s: Pattern is too long\n", __func__); + + fp = fopen(SMAP_PATH, "r"); + if (!fp) + errx(EXIT_FAILURE, "%s: Failed to open file %s\n", __func__, SMAP_PATH); + + if (!check_for_pattern(fp, addr_pattern, buffer)) + goto err_out; + + /* + * Fetch the AnonHugePages: in the same block and check the number of + * hugepages. + */ + if (!check_for_pattern(fp, "AnonHugePages:", buffer)) + goto err_out; + + if (sscanf(buffer, "AnonHugePages:%10ld kB", &thp) != 1) + errx(EXIT_FAILURE, "Reading smap error\n"); + +err_out: + fclose(fp); + + return thp; +} + +static void test_hugepage(void) +{ + char *map; + int i, ret; + size_t hpage_len = read_pmd_pagesize(); + + printf("- Test %s:\n", __func__); + + map = memalign(hpage_len, hpage_len); + if (!map) + errx(EXIT_FAILURE, "memalign"); + + ret = madvise(map, hpage_len, MADV_HUGEPAGE); + if (ret) + errx(EXIT_FAILURE, "madvise %d", ret); + + for (i = 0; i < hpage_len; i++) + map[i] = (char)i; + + if (!check_huge(map)) + errx(EXIT_FAILURE, "failed to allocate THP"); + + clear_all_refs(); + for (i = 0 ; i < TEST_ITERATIONS ; i++) { + if (check_page(map, 2, 1) == 1) { + errx(EXIT_FAILURE, "dirty bit was 1, but should be 0 (i=%d)", i); + break; + } + + touch_page(map, 2); + + if (check_page(map, 2, 1) == 0) { + errx(EXIT_FAILURE, "dirty bit was 0, but should be 1 (i=%d)", i); + break; + } + } + munmap(map, mmap_size); + + printf("success\n"); +} + +int main(int argc, char **argv) +{ + pagemap = open(PAGEMAP_PATH, O_RDONLY, 0); + if (pagemap < 0) + errx(EXIT_FAILURE, "Failed to open %s", PAGEMAP_PATH); + + clear_refs = open(CLEAR_REFS_PATH, O_WRONLY, 0); + if (clear_refs < 0) + errx(EXIT_FAILURE, "Failed to open %s", CLEAR_REFS_PATH); + + pagesize = getpagesize(); + mmap_size = 10 * pagesize(); + + test_simple(); + test_vma_reuse(); + test_hugepage(); + + return 0; +} -- 2.31.0

3 years, 6 months

1
0
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[PATCH -next] khugepaged: selftests: remove debug_cow

by Nanyong Sun

The debug_cow attribute had been removed since commit 4958e4d86ecb01 ("mm: thp: remove debug_cow switch"), so remove it in selftest code too, otherwise the khugepaged test will fail. Signed-off-by: Nanyong Sun <sunnanyong(a)huawei.com> --- tools/testing/selftests/vm/khugepaged.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/tools/testing/selftests/vm/khugepaged.c b/tools/testing/selftests/vm/khugepaged.c index 8b7582130..155120b67 100644 --- a/tools/testing/selftests/vm/khugepaged.c +++ b/tools/testing/selftests/vm/khugepaged.c @@ -86,7 +86,6 @@ struct settings { enum thp_enabled thp_enabled; enum thp_defrag thp_defrag; enum shmem_enabled shmem_enabled; - bool debug_cow; bool use_zero_page; struct khugepaged_settings khugepaged; }; @@ -95,7 +94,6 @@ static struct settings default_settings = { .thp_enabled = THP_MADVISE, .thp_defrag = THP_DEFRAG_ALWAYS, .shmem_enabled = SHMEM_NEVER, - .debug_cow = 0, .use_zero_page = 0, .khugepaged = { .defrag = 1, @@ -268,7 +266,6 @@ static void write_settings(struct settings *settings) write_string("defrag", thp_defrag_strings[settings->thp_defrag]); write_string("shmem_enabled", shmem_enabled_strings[settings->shmem_enabled]); - write_num("debug_cow", settings->debug_cow); write_num("use_zero_page", settings->use_zero_page); write_num("khugepaged/defrag", khugepaged->defrag); @@ -304,7 +301,6 @@ static void save_settings(void) .thp_defrag = read_string("defrag", thp_defrag_strings), .shmem_enabled = read_string("shmem_enabled", shmem_enabled_strings), - .debug_cow = read_num("debug_cow"), .use_zero_page = read_num("use_zero_page"), }; saved_settings.khugepaged = (struct khugepaged_settings) { -- 2.25.1

3 years, 6 months

3
2
0 0

[PATCH v2 0/4] kunit: tool: add support for QEMU

by Brendan Higgins

TL;DR: Add support to kunit_tool to dispatch tests via QEMU. Also add support to immediately shutdown a kernel after running KUnit tests. Background ---------- KUnit has supported running on all architectures for quite some time; however, kunit_tool - the script commonly used to invoke KUnit tests - has only fully supported KUnit run on UML. Its functionality has been broken up for some time to separate the configure, build, run, and parse phases making it possible to be used in part on other architectures to a small extent. Nevertheless, kunit_tool has not supported running tests on other architectures. What this patchset does ----------------------- This patchset introduces first class support to kunit_tool for KUnit to be run on many popular architectures via QEMU. It does this by adding two new flags: `--arch` and `--cross_compile`. `--arch` allows an architecture to be specified by the name the architecture is given in `arch/`. It uses the specified architecture to select a minimal amount of Kconfigs and QEMU configs needed for the architecture to run in QEMU and provide a console from which KTAP results can be scraped. `--cross_compile` allows a toolchain prefix to be specified to make similar to how `CROSS_COMPILE` is used. Additionally, this patchset revives the previously considered "kunit: tool: add support for QEMU"[1] patchs. The motivation for this new kernel command line flags, `kunit_shutdown`, is to better support running KUnit tests inside of QEMU. For most popular architectures, QEMU can be made to terminate when the Linux kernel that is being run is reboted, halted, or powered off. As Kees pointed out in a previous discussion[2], it is possible to make a kernel initrd that can reboot the kernel immediately, doing this for every architecture would likely be infeasible. Instead, just having an option for the kernel to shutdown when it is done with testing seems a lot simpler, especially since it is an option which would only available in testing configurations of the kernel anyway. Changes since last revision --------------------------- I pulled out the QemuConfigs into their own files; the way in which I did this also allows new QemuConfigs to be added without making any changes to kunit_tool. I changed how Kconfigs are loaded; they are now merged inside of kunit_tool instead of letting Kbuild do it. I also made numerous nit fixes. Finally, I added a new section to the kunit_tool documentation to document the new command line flags I added. [1] http://patches.linaro.org/patch/208336/ [2] https://lkml.org/lkml/2020/6/26/988 Brendan Higgins (3): Documentation: Add kunit_shutdown to kernel-parameters.txt kunit: tool: add support for QEMU Documentation: kunit: document support for QEMU in kunit_tool David Gow (1): kunit: Add 'kunit_shutdown' option .../admin-guide/kernel-parameters.txt | 8 + Documentation/dev-tools/kunit/kunit-tool.rst | 48 +++++ Documentation/dev-tools/kunit/usage.rst | 50 +++-- lib/kunit/executor.c | 20 ++ tools/testing/kunit/kunit.py | 57 +++++- tools/testing/kunit/kunit_config.py | 7 +- tools/testing/kunit/kunit_kernel.py | 177 +++++++++++++++--- tools/testing/kunit/kunit_parser.py | 2 +- tools/testing/kunit/kunit_tool_test.py | 18 +- tools/testing/kunit/qemu_config.py | 16 ++ tools/testing/kunit/qemu_configs/alpha.py | 10 + tools/testing/kunit/qemu_configs/arm.py | 13 ++ tools/testing/kunit/qemu_configs/arm64.py | 12 ++ tools/testing/kunit/qemu_configs/i386.py | 10 + tools/testing/kunit/qemu_configs/powerpc.py | 12 ++ tools/testing/kunit/qemu_configs/riscv.py | 31 +++ tools/testing/kunit/qemu_configs/s390.py | 14 ++ tools/testing/kunit/qemu_configs/sparc.py | 10 + tools/testing/kunit/qemu_configs/x86_64.py | 10 + 19 files changed, 471 insertions(+), 54 deletions(-) create mode 100644 tools/testing/kunit/qemu_config.py create mode 100644 tools/testing/kunit/qemu_configs/alpha.py create mode 100644 tools/testing/kunit/qemu_configs/arm.py create mode 100644 tools/testing/kunit/qemu_configs/arm64.py create mode 100644 tools/testing/kunit/qemu_configs/i386.py create mode 100644 tools/testing/kunit/qemu_configs/powerpc.py create mode 100644 tools/testing/kunit/qemu_configs/riscv.py create mode 100644 tools/testing/kunit/qemu_configs/s390.py create mode 100644 tools/testing/kunit/qemu_configs/sparc.py create mode 100644 tools/testing/kunit/qemu_configs/x86_64.py base-commit: d7eab3df8f39b116d934bc17f8070861e18cfb62 -- 2.31.1.818.g46aad6cb9e-goog

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[PATCH v3 bpf-next 0/2] libbpf: BTF dumper support for typed data

by Alan Maguire

Add a libbpf dumper function that supports dumping a representation of data passed in using the BTF id associated with the data in a manner similar to the bpf_snprintf_btf helper. Default output format is identical to that dumped by bpf_snprintf_btf() (bar using tabs instead of spaces for indentation); for example, a "struct sk_buff" representation would look like this: (struct sk_buff){ (union){ (struct){ .next = (struct sk_buff *)0xffffffffffffffff, .prev = (struct sk_buff *)0xffffffffffffffff, (union){ .dev = (struct net_device *)0xffffffffffffffff, .dev_scratch = (long unsigned int)18446744073709551615, }, }, ... Patch 1 implements the dump functionality in a manner similar to that in kernel/bpf/btf.c, but with a view to fitting into libbpf more naturally. For example, rather than using flags, boolean dump options are used to control output. In addition, rather than combining checks for display (such as is this field zero?) and actual display - as is done for the kernel code - the code is organized to separate zero and overflow checks from type display. Patch 2 consists of selftests that utilize a dump printf function to snprintf the dump output to a string for comparison with expected output. Tests deliberately mirror those in snprintf_btf helper test to keep output consistent, but also cover overflow handling, var/section display. Apologies for the long time lag between v2 and this revision. Changes since v2 [1] - Renamed function to btf_dump__dump_type_data, reorganized arguments such that opts are last (Andrii) - Modified code to separate questions about display such as have we overflowed?/is this field zero? from actual display of typed data, such that we ask those questions separately from the code that actually displays typed data (Andrii) - Reworked code to handle overflow - where we do not provide enough data for the type we wish to display - by returning -E2BIG and attempting to present as much data as possible. Such a mode of operation allows for tracers which retrieve partial data (such as first 1024 bytes of a "struct task_struct" say), and want to display that partial data, while also knowing that it is not the full type. Such tracers can then denote this (perhaps via "..." or similar). - Explored reusing existing type emit functions, such as passing in a type id stack with a single type id to btf_dump_emit_type_chain() to support the display of typed data where a "cast" is prepended to the data to denote its type; "(int)1", "(struct foo){", etc. However the task of emitting a ".field_name = (typecast)" did not match well with model of walking the stack to display innermost types first and made the resultant code harder to read. Added a dedicated btf_dump_emit_type_name() function instead which is only ~70 lines (Andrii) - Various cleanups around bitfield macros, unneeded member iteration macros, avoiding compiler complaints when displaying int da ta by casting to long long, etc (Andrii) - Use DECLARE_LIBBPF_OPTS() in defining opts for tests (Andrii) - Added more type tests, overflow tests, var tests and section tests. Changes since RFC [2] - The initial approach explored was to share the kernel code with libbpf using #defines to paper over the different needs; however it makes more sense to try and fit in with libbpf code style for maintenance. A comment in the code points at the implementation in kernel/bpf/btf.c and notes that any issues found in it should be fixed there or vice versa; mirroring the tests should help with this also (Andrii) [1] https://lore.kernel.org/bpf/1610921764-7526-1-git-send-email-alan.maguire@o… [2] https://lore.kernel.org/bpf/1610386373-24162-1-git-send-email-alan.maguire@… Alan Maguire (2): libbpf: BTF dumper support for typed data selftests/bpf: add dump type data tests to btf dump tests tools/lib/bpf/btf.h | 17 + tools/lib/bpf/btf_dump.c | 901 ++++++++++++++++++++++ tools/lib/bpf/libbpf.map | 5 + tools/testing/selftests/bpf/prog_tests/btf_dump.c | 524 +++++++++++++ 4 files changed, 1447 insertions(+) -- 1.8.3.1

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Linux-kselftest-mirror May 2021