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[PATCH 2/2] lib/test: convert lib/test_list_sort.c to use KUnit

by Daniel Latypov

Functionally, this just means that the test output will be slightly changed and it'll now depend on CONFIG_KUNIT=y/m. It'll still run at boot time and can still be built as a loadable module. There was a pre-existing patch to convert this test that I found later, here [1]. Compared to [1], this patch doesn't rename files and uses KUnit features more heavily (i.e. does more than converting pr_err() calls to KUNIT_FAIL()). What this conversion gives us: * a shorter test thanks to KUnit's macros * a way to run this a bit more easily via kunit.py (and CONFIG_KUNIT_ALL_TESTS=y) [2] * a structured way of reporting pass/fail * uses kunit-managed allocations to avoid the risk of memory leaks * more descriptive error messages: * i.e. it prints out which fields are invalid, what the expected values are, etc. What this conversion does not do: * change the name of the file (and thus the name of the module) * change the name of the config option Leaving these as-is for now to minimize the impact to people wanting to run this test. IMO, that concern trumps following KUnit's style guide for both names, at least for now. [1] https://lore.kernel.org/linux-kselftest/20201015014616.309000-1-vitor@massa… [2] Can be run via $ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF CONFIG_KUNIT=y CONFIG_TEST_LIST_SORT=y EOF [16:55:56] Configuring KUnit Kernel ... [16:55:56] Building KUnit Kernel ... [16:56:29] Starting KUnit Kernel ... [16:56:32] ============================================================ [16:56:32] ======== [PASSED] list_sort ======== [16:56:32] [PASSED] list_sort_test [16:56:32] ============================================================ [16:56:32] Testing complete. 1 tests run. 0 failed. 0 crashed. [16:56:32] Elapsed time: 35.668s total, 0.001s configuring, 32.725s building, 0.000s running Note: the build time is as after a `make mrproper`. Signed-off-by: Daniel Latypov <dlatypov(a)google.com> --- lib/Kconfig.debug | 5 +- lib/test_list_sort.c | 128 +++++++++++++++++-------------------------- 2 files changed, 54 insertions(+), 79 deletions(-) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 417c3d3e521b..09a0cc8a55cc 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1999,8 +1999,9 @@ config LKDTM Documentation/fault-injection/provoke-crashes.rst config TEST_LIST_SORT - tristate "Linked list sorting test" - depends on DEBUG_KERNEL || m + tristate "Linked list sorting test" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS help Enable this to turn on 'list_sort()' function test. This test is executed only once during system boot (so affects only boot time), diff --git a/lib/test_list_sort.c b/lib/test_list_sort.c index 1f017d3b610e..ccfd98dbf57c 100644 --- a/lib/test_list_sort.c +++ b/lib/test_list_sort.c @@ -1,5 +1,5 @@ // SPDX-License-Identifier: GPL-2.0-only -#define pr_fmt(fmt) "list_sort_test: " fmt +#include <kunit/test.h> #include <linux/kernel.h> #include <linux/list_sort.h> @@ -23,67 +23,52 @@ struct debug_el { struct list_head list; unsigned int poison2; int value; - unsigned serial; + unsigned int serial; }; -/* Array, containing pointers to all elements in the test list */ -static struct debug_el **elts __initdata; - -static int __init check(struct debug_el *ela, struct debug_el *elb) +static void check(struct kunit *test, struct debug_el *ela, struct debug_el *elb) { - if (ela->serial >= TEST_LIST_LEN) { - pr_err("error: incorrect serial %d\n", ela->serial); - return -EINVAL; - } - if (elb->serial >= TEST_LIST_LEN) { - pr_err("error: incorrect serial %d\n", elb->serial); - return -EINVAL; - } - if (elts[ela->serial] != ela || elts[elb->serial] != elb) { - pr_err("error: phantom element\n"); - return -EINVAL; - } - if (ela->poison1 != TEST_POISON1 || ela->poison2 != TEST_POISON2) { - pr_err("error: bad poison: %#x/%#x\n", - ela->poison1, ela->poison2); - return -EINVAL; - } - if (elb->poison1 != TEST_POISON1 || elb->poison2 != TEST_POISON2) { - pr_err("error: bad poison: %#x/%#x\n", - elb->poison1, elb->poison2); - return -EINVAL; - } - return 0; + struct debug_el **elts = test->priv; + + KUNIT_EXPECT_LT_MSG(test, ela->serial, (unsigned int)TEST_LIST_LEN, "incorrect serial"); + KUNIT_EXPECT_LT_MSG(test, elb->serial, (unsigned int)TEST_LIST_LEN, "incorrect serial"); + + KUNIT_EXPECT_PTR_EQ_MSG(test, elts[ela->serial], ela, "phantom element"); + KUNIT_EXPECT_PTR_EQ_MSG(test, elts[elb->serial], elb, "phantom element"); + + KUNIT_EXPECT_EQ_MSG(test, ela->poison1, TEST_POISON1, "bad poison"); + KUNIT_EXPECT_EQ_MSG(test, ela->poison2, TEST_POISON2, "bad poison"); + + KUNIT_EXPECT_EQ_MSG(test, elb->poison1, TEST_POISON1, "bad poison"); + KUNIT_EXPECT_EQ_MSG(test, elb->poison2, TEST_POISON2, "bad poison"); } -static int __init cmp(void *priv, struct list_head *a, struct list_head *b) +/* `priv` is the test pointer so check() can fail the test if the list is invalid. */ +static int cmp(void *priv, struct list_head *a, struct list_head *b) { struct debug_el *ela, *elb; ela = container_of(a, struct debug_el, list); elb = container_of(b, struct debug_el, list); - check(ela, elb); + check(priv, ela, elb); return ela->value - elb->value; } -static int __init list_sort_test(void) +static void list_sort_test(struct kunit *test) { - int i, count = 1, err = -ENOMEM; - struct debug_el *el; + int i, count = 1; + struct debug_el *el, **elts; struct list_head *cur; LIST_HEAD(head); - pr_debug("start testing list_sort()\n"); - - elts = kcalloc(TEST_LIST_LEN, sizeof(*elts), GFP_KERNEL); - if (!elts) - return err; + elts = kunit_kcalloc(test, TEST_LIST_LEN, sizeof(*elts), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elts); + test->priv = elts; for (i = 0; i < TEST_LIST_LEN; i++) { - el = kmalloc(sizeof(*el), GFP_KERNEL); - if (!el) - goto exit; + el = kunit_kmalloc(test, sizeof(*el), GFP_KERNEL); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, el); /* force some equivalencies */ el->value = prandom_u32() % (TEST_LIST_LEN / 3); @@ -94,55 +79,44 @@ static int __init list_sort_test(void) list_add_tail(&el->list, &head); } - list_sort(NULL, &head, cmp); + list_sort(test, &head, cmp); - err = -EINVAL; for (cur = head.next; cur->next != &head; cur = cur->next) { struct debug_el *el1; int cmp_result; - if (cur->next->prev != cur) { - pr_err("error: list is corrupted\n"); - goto exit; - } + KUNIT_ASSERT_PTR_EQ_MSG(test, cur->next->prev, cur, + "list is corrupted"); - cmp_result = cmp(NULL, cur, cur->next); - if (cmp_result > 0) { - pr_err("error: list is not sorted\n"); - goto exit; - } + cmp_result = cmp(test, cur, cur->next); + KUNIT_ASSERT_LE_MSG(test, cmp_result, 0, "list is not sorted"); el = container_of(cur, struct debug_el, list); el1 = container_of(cur->next, struct debug_el, list); - if (cmp_result == 0 && el->serial >= el1->serial) { - pr_err("error: order of equivalent elements not " - "preserved\n"); - goto exit; + if (cmp_result == 0) { + KUNIT_ASSERT_LE_MSG(test, el->serial, el1->serial, + "order of equivalent elements not preserved"); } - if (check(el, el1)) { - pr_err("error: element check failed\n"); - goto exit; - } + check(test, el, el1); count++; } - if (head.prev != cur) { - pr_err("error: list is corrupted\n"); - goto exit; - } + KUNIT_EXPECT_PTR_EQ_MSG(test, head.prev, cur, "list is corrupted"); + KUNIT_EXPECT_EQ_MSG(test, count, TEST_LIST_LEN, + "list length changed after sorting!"); +} - if (count != TEST_LIST_LEN) { - pr_err("error: bad list length %d", count); - goto exit; - } +static struct kunit_case list_sort_cases[] = { + KUNIT_CASE(list_sort_test), + {} +}; + +static struct kunit_suite list_sort_suite = { + .name = "list_sort", + .test_cases = list_sort_cases, +}; + +kunit_test_suites(&list_sort_suite); - err = 0; -exit: - for (i = 0; i < TEST_LIST_LEN; i++) - kfree(elts[i]); - kfree(elts); - return err; -} -module_init(list_sort_test); MODULE_LICENSE("GPL"); -- 2.31.1.498.g6c1eba8ee3d-goog

4 years, 2 months

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[PATCH v2 1/2] kunit: introduce kunit_kmalloc_array/kunit_kcalloc() helpers

by Daniel Latypov

Add in: * kunit_kmalloc_array() and wire up kunit_kmalloc() to be a special case of it. * kunit_kcalloc() for symmetry with kunit_kzalloc() This should using KUnit more natural by making it more similar to the existing *alloc() APIs. And while we shouldn't necessarily be writing unit tests where overflow should be a concern, it can't hurt to be safe. Signed-off-by: Daniel Latypov <dlatypov(a)google.com> Reviewed-by: David Gow <davidgow(a)google.com> Reviewed-by: Brendan Higgins <brendanhiggins(a)google.com> --- v1 -> v2: s/kzalloc/kcalloc in doc comment. --- include/kunit/test.h | 36 ++++++++++++++++++++++++++++++++---- lib/kunit/test.c | 22 ++++++++++++---------- 2 files changed, 44 insertions(+), 14 deletions(-) diff --git a/include/kunit/test.h b/include/kunit/test.h index 49601c4b98b8..e8ecb69dd567 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -577,16 +577,30 @@ static inline int kunit_destroy_named_resource(struct kunit *test, void kunit_remove_resource(struct kunit *test, struct kunit_resource *res); /** - * kunit_kmalloc() - Like kmalloc() except the allocation is *test managed*. + * kunit_kmalloc_array() - Like kmalloc_array() except the allocation is *test managed*. * @test: The test context object. + * @n: number of elements. * @size: The size in bytes of the desired memory. * @gfp: flags passed to underlying kmalloc(). * - * Just like `kmalloc(...)`, except the allocation is managed by the test case + * Just like `kmalloc_array(...)`, except the allocation is managed by the test case * and is automatically cleaned up after the test case concludes. See &struct * kunit_resource for more information. */ -void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp); +void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t flags); + +/** + * kunit_kmalloc() - Like kmalloc() except the allocation is *test managed*. + * @test: The test context object. + * @size: The size in bytes of the desired memory. + * @gfp: flags passed to underlying kmalloc(). + * + * See kmalloc() and kunit_kmalloc_array() for more information. + */ +static inline void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp) +{ + return kunit_kmalloc_array(test, 1, size, gfp); +} /** * kunit_kfree() - Like kfree except for allocations managed by KUnit. @@ -601,13 +615,27 @@ void kunit_kfree(struct kunit *test, const void *ptr); * @size: The size in bytes of the desired memory. * @gfp: flags passed to underlying kmalloc(). * - * See kzalloc() and kunit_kmalloc() for more information. + * See kzalloc() and kunit_kmalloc_array() for more information. */ static inline void *kunit_kzalloc(struct kunit *test, size_t size, gfp_t gfp) { return kunit_kmalloc(test, size, gfp | __GFP_ZERO); } +/** + * kunit_kcalloc() - Just like kunit_kmalloc_array(), but zeroes the allocation. + * @test: The test context object. + * @n: number of elements. + * @size: The size in bytes of the desired memory. + * @gfp: flags passed to underlying kmalloc(). + * + * See kcalloc() and kunit_kmalloc_array() for more information. + */ +static inline void *kunit_kcalloc(struct kunit *test, size_t n, size_t size, gfp_t flags) +{ + return kunit_kmalloc_array(test, n, size, flags | __GFP_ZERO); +} + void kunit_cleanup(struct kunit *test); void kunit_log_append(char *log, const char *fmt, ...); diff --git a/lib/kunit/test.c b/lib/kunit/test.c index 2f6cc0123232..41fa46b14c3b 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -573,41 +573,43 @@ int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match, } EXPORT_SYMBOL_GPL(kunit_destroy_resource); -struct kunit_kmalloc_params { +struct kunit_kmalloc_array_params { + size_t n; size_t size; gfp_t gfp; }; -static int kunit_kmalloc_init(struct kunit_resource *res, void *context) +static int kunit_kmalloc_array_init(struct kunit_resource *res, void *context) { - struct kunit_kmalloc_params *params = context; + struct kunit_kmalloc_array_params *params = context; - res->data = kmalloc(params->size, params->gfp); + res->data = kmalloc_array(params->n, params->size, params->gfp); if (!res->data) return -ENOMEM; return 0; } -static void kunit_kmalloc_free(struct kunit_resource *res) +static void kunit_kmalloc_array_free(struct kunit_resource *res) { kfree(res->data); } -void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp) +void *kunit_kmalloc_array(struct kunit *test, size_t n, size_t size, gfp_t gfp) { - struct kunit_kmalloc_params params = { + struct kunit_kmalloc_array_params params = { .size = size, + .n = n, .gfp = gfp }; return kunit_alloc_resource(test, - kunit_kmalloc_init, - kunit_kmalloc_free, + kunit_kmalloc_array_init, + kunit_kmalloc_array_free, gfp, &params); } -EXPORT_SYMBOL_GPL(kunit_kmalloc); +EXPORT_SYMBOL_GPL(kunit_kmalloc_array); void kunit_kfree(struct kunit *test, const void *ptr) { base-commit: cda689f8708b6bef0b921c3a17fcdecbe959a079 -- 2.31.1.527.g47e6f16901-goog

4 years, 2 months

1
1
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[PATCH v2] kbuild: replace LANG=C with LC_ALL=C

by Masahiro Yamada

LANG gives a weak default to each LC_* in case it is not explicitly defined. LC_ALL, if set, overrides all other LC_* variables. LANG < LC_CTYPE, LC_COLLATE, LC_MONETARY, LC_NUMERIC, ... < LC_ALL This is why documentation such as [1] suggests to set LC_ALL in build scripts to get the deterministic result. LANG=C is not strong enough to override LC_* that may be set by end users. [1]: https://reproducible-builds.org/docs/locales/ Signed-off-by: Masahiro Yamada <masahiroy(a)kernel.org> Acked-by: Michael Ellerman <mpe(a)ellerman.id.au> (powerpc) Reviewed-by: Matthias Maennich <maennich(a)google.com> Acked-by: Matthieu Baerts <matthieu.baerts(a)tessares.net> (mptcp) --- Changes in v2: - rebase arch/powerpc/boot/wrapper | 2 +- scripts/nsdeps | 2 +- scripts/recordmcount.pl | 2 +- scripts/setlocalversion | 2 +- scripts/tags.sh | 2 +- tools/testing/selftests/net/mptcp/mptcp_connect.sh | 2 +- usr/gen_initramfs.sh | 2 +- 7 files changed, 7 insertions(+), 7 deletions(-) diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper index 41fa0a8715e3..cdb796b76e2e 100755 --- a/arch/powerpc/boot/wrapper +++ b/arch/powerpc/boot/wrapper @@ -191,7 +191,7 @@ if [ -z "$kernel" ]; then kernel=vmlinux fi -LANG=C elfformat="`${CROSS}objdump -p "$kernel" | grep 'file format' | awk '{print $4}'`" +LC_ALL=C elfformat="`${CROSS}objdump -p "$kernel" | grep 'file format' | awk '{print $4}'`" case "$elfformat" in elf64-powerpcle) format=elf64lppc ;; elf64-powerpc) format=elf32ppc ;; diff --git a/scripts/nsdeps b/scripts/nsdeps index e8ce2a4d704a..04c4b96e95ec 100644 --- a/scripts/nsdeps +++ b/scripts/nsdeps @@ -44,7 +44,7 @@ generate_deps() { for source_file in $mod_source_files; do sed '/MODULE_IMPORT_NS/Q' $source_file > ${source_file}.tmp offset=$(wc -l ${source_file}.tmp | awk '{print $1;}') - cat $source_file | grep MODULE_IMPORT_NS | LANG=C sort -u >> ${source_file}.tmp + cat $source_file | grep MODULE_IMPORT_NS | LC_ALL=C sort -u >> ${source_file}.tmp tail -n +$((offset +1)) ${source_file} | grep -v MODULE_IMPORT_NS >> ${source_file}.tmp if ! diff -q ${source_file} ${source_file}.tmp; then mv ${source_file}.tmp ${source_file} diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl index 867860ea57da..0a7fc9507d6f 100755 --- a/scripts/recordmcount.pl +++ b/scripts/recordmcount.pl @@ -497,7 +497,7 @@ sub update_funcs # # Step 2: find the sections and mcount call sites # -open(IN, "LANG=C $objdump -hdr $inputfile|") || die "error running $objdump"; +open(IN, "LC_ALL=C $objdump -hdr $inputfile|") || die "error running $objdump"; my $text; diff --git a/scripts/setlocalversion b/scripts/setlocalversion index bb709eda96cd..db941f6d9591 100755 --- a/scripts/setlocalversion +++ b/scripts/setlocalversion @@ -126,7 +126,7 @@ scm_version() fi # Check for svn and a svn repo. - if rev=$(LANG= LC_ALL= LC_MESSAGES=C svn info 2>/dev/null | grep '^Last Changed Rev'); then + if rev=$(LC_ALL=C svn info 2>/dev/null | grep '^Last Changed Rev'); then rev=$(echo $rev | awk '{print $NF}') printf -- '-svn%s' "$rev" diff --git a/scripts/tags.sh b/scripts/tags.sh index fd96734deff1..db8ba411860a 100755 --- a/scripts/tags.sh +++ b/scripts/tags.sh @@ -326,5 +326,5 @@ esac # Remove structure forward declarations. if [ -n "$remove_structs" ]; then - LANG=C sed -i -e '/^$[a-zA-Z_][a-zA-Z0-9_]*$\t.*\t\/\^struct \1;.*\$\/;"\tx$/d' $1 + LC_ALL=C sed -i -e '/^$[a-zA-Z_][a-zA-Z0-9_]*$\t.*\t\/\^struct \1;.*\$\/;"\tx$/d' $1 fi diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh index 9236609731b1..3c4cb72ed8a4 100755 --- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh +++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh @@ -274,7 +274,7 @@ check_mptcp_disabled() ip netns exec ${disabled_ns} sysctl -q net.mptcp.enabled=0 local err=0 - LANG=C ip netns exec ${disabled_ns} ./mptcp_connect -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \ + LC_ALL=C ip netns exec ${disabled_ns} ./mptcp_connect -p 10000 -s MPTCP 127.0.0.1 < "$cin" 2>&1 | \ grep -q "^socket: Protocol not available$" && err=1 ip netns delete ${disabled_ns} diff --git a/usr/gen_initramfs.sh b/usr/gen_initramfs.sh index 8ae831657e5d..63476bb70b41 100755 --- a/usr/gen_initramfs.sh +++ b/usr/gen_initramfs.sh @@ -147,7 +147,7 @@ dir_filelist() { header "$1" srcdir=$(echo "$1" | sed -e 's://*:/:g') - dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LANG=C sort) + dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LC_ALL=C sort) # If $dirlist is only one line, then the directory is empty if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then -- 2.27.0

4 years, 2 months

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[PATCH v4] selftests/mincore: get readahead size for check_file_mmap()

by Jeffle Xu

The readahead size used to be 2MB, thus it's reasonable to set the file size as 4MB when checking check_file_mmap(). However since commit c2e4cd57cfa1 ("block: lift setting the readahead size into the block layer"), readahead size could be as large as twice the io_opt, and thus the hardcoded file size no longer works. check_file_mmap() may report "Read-ahead pages reached the end of the file" when the readahead size actually exceeds the file size in this case. To fix this issue, read the exact readahead window size via BLKRAGET ioctl. Since now we have the readahead window size, take a more fine-grained check. It is worth noting that this fine-grained check may be broken as the sync readahead algorithm of kernel changes. It may be acceptable since the algorithm of readahead ranging should be quite stable, and we could tune the test case accorddingly if the algorithm indeed changes. Reported-by: James Wang <jnwang(a)linux.alibaba.com> Acked-by: Ricardo Cañuelo <ricardo.canuelo(a)collabora.com> Signed-off-by: Jeffle Xu <jefflexu(a)linux.alibaba.com> --- changes since v3: - make the check more fine-grained since we have the exact readahead window size now, as suggested by Ricardo Cañuelo chnages since v2: - add 'Reported-by' chnages since v1: - add the test name "mincore" in the subject line - add the error message in commit message - rename @filesize to @file_size to keep a more consistent naming convention --- .../selftests/mincore/mincore_selftest.c | 96 +++++++++++++------ 1 file changed, 68 insertions(+), 28 deletions(-) diff --git a/tools/testing/selftests/mincore/mincore_selftest.c b/tools/testing/selftests/mincore/mincore_selftest.c index 5a1e85ff5d32..369b35af4b4f 100644 --- a/tools/testing/selftests/mincore/mincore_selftest.c +++ b/tools/testing/selftests/mincore/mincore_selftest.c @@ -15,6 +15,11 @@ #include <string.h> #include <fcntl.h> #include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include <sys/sysmacros.h> +#include <sys/mount.h> #include "../kselftest.h" #include "../kselftest_harness.h" @@ -193,12 +198,44 @@ TEST(check_file_mmap) int retval; int page_size; int fd; - int i; + int i, start, end; int ra_pages = 0; + long ra_size, file_size; + struct stat stats; + dev_t devt; + unsigned int major, minor; + char devpath[32]; + + retval = stat(".", &stats); + ASSERT_EQ(0, retval) { + TH_LOG("Can't stat pwd: %s", strerror(errno)); + } + + devt = stats.st_dev; + major = major(devt); + minor = minor(devt); + snprintf(devpath, sizeof(devpath), "/dev/block/%u:%u", major, minor); + + fd = open(devpath, O_RDONLY); + ASSERT_NE(-1, fd) { + TH_LOG("Can't open underlying disk %s", strerror(errno)); + } + + retval = ioctl(fd, BLKRAGET, &ra_size); + ASSERT_EQ(0, retval) { + TH_LOG("Error ioctl with the underlying disk: %s", strerror(errno)); + } + + /* + * BLKRAGET ioctl returns the readahead size in sectors (512 bytes). + * Make file_size large enough to contain the readahead window. + */ + ra_size *= 512; + file_size = ra_size * 2; page_size = sysconf(_SC_PAGESIZE); - vec_size = FILE_SIZE / page_size; - if (FILE_SIZE % page_size) + vec_size = file_size / page_size; + if (file_size % page_size) vec_size++; vec = calloc(vec_size, sizeof(unsigned char)); @@ -213,7 +250,7 @@ TEST(check_file_mmap) strerror(errno)); } errno = 0; - retval = fallocate(fd, 0, 0, FILE_SIZE); + retval = fallocate(fd, 0, 0, file_size); ASSERT_EQ(0, retval) { TH_LOG("Error allocating space for the temporary file: %s", strerror(errno)); @@ -223,12 +260,12 @@ TEST(check_file_mmap) * Map the whole file, the pages shouldn't be fetched yet. */ errno = 0; - addr = mmap(NULL, FILE_SIZE, PROT_READ | PROT_WRITE, + addr = mmap(NULL, file_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); ASSERT_NE(MAP_FAILED, addr) { TH_LOG("mmap error: %s", strerror(errno)); } - retval = mincore(addr, FILE_SIZE, vec); + retval = mincore(addr, file_size, vec); ASSERT_EQ(0, retval); for (i = 0; i < vec_size; i++) { ASSERT_EQ(0, vec[i]) { @@ -240,38 +277,41 @@ TEST(check_file_mmap) * Touch a page in the middle of the mapping. We expect the next * few pages (the readahead window) to be populated too. */ - addr[FILE_SIZE / 2] = 1; - retval = mincore(addr, FILE_SIZE, vec); + addr[file_size / 2] = 1; + retval = mincore(addr, file_size, vec); ASSERT_EQ(0, retval); - ASSERT_EQ(1, vec[FILE_SIZE / 2 / page_size]) { - TH_LOG("Page not found in memory after use"); - } - i = FILE_SIZE / 2 / page_size + 1; - while (i < vec_size && vec[i]) { - ra_pages++; - i++; - } - EXPECT_GT(ra_pages, 0) { - TH_LOG("No read-ahead pages found in memory"); - } + /* + * Readahead window is [start, end). So far the sync readahead + * algorithm takes the page that triggers the page fault as the + * midpoint. + */ + ra_pages = ra_size / page_size; + start = file_size / 2 / page_size - ra_pages / 2; + end = start + ra_pages; - EXPECT_LT(i, vec_size) { - TH_LOG("Read-ahead pages reached the end of the file"); + /* + * Check there's no hole in the readahead window. + */ + for (i = start; i < end; i++) { + ASSERT_EQ(1, vec[i]) { + TH_LOG("Hole found in read-ahead window"); + } } + /* - * End of the readahead window. The rest of the pages shouldn't - * be in memory. + * Check there's no page beyond the readahead window. */ - if (i < vec_size) { - while (i < vec_size && !vec[i]) - i++; - EXPECT_EQ(vec_size, i) { + for (i = 0; i < vec_size; i++) { + if (i == start) + i = end; + + EXPECT_EQ(0, vec[i]) { TH_LOG("Unexpected page in memory beyond readahead window"); } } - munmap(addr, FILE_SIZE); + munmap(addr, file_size); close(fd); free(vec); } -- 2.27.0

4 years, 2 months

2
1
0 0

[PATCH] selftests/powerpc: remove unneeded semicolon

by Yang Li

Eliminate the following coccicheck warning: ./tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c:327:4-5: Unneeded semicolon Reported-by: Abaci Robot <abaci(a)linux.alibaba.com> Signed-off-by: Yang Li <yang.lee(a)linux.alibaba.com> --- tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c b/tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c index 02dffb6..b099753 100644 --- a/tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c +++ b/tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c @@ -324,7 +324,7 @@ int compress_file(int argc, char **argv, void *handle) fprintf(stderr, "error: cannot progress; "); fprintf(stderr, "too many faults\n"); exit(-1); - }; + } } fault_tries = NX_MAX_FAULTS; /* Reset for the next chunk */ -- 1.8.3.1

4 years, 2 months

2
1
0 0

[PATCH v3 0/4] powerpc/selftests: Add Power10 2nd DAWR selftests

by Ravi Bangoria

Power10 introduced 2nd watchpoint (DAWR). ISA 3.1, Book 3S, Ch 9 - 'Debug Facilities' covers the feature in detail. Kernel patches to enable the 2nd DAWR are already in[1], including kvm enablement[2]. These patches adds selftests for 2nd DAWR. [1]: https://git.kernel.org/torvalds/c/deb2bd9bcc8428d4b65b6ba640ba8b57c1b20b17 [2]: https://git.kernel.org/torvalds/c/bd1de1a0e6eff4bde5ceae969673b85b8446fd6a v2: https://lore.kernel.org/r/20210407054938.312857-1-ravi.bangoria@linux.ibm.c… v2->v3: - Fixed some checkpatch warnings v1: https://lore.kernel.org/r/20200723102058.312282-1-ravi.bangoria@linux.ibm.c… v1->v2: - Kvm patches are already upstream - Rebased selftests to powerpc/next Ravi Bangoria (4): powerpc/selftests/ptrace-hwbreak: Add testcases for 2nd DAWR powerpc/selftests/perf-hwbreak: Coalesce event creation code powerpc/selftests/perf-hwbreak: Add testcases for 2nd DAWR powerpc/selftests: Add selftest to test concurrent perf/ptrace events .../selftests/powerpc/ptrace/.gitignore | 1 + .../testing/selftests/powerpc/ptrace/Makefile | 2 +- .../selftests/powerpc/ptrace/perf-hwbreak.c | 631 +++++++++++++++-- .../selftests/powerpc/ptrace/ptrace-hwbreak.c | 79 +++ .../powerpc/ptrace/ptrace-perf-hwbreak.c | 659 ++++++++++++++++++ 5 files changed, 1330 insertions(+), 42 deletions(-) create mode 100644 tools/testing/selftests/powerpc/ptrace/ptrace-perf-hwbreak.c -- 2.27.0

4 years, 2 months

2
5
0 0

[RFC PATCH v2 0/2] x86/speculation: Add finer control for when to issue IBPB

by Anand K Mistry

It is documented in Documentation/admin-guide/hw-vuln/spectre.rst, that disabling indirect branch speculation for a user-space process creates more overhead and cause it to run slower. The performance hit varies by CPU, but on the AMD A4-9120C and A6-9220C CPUs, a simple ping-pong using pipes between two processes runs ~10x slower when disabling IB speculation. Patch 2, included in this RFC but not intended for commit, is a simple program that demonstrates this issue. Running on a A4-9120C without IB speculation disabled, each process ping-pong takes ~7us: localhost ~ # taskset 1 /usr/local/bin/test ... iters: 262144, t: 1936300, iter/sec: 135383, us/iter: 7 But when IB speculation is disabled, that number increases significantly: localhost ~ # taskset 1 /usr/local/bin/test d ... iters: 16384, t: 1500518, iter/sec: 10918, us/iter: 91 Although this test is a worst-case scenario, we can also consider a real situation: an audio server (i.e. pulse). If we imagine a low-latency capture, with 10ms packets and a concurrent task on the same CPU (i.e. video encoding, for a video call), the audio server will preempt the CPU at a rate of 100HZ. At 91us overhead per preemption (switching to and from the audio process), that's 0.9% overhead for one process doing preemption. In real-world testing (on a A4-9120C), I've seen 9% of CPU used by IBPB when doing a 2-person video call. With this patch, the number of IBPBs issued can be reduced to the minimum necessary, only when there's a potential attacker->victim process switch. Running on the same A4-9120C device, this patch reduces the performance hit of IBPB by ~half, as expected: localhost ~ # taskset 1 /usr/local/bin/test ds ... iters: 32768, t: 1824043, iter/sec: 17964, us/iter: 55 It should be noted, CPUs from multiple vendors experience a performance hit due to IBPB. I also tested a Intel i3-8130U which sees a noticable (~2x) increase in process switch time due to IBPB. IB spec enabled: localhost ~ # taskset 1 /usr/local/bin/test ... iters: 262144, t: 1210821us, iter/sec: 216501, us/iter: 4 IB spec disabled: localhost ~ # taskset 1 /usr/local/bin/test d ... iters: 131072, t: 1257583us, iter/sec: 104225, us/iter: 9 Open questions: - There are a significant number of task flags, which also now reaches the limit of the 'long' on 32-bit systems. Should the 'mode' flags be stored somewhere else? - Having x86-specific flags in linux/sched.h feels wrong. However, this is the mechanism for doing atomic flag updates. Is there an alternate approach? Open tasks: - Documentation - Naming Changes in v2: - Make flag per-process using prctl(). Anand K Mistry (2): x86/speculation: Allow per-process control of when to issue IBPB selftests: Benchmark for the cost of disabling IB speculation arch/x86/include/asm/thread_info.h | 4 + arch/x86/kernel/cpu/bugs.c | 56 +++++++++ arch/x86/kernel/process.c | 10 ++ arch/x86/mm/tlb.c | 51 ++++++-- include/linux/sched.h | 10 ++ include/uapi/linux/prctl.h | 5 + .../testing/selftests/ib_spec/ib_spec_bench.c | 109 ++++++++++++++++++ 7 files changed, 236 insertions(+), 9 deletions(-) create mode 100644 tools/testing/selftests/ib_spec/ib_spec_bench.c -- 2.31.1.498.g6c1eba8ee3d-goog

4 years, 2 months

1
1
0 0

Running kunit_tool on unclean trees

by Marcelo Schmitt

Hi, a friend and I were chasing bug 205219 [1] listed in Bugzilla. We step into something a little bit different when trying to reproduce the buggy behavior. In our try, compilation failed with a message form make asking us to clean the source tree. We couldn't run kunit_tool after compiling the kernel for x86, as described by Ted in the discussion pointed out by the bug report. Steps to reproduce: 0) Run kunit_tool $ ./tools/testing/kunit/kunit.py run Works fine with a clean tree. 1) Compile the kernel for some architecture (we did it for x86_64). 2) Run kunit_tool again $ ./tools/testing/kunit/kunit.py run Fails with a message form make asking us to clean the source tree. Removing the clean source tree check from the top-level Makefile gives us a similar error to what was described in the bug report. We see that after running `git clean -fdx` kunit_tool runs nicely again. However, this is not a real solution since some kernel binaries are erased by git. We also had a look into the commit messages of Masahiro Yamada but couldn't quite grasp why the check for the tree to be clean was added. We could invest more time in this issue but actually don't know how to proceed. We'd be glad to receive any comment about it. We could also try something else if it's a too hard issue for beginners. [1]: https://bugzilla.kernel.org/show_bug.cgi?id=205219 Best Regards, Marcelo

4 years, 2 months

3
3
0 0

[PATCH v3] KVM: x86: Fix KVM_GET_CPUID2 ioctl to return cpuid entries count

by Valeriy Vdovin

KVM_GET_CPUID2 kvm ioctl is not very well documented, but the way it is implemented in function kvm_vcpu_ioctl_get_cpuid2 suggests that even at error path it will try to return number of entries to the caller. But The dispatcher kvm vcpu ioctl dispatcher code in kvm_arch_vcpu_ioctl ignores any output from this function if it sees the error return code. It's very explicit by the code that it was designed to receive some small number of entries to return E2BIG along with the corrected number. This lost logic in the dispatcher code has been restored by removing the lines that check for function return code and skip if error is found. Without it, the ioctl caller will see both the number of entries and the correct error. In selftests relevant function vcpu_get_cpuid has also been modified to utilize the number of cpuid entries returned along with errno E2BIG. Signed-off-by: Valeriy Vdovin <valeriy.vdovin(a)virtuozzo.com> --- v2: - Added description to documentation of KVM_GET_CPUID2. - Copy back nent only if E2BIG is returned. - Fixed error code sign. Documentation/virt/kvm/api.rst | 81 ++++++++++++------- arch/x86/kvm/x86.c | 11 ++- .../selftests/kvm/lib/x86_64/processor.c | 20 +++-- 3 files changed, 73 insertions(+), 39 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 245d80581f15..c7cfe4b9614e 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -711,7 +711,34 @@ resulting CPUID configuration through KVM_GET_CPUID2 in case. }; -4.21 KVM_SET_SIGNAL_MASK +4.21 KVM_GET_CPUID2 +------------------ + +:Capability: basic +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_cpuid (in/out) +:Returns: 0 on success, -1 on error + +Returns a full list of cpuid entries that are supported by this vcpu and were +previously set by KVM_SET_CPUID/KVM_SET_CPUID2. + +The userspace must specify the number of cpuid entries it is ready to accept +from the kernel in the 'nent' field of 'struct kmv_cpuid'. + +The kernel will try to return all the cpuid entries it has in the response. +If the userspace nent value is too small for the full response, the kernel will +set the error code to -E2BIG, set the same 'nent' field to the actual number of +cpuid_entries and return without writing back any entries to the userspace. +The userspace can thus implement a two-call sequence, where the first call is +made with nent set to 0 to read the number of entries from the kernel and +use this response to allocate enough memory for a full response for the second +call. + +The call cal also return with error code -EFAULT in case of other errors. + + +4.22 KVM_SET_SIGNAL_MASK ------------------------ :Capability: basic @@ -737,7 +764,7 @@ signal mask. }; -4.22 KVM_GET_FPU +4.23 KVM_GET_FPU ---------------- :Capability: basic @@ -766,7 +793,7 @@ Reads the floating point state from the vcpu. }; -4.23 KVM_SET_FPU +4.24 KVM_SET_FPU ---------------- :Capability: basic @@ -795,7 +822,7 @@ Writes the floating point state to the vcpu. }; -4.24 KVM_CREATE_IRQCHIP +4.25 KVM_CREATE_IRQCHIP ----------------------- :Capability: KVM_CAP_IRQCHIP, KVM_CAP_S390_IRQCHIP (s390) @@ -817,7 +844,7 @@ Note that on s390 the KVM_CAP_S390_IRQCHIP vm capability needs to be enabled before KVM_CREATE_IRQCHIP can be used. -4.25 KVM_IRQ_LINE +4.26 KVM_IRQ_LINE ----------------- :Capability: KVM_CAP_IRQCHIP @@ -886,7 +913,7 @@ be used for a userspace interrupt controller. }; -4.26 KVM_GET_IRQCHIP +4.27 KVM_GET_IRQCHIP -------------------- :Capability: KVM_CAP_IRQCHIP @@ -911,7 +938,7 @@ KVM_CREATE_IRQCHIP into a buffer provided by the caller. }; -4.27 KVM_SET_IRQCHIP +4.28 KVM_SET_IRQCHIP -------------------- :Capability: KVM_CAP_IRQCHIP @@ -936,7 +963,7 @@ KVM_CREATE_IRQCHIP from a buffer provided by the caller. }; -4.28 KVM_XEN_HVM_CONFIG +4.29 KVM_XEN_HVM_CONFIG ----------------------- :Capability: KVM_CAP_XEN_HVM @@ -972,7 +999,7 @@ fields must be zero. No other flags are currently valid in the struct kvm_xen_hvm_config. -4.29 KVM_GET_CLOCK +4.30 KVM_GET_CLOCK ------------------ :Capability: KVM_CAP_ADJUST_CLOCK @@ -1005,7 +1032,7 @@ TSC is not stable. }; -4.30 KVM_SET_CLOCK +4.31 KVM_SET_CLOCK ------------------ :Capability: KVM_CAP_ADJUST_CLOCK @@ -1027,7 +1054,7 @@ such as migration. }; -4.31 KVM_GET_VCPU_EVENTS +4.32 KVM_GET_VCPU_EVENTS ------------------------ :Capability: KVM_CAP_VCPU_EVENTS @@ -1146,7 +1173,7 @@ directly to the virtual CPU). __u32 reserved[12]; }; -4.32 KVM_SET_VCPU_EVENTS +4.33 KVM_SET_VCPU_EVENTS ------------------------ :Capability: KVM_CAP_VCPU_EVENTS @@ -1209,7 +1236,7 @@ exceptions by manipulating individual registers using the KVM_SET_ONE_REG API. See KVM_GET_VCPU_EVENTS for the data structure. -4.33 KVM_GET_DEBUGREGS +4.34 KVM_GET_DEBUGREGS ---------------------- :Capability: KVM_CAP_DEBUGREGS @@ -1231,7 +1258,7 @@ Reads debug registers from the vcpu. }; -4.34 KVM_SET_DEBUGREGS +4.35 KVM_SET_DEBUGREGS ---------------------- :Capability: KVM_CAP_DEBUGREGS @@ -1246,7 +1273,7 @@ See KVM_GET_DEBUGREGS for the data structure. The flags field is unused yet and must be cleared on entry. -4.35 KVM_SET_USER_MEMORY_REGION +4.36 KVM_SET_USER_MEMORY_REGION ------------------------------- :Capability: KVM_CAP_USER_MEMORY @@ -1315,7 +1342,7 @@ The KVM_SET_MEMORY_REGION does not allow fine grained control over memory allocation and is deprecated. -4.36 KVM_SET_TSS_ADDR +4.37 KVM_SET_TSS_ADDR --------------------- :Capability: KVM_CAP_SET_TSS_ADDR @@ -1335,7 +1362,7 @@ because of a quirk in the virtualization implementation (see the internals documentation when it pops into existence). -4.37 KVM_ENABLE_CAP +4.38 KVM_ENABLE_CAP ------------------- :Capability: KVM_CAP_ENABLE_CAP @@ -1390,7 +1417,7 @@ function properly, this is the place to put them. The vcpu ioctl should be used for vcpu-specific capabilities, the vm ioctl for vm-wide capabilities. -4.38 KVM_GET_MP_STATE +4.39 KVM_GET_MP_STATE --------------------- :Capability: KVM_CAP_MP_STATE @@ -1438,7 +1465,7 @@ For arm/arm64: The only states that are valid are KVM_MP_STATE_STOPPED and KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not. -4.39 KVM_SET_MP_STATE +4.40 KVM_SET_MP_STATE --------------------- :Capability: KVM_CAP_MP_STATE @@ -1460,7 +1487,7 @@ For arm/arm64: The only states that are valid are KVM_MP_STATE_STOPPED and KVM_MP_STATE_RUNNABLE which reflect if the vcpu should be paused or not. -4.40 KVM_SET_IDENTITY_MAP_ADDR +4.41 KVM_SET_IDENTITY_MAP_ADDR ------------------------------ :Capability: KVM_CAP_SET_IDENTITY_MAP_ADDR @@ -1484,7 +1511,7 @@ documentation when it pops into existence). Fails if any VCPU has already been created. -4.41 KVM_SET_BOOT_CPU_ID +4.42 KVM_SET_BOOT_CPU_ID ------------------------ :Capability: KVM_CAP_SET_BOOT_CPU_ID @@ -1499,7 +1526,7 @@ is vcpu 0. This ioctl has to be called before vcpu creation, otherwise it will return EBUSY error. -4.42 KVM_GET_XSAVE +4.43 KVM_GET_XSAVE ------------------ :Capability: KVM_CAP_XSAVE @@ -1518,7 +1545,7 @@ otherwise it will return EBUSY error. This ioctl would copy current vcpu's xsave struct to the userspace. -4.43 KVM_SET_XSAVE +4.44 KVM_SET_XSAVE ------------------ :Capability: KVM_CAP_XSAVE @@ -1537,7 +1564,7 @@ This ioctl would copy current vcpu's xsave struct to the userspace. This ioctl would copy userspace's xsave struct to the kernel. -4.44 KVM_GET_XCRS +4.45 KVM_GET_XCRS ----------------- :Capability: KVM_CAP_XCRS @@ -1564,7 +1591,7 @@ This ioctl would copy userspace's xsave struct to the kernel. This ioctl would copy current vcpu's xcrs to the userspace. -4.45 KVM_SET_XCRS +4.46 KVM_SET_XCRS ----------------- :Capability: KVM_CAP_XCRS @@ -1591,7 +1618,7 @@ This ioctl would copy current vcpu's xcrs to the userspace. This ioctl would set vcpu's xcr to the value userspace specified. -4.46 KVM_GET_SUPPORTED_CPUID +4.47 KVM_GET_SUPPORTED_CPUID ---------------------------- :Capability: KVM_CAP_EXT_CPUID @@ -1676,7 +1703,7 @@ if that returns true and you use KVM_CREATE_IRQCHIP, or if you emulate the feature in userspace, then you can enable the feature for KVM_SET_CPUID2. -4.47 KVM_PPC_GET_PVINFO +4.48 KVM_PPC_GET_PVINFO ----------------------- :Capability: KVM_CAP_PPC_GET_PVINFO diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index efc7a82ab140..3f941b1f4e78 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4773,14 +4773,17 @@ long kvm_arch_vcpu_ioctl(struct file *filp, r = -EFAULT; if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) goto out; + r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, cpuid_arg->entries); - if (r) + + if (r && r != -E2BIG) goto out; - r = -EFAULT; - if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) + + if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) { + r = -EFAULT; goto out; - r = 0; + } break; } case KVM_GET_MSRS: { diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index a8906e60a108..a412b39ad791 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -727,17 +727,21 @@ struct kvm_cpuid2 *vcpu_get_cpuid(struct kvm_vm *vm, uint32_t vcpuid) cpuid = allocate_kvm_cpuid2(); max_ent = cpuid->nent; + cpuid->nent = 0; - for (cpuid->nent = 1; cpuid->nent <= max_ent; cpuid->nent++) { - rc = ioctl(vcpu->fd, KVM_GET_CPUID2, cpuid); - if (!rc) - break; + rc = ioctl(vcpu->fd, KVM_GET_CPUID2, cpuid); + TEST_ASSERT(rc == -1 && errno == E2BIG, + "KVM_GET_CPUID2 should return E2BIG: %d %d", + rc, errno); - TEST_ASSERT(rc == -1 && errno == E2BIG, - "KVM_GET_CPUID2 should either succeed or give E2BIG: %d %d", - rc, errno); - } + TEST_ASSERT(cpuid->nent, + "KVM_GET_CPUID2 failed to set cpuid->nent with E2BIG"); + + TEST_ASSERT(cpuid->nent < max_ent, + "KVM_GET_CPUID2 has %d entries, expected maximum: %d", + cpuid->nent, max_ent); + rc = ioctl(vcpu->fd, KVM_GET_CPUID2, cpuid); TEST_ASSERT(rc == 0, "KVM_GET_CPUID2 failed, rc: %i errno: %i", rc, errno); -- 2.17.1

4 years, 2 months

1
0
0 0

[PATCH v2] KVM: x86: Fix KVM_GET_CPUID2 ioctl to return cpuid entries count

by Valeriy Vdovin

KVM_GET_CPUID2 kvm ioctl is not very well documented, but the way it is implemented in function kvm_vcpu_ioctl_get_cpuid2 suggests that even at error path it will try to return number of entries to the caller. But The dispatcher kvm vcpu ioctl dispatcher code in kvm_arch_vcpu_ioctl ignores any output from this function if it sees the error return code. It's very explicit by the code that it was designed to receive some small number of entries to return E2BIG along with the corrected number. This lost logic in the dispatcher code has been restored by removing the lines that check for function return code and skip if error is found. Without it, the ioctl caller will see both the number of entries and the correct error. In selftests relevant function vcpu_get_cpuid has also been modified to utilize the number of cpuid entries returned along with errno E2BIG. Signed-off-by: Valeriy Vdovin <valeriy.vdovin(a)virtuozzo.com> --- v2: - Added description to documentation of KVM_GET_CPUID2. - Copy back nent only if E2BIG is returned. Documentation/virt/kvm/api.rst | 81 ++++++++++++------- arch/x86/kvm/x86.c | 11 ++- .../selftests/kvm/lib/x86_64/processor.c | 20 +++-- 3 files changed, 73 insertions(+), 39 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 245d80581f15..c7cfe4b9614e 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -711,7 +711,34 @@ resulting CPUID configuration through KVM_GET_CPUID2 in case. }; -4.21 KVM_SET_SIGNAL_MASK +4.21 KVM_GET_CPUID2 +------------------ + +:Capability: basic +:Architectures: x86 +:Type: vcpu ioctl +:Parameters: struct kvm_cpuid (in/out) +:Returns: 0 on success, -1 on error + +Returns a full list of cpuid entries that are supported by this vcpu and were +previously set by KVM_SET_CPUID/KVM_SET_CPUID2. + +The userspace must specify the number of cpuid entries it is ready to accept +from the kernel in the 'nent' field of 'struct kmv_cpuid'. + +The kernel will try to return all the cpuid entries it has in the response. +If the userspace nent value is too small for the full response, the kernel will +set the error code to -E2BIG, set the same 'nent' field to the actual number of +cpuid_entries and return without writing back any entries to the userspace. +The userspace can thus implement a two-call sequence, where the first call is +made with nent set to 0 to read the number of entries from the kernel and +use this response to allocate enough memory for a full response for the second +call. + +The call cal also return with error code -EFAULT in case of other errors. + + +4.22 KVM_SET_SIGNAL_MASK ------------------------ :Capability: basic @@ -737,7 +764,7 @@ signal mask. }; -4.22 KVM_GET_FPU +4.23 KVM_GET_FPU ---------------- :Capability: basic @@ -766,7 +793,7 @@ Reads the floating point state from the vcpu. }; -4.23 KVM_SET_FPU +4.24 KVM_SET_FPU ---------------- :Capability: basic @@ -795,7 +822,7 @@ Writes the floating point state to the vcpu. }; -4.24 KVM_CREATE_IRQCHIP +4.25 KVM_CREATE_IRQCHIP ----------------------- :Capability: KVM_CAP_IRQCHIP, KVM_CAP_S390_IRQCHIP (s390) @@ -817,7 +844,7 @@ Note that on s390 the KVM_CAP_S390_IRQCHIP vm capability needs to be enabled before KVM_CREATE_IRQCHIP can be used. -4.25 KVM_IRQ_LINE +4.26 KVM_IRQ_LINE ----------------- :Capability: KVM_CAP_IRQCHIP @@ -886,7 +913,7 @@ be used for a userspace interrupt controller. }; -4.26 KVM_GET_IRQCHIP +4.27 KVM_GET_IRQCHIP -------------------- :Capability: KVM_CAP_IRQCHIP @@ -911,7 +938,7 @@ KVM_CREATE_IRQCHIP into a buffer provided by the caller. }; -4.27 KVM_SET_IRQCHIP +4.28 KVM_SET_IRQCHIP -------------------- :Capability: KVM_CAP_IRQCHIP @@ -936,7 +963,7 @@ KVM_CREATE_IRQCHIP from a buffer provided by the caller. }; -4.28 KVM_XEN_HVM_CONFIG +4.29 KVM_XEN_HVM_CONFIG ----------------------- :Capability: KVM_CAP_XEN_HVM @@ -972,7 +999,7 @@ fields must be zero. No other flags are currently valid in the struct kvm_xen_hvm_config. -4.29 KVM_GET_CLOCK +4.30 KVM_GET_CLOCK ------------------ :Capability: KVM_CAP_ADJUST_CLOCK @@ -1005,7 +1032,7 @@ TSC is not stable. }; -4.30 KVM_SET_CLOCK +4.31 KVM_SET_CLOCK ------------------ :Capability: KVM_CAP_ADJUST_CLOCK @@ -1027,7 +1054,7 @@ such as migration. }; -4.31 KVM_GET_VCPU_EVENTS +4.32 KVM_GET_VCPU_EVENTS ------------------------ :Capability: KVM_CAP_VCPU_EVENTS @@ -1146,7 +1173,7 @@ directly to the virtual CPU). __u32 reserved[12]; }; -4.32 KVM_SET_VCPU_EVENTS +4.33 KVM_SET_VCPU_EVENTS ------------------------ :Capability: KVM_CAP_VCPU_EVENTS @@ -1209,7 +1236,7 @@ exceptions by manipulating individual registers using the KVM_SET_ONE_REG API. See KVM_GET_VCPU_EVENTS for the data structure. -4.33 KVM_GET_DEBUGREGS +4.34 KVM_GET_DEBUGREGS ---------------------- :Capability: KVM_CAP_DEBUGREGS @@ -1231,7 +1258,7 @@ Reads debug registers from the vcpu. }; -4.34 KVM_SET_DEBUGREGS +4.35 KVM_SET_DEBUGREGS ---------------------- :Capability: KVM_CAP_DEBUGREGS @@ -1246,7 +1273,7 @@ See KVM_GET_DEBUGREGS for the data structure. The flags field is unused yet and must be cleared on entry. -4.35 KVM_SET_USER_MEMORY_REGION +4.36 KVM_SET_USER_MEMORY_REGION ------------------------------- :Capability: KVM_CAP_USER_MEMORY @@ -1315,7 +1342,7 @@ The KVM_SET_MEMORY_REGION does not allow fine grained control over memory allocation and is deprecated. -4.36 KVM_SET_TSS_ADDR +4.37 KVM_SET_TSS_ADDR --------------------- :Capability: KVM_CAP_SET_TSS_ADDR @@ -1335,7 +1362,7 @@ because of a quirk in the virtualization implementation (see the internals documentation when it pops into existence). -4.37 KVM_ENABLE_CAP +4.38 KVM_ENABLE_CAP ------------------- :Capability: KVM_CAP_ENABLE_CAP @@ -1390,7 +1417,7 @@ function properly, this is the place to put them. The vcpu ioctl should be used for vcpu-specific capabilities, the vm ioctl for vm-wide capabilities. -4.38 KVM_GET_MP_STATE +4.39 KVM_GET_MP_STATE --------------------- :Capability: KVM_CAP_MP_STATE @@ -1438,7 +1465,7 @@ For arm/arm64: The only states that are valid are KVM_MP_STATE_STOPPED and KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not. -4.39 KVM_SET_MP_STATE +4.40 KVM_SET_MP_STATE --------------------- :Capability: KVM_CAP_MP_STATE @@ -1460,7 +1487,7 @@ For arm/arm64: The only states that are valid are KVM_MP_STATE_STOPPED and KVM_MP_STATE_RUNNABLE which reflect if the vcpu should be paused or not. -4.40 KVM_SET_IDENTITY_MAP_ADDR +4.41 KVM_SET_IDENTITY_MAP_ADDR ------------------------------ :Capability: KVM_CAP_SET_IDENTITY_MAP_ADDR @@ -1484,7 +1511,7 @@ documentation when it pops into existence). Fails if any VCPU has already been created. -4.41 KVM_SET_BOOT_CPU_ID +4.42 KVM_SET_BOOT_CPU_ID ------------------------ :Capability: KVM_CAP_SET_BOOT_CPU_ID @@ -1499,7 +1526,7 @@ is vcpu 0. This ioctl has to be called before vcpu creation, otherwise it will return EBUSY error. -4.42 KVM_GET_XSAVE +4.43 KVM_GET_XSAVE ------------------ :Capability: KVM_CAP_XSAVE @@ -1518,7 +1545,7 @@ otherwise it will return EBUSY error. This ioctl would copy current vcpu's xsave struct to the userspace. -4.43 KVM_SET_XSAVE +4.44 KVM_SET_XSAVE ------------------ :Capability: KVM_CAP_XSAVE @@ -1537,7 +1564,7 @@ This ioctl would copy current vcpu's xsave struct to the userspace. This ioctl would copy userspace's xsave struct to the kernel. -4.44 KVM_GET_XCRS +4.45 KVM_GET_XCRS ----------------- :Capability: KVM_CAP_XCRS @@ -1564,7 +1591,7 @@ This ioctl would copy userspace's xsave struct to the kernel. This ioctl would copy current vcpu's xcrs to the userspace. -4.45 KVM_SET_XCRS +4.46 KVM_SET_XCRS ----------------- :Capability: KVM_CAP_XCRS @@ -1591,7 +1618,7 @@ This ioctl would copy current vcpu's xcrs to the userspace. This ioctl would set vcpu's xcr to the value userspace specified. -4.46 KVM_GET_SUPPORTED_CPUID +4.47 KVM_GET_SUPPORTED_CPUID ---------------------------- :Capability: KVM_CAP_EXT_CPUID @@ -1676,7 +1703,7 @@ if that returns true and you use KVM_CREATE_IRQCHIP, or if you emulate the feature in userspace, then you can enable the feature for KVM_SET_CPUID2. -4.47 KVM_PPC_GET_PVINFO +4.48 KVM_PPC_GET_PVINFO ----------------------- :Capability: KVM_CAP_PPC_GET_PVINFO diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index efc7a82ab140..fa9bb6b751c6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4773,14 +4773,17 @@ long kvm_arch_vcpu_ioctl(struct file *filp, r = -EFAULT; if (copy_from_user(&cpuid, cpuid_arg, sizeof(cpuid))) goto out; + r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, cpuid_arg->entries); - if (r) + + if (r && r != E2BIG) goto out; - r = -EFAULT; - if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) + + if (copy_to_user(cpuid_arg, &cpuid, sizeof(cpuid))) { + r = -EFAULT; goto out; - r = 0; + } break; } case KVM_GET_MSRS: { diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index a8906e60a108..a412b39ad791 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -727,17 +727,21 @@ struct kvm_cpuid2 *vcpu_get_cpuid(struct kvm_vm *vm, uint32_t vcpuid) cpuid = allocate_kvm_cpuid2(); max_ent = cpuid->nent; + cpuid->nent = 0; - for (cpuid->nent = 1; cpuid->nent <= max_ent; cpuid->nent++) { - rc = ioctl(vcpu->fd, KVM_GET_CPUID2, cpuid); - if (!rc) - break; + rc = ioctl(vcpu->fd, KVM_GET_CPUID2, cpuid); + TEST_ASSERT(rc == -1 && errno == E2BIG, + "KVM_GET_CPUID2 should return E2BIG: %d %d", + rc, errno); - TEST_ASSERT(rc == -1 && errno == E2BIG, - "KVM_GET_CPUID2 should either succeed or give E2BIG: %d %d", - rc, errno); - } + TEST_ASSERT(cpuid->nent, + "KVM_GET_CPUID2 failed to set cpuid->nent with E2BIG"); + + TEST_ASSERT(cpuid->nent < max_ent, + "KVM_GET_CPUID2 has %d entries, expected maximum: %d", + cpuid->nent, max_ent); + rc = ioctl(vcpu->fd, KVM_GET_CPUID2, cpuid); TEST_ASSERT(rc == 0, "KVM_GET_CPUID2 failed, rc: %i errno: %i", rc, errno); -- 2.17.1

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