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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: rientjes@google.com, seanjc@google.com, ackerleytng@google.com, vannapurve@google.com, michael.roth@amd.com, jiaqiyan@google.com, tabba@google.com, dave.hansen@linux.intel.com, Lisa Wang Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Add a shmem memory failure selftest to test the shmem memory failure is correct after modifying shmem return value. Test that + madvise() call returns 0 at the first time + trigger a SIGBUS when the poisoned shmem page is fault-in again. Signed-off-by: Lisa Wang --- tools/testing/selftests/mm/Makefile | 3 + tools/testing/selftests/mm/run_vmtests.sh | 1 + .../selftests/mm/shmem_memory_failure_test.c | 98 ++++++++++++++++++= ++++ 3 files changed, 102 insertions(+) diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/= mm/Makefile index 7a5de4e9bf52..ac033851c9eb 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -72,6 +72,7 @@ TEST_GEN_FILES +=3D madv_populate TEST_GEN_FILES +=3D map_fixed_noreplace TEST_GEN_FILES +=3D map_hugetlb TEST_GEN_FILES +=3D map_populate +TEST_GEN_FILES +=3D shmem_memory_failure_test ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64 loongarch32 loonga= rch64)) TEST_GEN_FILES +=3D memfd_secret endif @@ -259,6 +260,8 @@ $(OUTPUT)/migration: LDLIBS +=3D -lnuma =20 $(OUTPUT)/rmap: LDLIBS +=3D -lnuma =20 +$(OUTPUT)/shmem_memory_failure_test: CFLAGS +=3D -I$(top_srcdir)/tools/inc= lude + local_config.mk local_config.h: check_config.sh CC=3D"$(CC)" CFLAGS=3D"$(CFLAGS)" ./check_config.sh =20 diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/self= tests/mm/run_vmtests.sh index afdcfd0d7cef..58fb959a7936 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -402,6 +402,7 @@ CATEGORY=3D"hugetlb" run_test ./hugetlb-soft-offline echo "$nr_hugepages_tmp" > /proc/sys/vm/nr_hugepages echo "$enable_soft_offline" > /proc/sys/vm/enable_soft_offline CATEGORY=3D"hugetlb" run_test ./hugetlb-read-hwpoison +CATEGORY=3D"mmap" run_test ./shmem_memory_failure_test fi =20 if [ $VADDR64 -ne 0 ]; then diff --git a/tools/testing/selftests/mm/shmem_memory_failure_test.c b/tools= /testing/selftests/mm/shmem_memory_failure_test.c new file mode 100644 index 000000000000..44752024a7fc --- /dev/null +++ b/tools/testing/selftests/mm/shmem_memory_failure_test.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This test makes sure when memory failure happens, shmem can handle + * successfully. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "kselftest.h" +#include "vm_util.h" + +static sigjmp_buf sigbuf; + +static void signal_handler(int sig, siginfo_t *info, void *ucontext) +{ + siglongjmp(sigbuf, 1); +} + +static void set_signal_handler(int sig, void (*handler)(int, siginfo_t *, = void *)) +{ + struct sigaction sa =3D {}; + + sa.sa_sigaction =3D handler; + sa.sa_flags =3D SA_SIGINFO; + sigemptyset(&sa.sa_mask); + if (sigaction(sig, &sa, NULL) =3D=3D -1) + ksft_exit_fail_msg("Failed to set SIGBUS handler: %s\n", strerror(errno)= ); +} + +static unsigned long addr_to_pfn(char *addr) +{ + int pagemap_fd; + unsigned long pfn; + + pagemap_fd =3D open("/proc/self/pagemap", O_RDONLY); + if (pagemap_fd < 0) + ksft_exit_fail_msg("Failed to open /proc/self/pagemap: %s\n", strerror(e= rrno)); + pfn =3D pagemap_get_pfn(pagemap_fd, addr); + close(pagemap_fd); + + return pfn; +} + +static void test_shmem_memory_failure(size_t total_size, size_t page_size) +{ + unsigned long memory_failure_pfn; + char *memory_failure_mem; + char *memory_failure_addr; + int fd; + + fd =3D memfd_create("shmem_hwpoison_test", 0); + if (fd < 0) + ksft_exit_skip("memfd_create failed: %s\n", strerror(errno)); + + if (ftruncate(fd, total_size) < 0) + ksft_exit_fail_msg("ftruncate failed: %s\n", strerror(errno)); + + memory_failure_mem =3D mmap(NULL, total_size, PROT_READ | PROT_WRITE, MAP= _SHARED, fd, 0); + if (memory_failure_mem =3D=3D MAP_FAILED) + ksft_exit_fail_msg("mmap failed: %s\n", strerror(errno)); + memory_failure_addr =3D memory_failure_mem + page_size; + READ_ONCE(memory_failure_addr[0]); + memory_failure_pfn =3D addr_to_pfn(memory_failure_addr); + + if (madvise(memory_failure_addr, page_size, MADV_HWPOISON) !=3D 0) + ksft_exit_fail_msg("MADV_HWPOISON failed: %s\n", strerror(errno)); + + if (sigsetjmp(sigbuf, 1) =3D=3D 0) { + READ_ONCE(memory_failure_addr[0]); + ksft_test_result_fail("Read from poisoned page should have triggered SIG= BUS\n"); + } else { + ksft_test_result_pass("SIGBUS triggered as expected on poisoned page\n"); + } + + munmap(memory_failure_mem, total_size); + close(fd); + if (unpoison_memory(memory_failure_pfn) < 0) + ksft_exit_fail_msg("unpoison_memory failed: %s\n", strerror(errno)); +} + +int main(int argc, char *argv[]) +{ + const size_t pagesize =3D getpagesize(); + + ksft_print_header(); + ksft_set_plan(1); + + set_signal_handler(SIGBUS, signal_handler); + test_shmem_memory_failure(pagesize * 4, pagesize); + ksft_finished(); +} --=20 2.53.0.959.g497ff81fa9-goog