From patchwork Mon Aug 2 04:00:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pengfei Xu X-Patchwork-Id: 12413249 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 82412C4320A for ; Mon, 2 Aug 2021 04:01:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5996E610A8 for ; Mon, 2 Aug 2021 04:01:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231441AbhHBEBL (ORCPT ); Mon, 2 Aug 2021 00:01:11 -0400 Received: from mga17.intel.com ([192.55.52.151]:8832 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231410AbhHBEBK (ORCPT ); Mon, 2 Aug 2021 00:01:10 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10063"; a="193660645" X-IronPort-AV: E=Sophos;i="5.84,287,1620716400"; d="scan'208";a="193660645" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Aug 2021 21:01:02 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,287,1620716400"; d="scan'208";a="668971411" Received: from fedora29.sh.intel.com ([10.239.182.87]) by fmsmga005.fm.intel.com with ESMTP; 01 Aug 2021 21:00:59 -0700 From: Pengfei Xu To: Shuah Khan , linux-kselftest , linux-kernel Cc: Pengfei Xu , Heng Su , Yu Yu-cheng , Yu Fenghua , Hansen Dave , Luck Tony , Mehta Sohil , Chen Yu C Subject: [RFC PATCH v2 2/2] selftests/xsave: add xsave test during and after signal handling Date: Mon, 2 Aug 2021 12:00:04 +0800 Message-Id: <672a1d26af50d7413d0cb02eb1685878ede0a535.1627457824.git.pengfei.xu@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org In order to ensure that process XSAVE content is not affected by signal handling, this case tests process XSAVE content should not change in nested signal handling, and the XSAVE content should same before and after signal handling. Signed-off-by: Pengfei Xu --- tools/testing/selftests/xsave/.gitignore | 1 + tools/testing/selftests/xsave/Makefile | 2 +- .../selftests/xsave/xsave_signal_handle.c | 184 ++++++++++++++++++ 3 files changed, 186 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/xsave/xsave_signal_handle.c diff --git a/tools/testing/selftests/xsave/.gitignore b/tools/testing/selftests/xsave/.gitignore index 00b9970360c4..b448d36186f3 100644 --- a/tools/testing/selftests/xsave/.gitignore +++ b/tools/testing/selftests/xsave/.gitignore @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0-only xsave_instruction +xsave_signal_handle diff --git a/tools/testing/selftests/xsave/Makefile b/tools/testing/selftests/xsave/Makefile index dafdb0abdeb3..fedae2778297 100644 --- a/tools/testing/selftests/xsave/Makefile +++ b/tools/testing/selftests/xsave/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0-only CFLAGS := -g -Wall -mxsave -O2 -TEST_GEN_PROGS := xsave_instruction +TEST_GEN_PROGS := xsave_instruction xsave_signal_handle include ../lib.mk diff --git a/tools/testing/selftests/xsave/xsave_signal_handle.c b/tools/testing/selftests/xsave/xsave_signal_handle.c new file mode 100644 index 000000000000..0afcba3a1bd5 --- /dev/null +++ b/tools/testing/selftests/xsave/xsave_signal_handle.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * It's for xsave/xrstor during signal handling tests + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../kselftest.h" +#include "xsave_common.h" + +static unsigned char *xsave_buf0, *xsave_buf1, *xsave_buf2, *xsave_buf3; +static int result[2]; + +static void change_fpu_content(uint32_t ui32_random, double flt) +{ + asm volatile ("fldl %0" : : "m" (flt)); + asm volatile ("vbroadcastss %0, %%ymm0" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm1" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm2" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm3" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm4" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm5" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm6" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm7" : : "m" (ui32_random)); + #ifndef __i386__ + asm volatile ("vbroadcastss %0, %%ymm8" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm9" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm10" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm11" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm12" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm13" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm14" : : "m" (ui32_random)); + asm volatile ("vbroadcastss %0, %%ymm15" : : "m" (ui32_random)); + #endif +} + +static void usr1_handler(int signum, siginfo_t *info, void *__ctxp) +{ + uint32_t ui32_random; + double flt; + int xsave_size; + const char *test_name = "Child XSAVE should not change in nested signal"; + + ui32_random = rand(); + flt = ui32_random/10000.0; + if (signum == SIGUSR1) { + ksft_print_msg("SIGUSR1:0x%x changed fld:%f & ymm0-15:0x%x\n", + SIGUSR1, flt, ui32_random); + change_fpu_content(ui32_random, flt); + } + xsave_size = get_xsave_size(); + XSAVE(xsave_buf2, SAVE_MASK); + raise(SIGUSR2); + XSAVE(xsave_buf3, SAVE_MASK); + result[0] = check_xsave_buf(xsave_buf2, xsave_buf2, xsave_size, test_name, + NO_CHANGE); +} + +static void usr2_handler(int signum, siginfo_t *info, void *__ctxp) +{ + uint32_t ui32_random; + double flt; + + ui32_random = rand(); + flt = ui32_random/10000.0; + if (signum == SIGUSR2) { + ksft_print_msg("SIGUSR2:0x%x changed fld:%f & ymm0-15:0x%x\n", + SIGUSR2, flt, ui32_random); + change_fpu_content(ui32_random, flt); + } +} + +static void set_signal_handle(void) +{ + struct sigaction sigact; + + memset(&sigact, 0, sizeof(sigact)); + if (sigemptyset(&sigact.sa_mask)) + execution_failed("FAIL: sigemptyset error\n"); + + sigact.sa_flags = SA_SIGINFO; + + sigact.sa_sigaction = usr1_handler; + if (sigaction(SIGUSR1, &sigact, NULL)) + execution_failed("FAIL: SIGUSR1 handling failed\n"); + + sigact.sa_sigaction = usr2_handler; + if (sigaction(SIGUSR2, &sigact, NULL)) + execution_failed("FAIL: SIGUSR2 handling failed\n"); +} + +static void sig_handle_xsave_test(void) +{ + int i, loop_times = 100, xsave_size; + const char *sig_test_name0 = "Child XSAVE was same in nested signal test"; + const char *sig_test_name1 = "Child XSAVE content was same after signal"; + + xsave_size = get_xsave_size(); + /* SDM XSAVE: misalignment to a 64-byte boundary will result in #GP */ + xsave_buf0 = aligned_alloc(64, xsave_size); + if (!xsave_buf0) + execution_failed("aligned_alloc xsave_buf0 failed\n"); + xsave_buf1 = aligned_alloc(64, xsave_size); + if (!xsave_buf1) + execution_failed("aligned_alloc xsave_buf1 failed\n"); + xsave_buf2 = aligned_alloc(64, xsave_size); + if (!xsave_buf2) + execution_failed("aligned_alloc xsave_buf2 failed\n"); + xsave_buf3 = aligned_alloc(64, xsave_size); + if (!xsave_buf3) + execution_failed("aligned_alloc xsave_buf3 failed\n"); + + srand(time(NULL)); + result[0] = RESULT_PASS; + result[1] = RESULT_PASS; + + XSAVE(xsave_buf0, SAVE_MASK); + for (i = 1; i <= loop_times; i++) { + raise(SIGUSR1); + XSAVE(xsave_buf1, SAVE_MASK); + result[1] = check_xsave_buf(xsave_buf0, xsave_buf1, xsave_size, + sig_test_name1, NO_CHANGE); + if (result[1] != RESULT_PASS) + break; + } + + check_result(result[0], sig_test_name0); + check_result(result[1], sig_test_name1); +} + +static void test_xsave_sig_handle(void) +{ + const char *test_name0 = "xsave in child nested signal handling test"; + const char *test_name1 = "xsave after child signal handling test"; + pid_t child; + int status, fd[2], readbuf[2]; + + set_signal_handle(); + + /* Use pipe to transfer test result of child process to parent process */ + if (pipe(fd) < 0) + execution_failed("FAIL: create pipe failed\n"); + + /* Use child process testing to avoid abnormal blocking the next test */ + child = fork(); + if (child < 0) + execution_failed("FAIL: create child pid failed\n"); + else if (child == 0) { + populate_fpu_regs(); + sig_handle_xsave_test(); + close(fd[0]); + write(fd[1], &result, sizeof(result)); + } else { + if (waitpid(child, &status, 0) != child || + !WIFEXITED(status)) + execution_failed("FAIL: Child died unexpectedly\n"); + else { + close(fd[1]); + read(fd[0], &readbuf, sizeof(readbuf)); + + check_result(readbuf[0], test_name0); + check_result(readbuf[1], test_name1); + } + } +} + +int main(void) +{ + ksft_print_header(); + ksft_set_plan(2); + + test_xsave_sig_handle(); + + ksft_exit(!ksft_get_fail_cnt()); +}