From patchwork Fri Aug 26 16:11:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janis Schoetterl-Glausch X-Patchwork-Id: 12956259 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 171F0ECAAA3 for ; Fri, 26 Aug 2022 16:11:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244490AbiHZQL0 (ORCPT ); Fri, 26 Aug 2022 12:11:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244406AbiHZQLW (ORCPT ); Fri, 26 Aug 2022 12:11:22 -0400 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B7680C2FBB; Fri, 26 Aug 2022 09:11:21 -0700 (PDT) Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27QFl3Mg021452; Fri, 26 Aug 2022 16:11:20 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=oPlHG/kPgDWGkQktQysb26KjfEQOLKc1F96eKwARyjc=; b=JONl5PZ+PeJ3fqJ40WI5F+qjl5T2nLbQdkuAa3Xc485HSHDEk0vQIRcAXnS8dw5BQkz2 v7m3QLtYVv46Onyz07+R3GflkvS0Ecuj4Tdlj5yK0UJMkpI6RQd7vRpIQyerndz3gjgg 7SOsVsjN9Nia6Uwzc6gp7iiLWzdkL9SbD9z6OEmu5RxwGpuMWw7iGxbEFPWz2PBLaKvL jB9mfLwgLktVX8xiXnf684Kx99I6pN12+qR6HVlybDsAOBxij1WdXR2+rEbOD/gl3Ql/ NsB52/zr4Uq88+hXpz6ibrX8bGvu+iGZ7AbURCf5LHYRaJEkvSSR+h9N0HSt7xVnrfG8 Yg== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3j714d0qtw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 26 Aug 2022 16:11:20 +0000 Received: from m0098417.ppops.net (m0098417.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 27QFlk0B024107; Fri, 26 Aug 2022 16:11:19 GMT Received: from ppma04fra.de.ibm.com (6a.4a.5195.ip4.static.sl-reverse.com [149.81.74.106]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3j714d0qt3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 26 Aug 2022 16:11:19 +0000 Received: from pps.filterd (ppma04fra.de.ibm.com [127.0.0.1]) by ppma04fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 27QFpVnw031362; Fri, 26 Aug 2022 16:11:18 GMT Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by ppma04fra.de.ibm.com with ESMTP id 3j2q88wuc2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 26 Aug 2022 16:11:17 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 27QGBE7Q28377468 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 26 Aug 2022 16:11:14 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AEAD44C046; Fri, 26 Aug 2022 16:11:14 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 74FDA4C044; Fri, 26 Aug 2022 16:11:14 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 26 Aug 2022 16:11:14 +0000 (GMT) From: Janis Schoetterl-Glausch To: Thomas Huth , Janosch Frank , Claudio Imbrenda , David Hildenbrand Cc: Janis Schoetterl-Glausch , kvm@vger.kernel.org, linux-s390@vger.kernel.org Subject: [kvm-unit-tests PATCH v6 1/2] s390x: Add specification exception test Date: Fri, 26 Aug 2022 18:11:11 +0200 Message-Id: <20220826161112.3786131-2-scgl@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220826161112.3786131-1-scgl@linux.ibm.com> References: <20220826161112.3786131-1-scgl@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: MBH1tTKQGN8UDh9cF1tE27t5n2NtcXTu X-Proofpoint-GUID: bTzAw7e8iPINOcXYXMvkRIdG1XvM2CBi X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-26_08,2022-08-25_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 adultscore=0 priorityscore=1501 mlxlogscore=999 suspectscore=0 mlxscore=0 clxscore=1015 bulkscore=0 impostorscore=0 lowpriorityscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208260065 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Generate specification exceptions and check that they occur. Signed-off-by: Janis Schoetterl-Glausch Reviewed-by: Nico Boehr Reviewed-by: Janosch Frank --- s390x/Makefile | 1 + lib/s390x/asm/arch_def.h | 5 + s390x/spec_ex.c | 194 +++++++++++++++++++++++++++++++++++++++ s390x/unittests.cfg | 3 + 4 files changed, 203 insertions(+) create mode 100644 s390x/spec_ex.c diff --git a/s390x/Makefile b/s390x/Makefile index efd5e0c1..58b1bf54 100644 --- a/s390x/Makefile +++ b/s390x/Makefile @@ -27,6 +27,7 @@ tests += $(TEST_DIR)/uv-host.elf tests += $(TEST_DIR)/edat.elf tests += $(TEST_DIR)/mvpg-sie.elf tests += $(TEST_DIR)/spec_ex-sie.elf +tests += $(TEST_DIR)/spec_ex.elf tests += $(TEST_DIR)/firq.elf tests += $(TEST_DIR)/epsw.elf tests += $(TEST_DIR)/adtl-status.elf diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h index e7ae454b..b6e60fb0 100644 --- a/lib/s390x/asm/arch_def.h +++ b/lib/s390x/asm/arch_def.h @@ -41,6 +41,11 @@ struct psw { uint64_t addr; }; +struct short_psw { + uint32_t mask; + uint32_t addr; +}; + struct cpu { struct lowcore *lowcore; uint64_t *stack; diff --git a/s390x/spec_ex.c b/s390x/spec_ex.c new file mode 100644 index 00000000..68469e4b --- /dev/null +++ b/s390x/spec_ex.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright IBM Corp. 2021, 2022 + * + * Specification exception test. + * Tests that specification exceptions occur when expected. + * + * Can be extended by adding triggers to spec_ex_triggers, see comments below. + */ +#include +#include +#include +#include + +/* toggled to signal occurrence of invalid psw fixup */ +static bool invalid_psw_expected; +static struct psw expected_psw; +static struct psw invalid_psw; +static struct psw fixup_psw; + +/* + * The standard program exception handler cannot deal with invalid old PSWs, + * especially not invalid instruction addresses, as in that case one cannot + * find the instruction following the faulting one from the old PSW. + * The PSW to return to is set by load_psw. + */ +static void fixup_invalid_psw(struct stack_frame_int *stack) +{ + /* signal occurrence of invalid psw fixup */ + invalid_psw_expected = false; + invalid_psw = lowcore.pgm_old_psw; + lowcore.pgm_old_psw = fixup_psw; +} + +/* + * Load possibly invalid psw, but setup fixup_psw before, + * so that fixup_invalid_psw() can bring us back onto the right track. + * Also acts as compiler barrier, -> none required in expect/check_invalid_psw + */ +static void load_psw(struct psw psw) +{ + uint64_t scratch; + + /* + * The fixup psw is current psw with the instruction address replaced by + * the address of the nop following the instruction loading the new psw. + */ + fixup_psw.mask = extract_psw_mask(); + asm volatile ( "larl %[scratch],0f\n" + " stg %[scratch],%[fixup_addr]\n" + " lpswe %[psw]\n" + "0: nop\n" + : [scratch] "=&d" (scratch), + [fixup_addr] "=&T" (fixup_psw.addr) + : [psw] "Q" (psw) + : "cc", "memory" + ); +} + +static void load_short_psw(struct short_psw psw) +{ + uint64_t scratch; + + fixup_psw.mask = extract_psw_mask(); + asm volatile ( "larl %[scratch],0f\n" + " stg %[scratch],%[fixup_addr]\n" + " lpsw %[psw]\n" + "0: nop\n" + : [scratch] "=&d" (scratch), + [fixup_addr] "=&T" (fixup_psw.addr) + : [psw] "Q" (psw) + : "cc", "memory" + ); +} + +static void expect_invalid_psw(struct psw psw) +{ + expected_psw = psw; + invalid_psw_expected = true; +} + +static int check_invalid_psw(void) +{ + if (!invalid_psw_expected) { + if (expected_psw.mask == invalid_psw.mask && + expected_psw.addr == invalid_psw.addr) + return 0; + report_fail("Wrong invalid PSW"); + } else { + report_fail("Expected exception due to invalid PSW"); + } + return 1; +} + +/* For normal PSWs bit 12 has to be 0 to be a valid PSW*/ +static int psw_bit_12_is_1(void) +{ + struct psw invalid = { + .mask = BIT(63 - 12), + .addr = 0x00000000deadbeee + }; + + expect_invalid_psw(invalid); + load_psw(invalid); + return check_invalid_psw(); +} + +/* A short PSW needs to have bit 12 set to be valid. */ +static int short_psw_bit_12_is_0(void) +{ + struct short_psw short_invalid = { + .mask = 0x0, + .addr = 0xdeadbeee + }; + + /* + * lpsw may optionally check bit 12 before loading the new psw + * -> cannot check the expected invalid psw like with lpswe + */ + load_short_psw(short_invalid); + return 0; +} + +static int bad_alignment(void) +{ + uint32_t words[5] __attribute__((aligned(16))); + uint32_t (*bad_aligned)[4] = (uint32_t (*)[4])&words[1]; + + /* LOAD PAIR FROM QUADWORD (LPQ) requires quadword alignment */ + asm volatile ("lpq %%r6,%[bad]" + : : [bad] "T" (*bad_aligned) + : "%r6", "%r7" + ); + return 0; +} + +static int not_even(void) +{ + uint64_t quad[2] __attribute__((aligned(16))) = {0}; + + asm volatile (".insn rxy,0xe3000000008f,%%r7,%[quad]" /* lpq %%r7,%[quad] */ + : : [quad] "T" (quad) + : "%r7", "%r8" + ); + return 0; +} + +/* + * Harness for specification exception testing. + * func only triggers exception, reporting is taken care of automatically. + */ +struct spec_ex_trigger { + const char *name; + int (*func)(void); + void (*fixup)(struct stack_frame_int *stack); +}; + +/* List of all tests to execute */ +static const struct spec_ex_trigger spec_ex_triggers[] = { + { "psw_bit_12_is_1", &psw_bit_12_is_1, &fixup_invalid_psw }, + { "short_psw_bit_12_is_0", &short_psw_bit_12_is_0, &fixup_invalid_psw }, + { "bad_alignment", &bad_alignment, NULL }, + { "not_even", ¬_even, NULL }, + { NULL, NULL, NULL }, +}; + +static void test_spec_ex(const struct spec_ex_trigger *trigger) +{ + int rc; + + expect_pgm_int(); + register_pgm_cleanup_func(trigger->fixup); + rc = trigger->func(); + register_pgm_cleanup_func(NULL); + /* test failed, nothing to be done, reporting responsibility of trigger */ + if (rc) + return; + check_pgm_int_code(PGM_INT_CODE_SPECIFICATION); +} + +int main(int argc, char **argv) +{ + unsigned int i; + + report_prefix_push("specification exception"); + for (i = 0; spec_ex_triggers[i].name; i++) { + report_prefix_push(spec_ex_triggers[i].name); + test_spec_ex(&spec_ex_triggers[i]); + report_prefix_pop(); + } + report_prefix_pop(); + + return report_summary(); +} diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg index f7b1fc3d..2ecaee1f 100644 --- a/s390x/unittests.cfg +++ b/s390x/unittests.cfg @@ -114,6 +114,9 @@ file = mvpg-sie.elf [spec_ex-sie] file = spec_ex-sie.elf +[spec_ex] +file = spec_ex.elf + [firq-linear-cpu-ids-kvm] file = firq.elf timeout = 20