From patchwork Mon Jan 20 18:42:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudio Imbrenda X-Patchwork-Id: 11342735 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5BA451398 for ; Mon, 20 Jan 2020 18:43:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2F20F22314 for ; Mon, 20 Jan 2020 18:43:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726982AbgATSnG (ORCPT ); Mon, 20 Jan 2020 13:43:06 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:53162 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726874AbgATSnG (ORCPT ); Mon, 20 Jan 2020 13:43:06 -0500 Received: from pps.filterd (m0098404.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00KIcrAu090477 for ; Mon, 20 Jan 2020 13:43:04 -0500 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2xmgdk8qph-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 20 Jan 2020 13:43:04 -0500 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 20 Jan 2020 18:43:00 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00KIgxKp48824484 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 20 Jan 2020 18:42:59 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 282C14C040; Mon, 20 Jan 2020 18:42:59 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D12824C044; Mon, 20 Jan 2020 18:42:58 +0000 (GMT) Received: from p-imbrenda.boeblingen.de.ibm.com (unknown [9.152.224.108]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 20 Jan 2020 18:42:58 +0000 (GMT) From: Claudio Imbrenda To: kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, thuth@redhat.com, david@redhat.com, borntraeger@de.ibm.com, frankja@linux.ibm.com Subject: [kvm-unit-tests PATCH v8 6/6] s390x: SCLP unit test Date: Mon, 20 Jan 2020 19:42:56 +0100 X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200120184256.188698-1-imbrenda@linux.ibm.com> References: <20200120184256.188698-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 20012018-0016-0000-0000-000002DF2711 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20012018-0017-0000-0000-00003341CC1D Message-Id: <20200120184256.188698-7-imbrenda@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-20_08:2020-01-20,2020-01-20 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 clxscore=1015 bulkscore=0 suspectscore=1 mlxlogscore=999 lowpriorityscore=0 spamscore=0 adultscore=0 malwarescore=0 impostorscore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001200156 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org SCLP unit test. Testing the following: * Correctly ignoring instruction bits that should be ignored * Privileged instruction check * Check for addressing exceptions * Specification exceptions: - SCCB size less than 8 - SCCB unaligned - SCCB overlaps prefix or lowcore - SCCB address higher than 2GB * Return codes for - Invalid command - SCCB too short (but at least 8) - SCCB page boundary violation Signed-off-by: Claudio Imbrenda Reviewed-by: Thomas Huth Acked-by: Janosch Frank --- s390x/Makefile | 1 + s390x/sclp.c | 474 ++++++++++++++++++++++++++++++++++++++++++++ s390x/unittests.cfg | 8 + 3 files changed, 483 insertions(+) create mode 100644 s390x/sclp.c diff --git a/s390x/Makefile b/s390x/Makefile index 3744372..ddb4b48 100644 --- a/s390x/Makefile +++ b/s390x/Makefile @@ -16,6 +16,7 @@ tests += $(TEST_DIR)/diag288.elf tests += $(TEST_DIR)/stsi.elf tests += $(TEST_DIR)/skrf.elf tests += $(TEST_DIR)/smp.elf +tests += $(TEST_DIR)/sclp.elf tests_binary = $(patsubst %.elf,%.bin,$(tests)) all: directories test_cases test_cases_binary diff --git a/s390x/sclp.c b/s390x/sclp.c new file mode 100644 index 0000000..215347e --- /dev/null +++ b/s390x/sclp.c @@ -0,0 +1,474 @@ +/* + * Service Call tests + * + * Copyright (c) 2019 IBM Corp + * + * Authors: + * Claudio Imbrenda + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2. + */ + +#include +#include +#include +#include +#include + +#define PGM_NONE 1 +#define PGM_BIT_SPEC (1ULL << PGM_INT_CODE_SPECIFICATION) +#define PGM_BIT_ADDR (1ULL << PGM_INT_CODE_ADDRESSING) +#define PGM_BIT_PRIV (1ULL << PGM_INT_CODE_PRIVILEGED_OPERATION) +#define MKPTR(x) ((void *)(uint64_t)(x)) + +#define LC_SIZE (2 * PAGE_SIZE) + +static uint8_t pagebuf[LC_SIZE] __attribute__((aligned(LC_SIZE))); /* scratch pages used for some tests */ +static uint8_t prefix_buf[LC_SIZE] __attribute__((aligned(LC_SIZE))); /* temporary lowcore for test_sccb_prefix */ +static uint8_t sccb_template[PAGE_SIZE]; /* SCCB template to be used */ +static uint32_t valid_code; /* valid command code for READ SCP INFO */ +static struct lowcore *lc; + +/** + * Perform one service call, handling exceptions and interrupts. + */ +static int sclp_service_call_test(unsigned int command, void *sccb) +{ + int cc; + + sclp_mark_busy(); + sclp_setup_int(); + cc = servc(command, __pa(sccb)); + if (lc->pgm_int_code) { + sclp_handle_ext(); + return 0; + } + if (!cc) + sclp_wait_busy(); + return cc; +} + +/** + * Perform one test at the given address, optionally using the SCCB template, + * checking for the expected program interrupts and return codes. + * + * The parameter buf_len indicates the number of bytes of the template that + * should be copied to the test address, and should be 0 when the test + * address is invalid, in which case nothing is copied. + * + * The template is used to simplify tests where the same buffer content is + * used many times in a row, at different addresses. + * + * Returns true in case of success or false in case of failure + */ +static bool test_one_sccb(uint32_t cmd, uint8_t *addr, uint16_t buf_len, uint64_t exp_pgm, uint16_t exp_rc) +{ + SCCBHeader *h = (SCCBHeader *)addr; + int res, pgm; + + /* Copy the template to the test address if needed */ + if (buf_len) + memcpy(addr, sccb_template, buf_len); + if (exp_pgm != PGM_NONE) + expect_pgm_int(); + /* perform the actual call */ + res = sclp_service_call_test(cmd, h); + if (res) { + report_info("SCLP not ready (command %#x, address %p, cc %d)", cmd, addr, res); + return false; + } + pgm = clear_pgm_int(); + /* Check if the program exception was one of the expected ones */ + if (!((1ULL << pgm) & exp_pgm)) { + report_info("First failure at addr %p, buf_len %d, cmd %#x, pgm code %d", + addr, buf_len, cmd, pgm); + return false; + } + /* Check if the response code is the one expected */ + if (exp_rc && exp_rc != h->response_code) { + report_info("First failure at addr %p, buf_len %d, cmd %#x, resp code %#x", + addr, buf_len, cmd, h->response_code); + return false; + } + return true; +} + +/** + * Wrapper for test_one_sccb to be used when the template should not be + * copied and the memory address should not be touched. + */ +static bool test_one_ro(uint32_t cmd, uint8_t *addr, uint64_t exp_pgm, uint16_t exp_rc) +{ + return test_one_sccb(cmd, addr, 0, exp_pgm, exp_rc); +} + +/** + * Wrapper for test_one_sccb to set up a simple SCCB template. + * + * The parameter sccb_len indicates the value that will be saved in the SCCB + * length field of the SCCB, buf_len indicates the number of bytes of + * template that need to be copied to the actual test address. In many cases + * it's enough to clear/copy the first 8 bytes of the buffer, while the SCCB + * itself can be larger. + * + * Returns true in case of success or false in case of failure + */ +static bool test_one_simple(uint32_t cmd, uint8_t *addr, uint16_t sccb_len, + uint16_t buf_len, uint64_t exp_pgm, uint16_t exp_rc) +{ + memset(sccb_template, 0, sizeof(sccb_template)); + ((SCCBHeader *)sccb_template)->length = sccb_len; + return test_one_sccb(cmd, addr, buf_len, exp_pgm, exp_rc); +} + +/** + * Test SCCB lengths < 8. + */ +static void test_sccb_too_short(void) +{ + int len; + + for (len = 0; len < 8; len++) + if (!test_one_simple(valid_code, pagebuf, len, 8, PGM_BIT_SPEC, 0)) + break; + + report(len == 8, "SCCB too short"); +} + +/** + * Test SCCBs that are not 64-bit aligned. + */ +static void test_sccb_unaligned(void) +{ + int offset; + + for (offset = 1; offset < 8; offset++) + if (!test_one_simple(valid_code, offset + pagebuf, 8, 8, PGM_BIT_SPEC, 0)) + break; + report(offset == 8, "SCCB unaligned"); +} + +/** + * Test SCCBs whose address is in the lowcore or prefix area. + */ +static void test_sccb_prefix(void) +{ + uint8_t scratch[LC_SIZE]; + uint32_t prefix, new_prefix; + int offset; + + /* + * copy the current lowcore to the future new location, otherwise we + * will not have a valid lowcore after setting the new prefix. + */ + memcpy(prefix_buf, 0, LC_SIZE); + /* save the current prefix (it's probably going to be 0) */ + prefix = get_prefix(); + /* + * save the current content of absolute pages 0 and 1, so we can + * restore them after we trash them later on + */ + memcpy(scratch, (void *)(intptr_t)prefix, LC_SIZE); + /* set the new prefix to prefix_buf */ + new_prefix = (uint32_t)(intptr_t)prefix_buf; + set_prefix(new_prefix); + + /* + * testing with SCCB addresses in the lowcore; since we can't + * actually trash the lowcore (unsurprisingly, things break if we + * do), this will be a read-only test. + */ + for (offset = 0; offset < LC_SIZE; offset += 8) + if (!test_one_ro(valid_code, MKPTR(offset), PGM_BIT_SPEC, 0)) + break; + report(offset == LC_SIZE, "SCCB low pages"); + + /* + * the SCLP should not even touch the memory, but we will write the + * SCCBs all over the two pages starting at absolute address 0, thus + * trashing them; we will need to restore them later. + */ + for (offset = 0; offset < LC_SIZE; offset += 8) + if (!test_one_simple(valid_code, MKPTR(new_prefix + offset), 8, 8, PGM_BIT_SPEC, 0)) + break; + report(offset == LC_SIZE, "SCCB prefix pages"); + + /* restore the previous contents of absolute pages 0 and 1 */ + memcpy(prefix_buf, 0, LC_SIZE); + /* restore the prefix to the original value */ + set_prefix(prefix); +} + +/** + * Test SCCBs that are above 2GB. If outside of memory, an addressing + * exception is also allowed. + */ +static void test_sccb_high(void) +{ + SCCBHeader *h = (SCCBHeader *)pagebuf; + uintptr_t a[33 * 4 * 2 + 2]; /* for the list of addresses to test */ + + uint64_t maxram; + int i, pgm, len = 0; + + h->length = 8; + /* addresses with 1 bit set in the first 33 bits */ + for (i = 0; i < 33; i++) + a[len++] = 1UL << (i + 31); + /* addresses with 2 consecutive bits set in the first 33 bits */ + for (i = 0; i < 33; i++) + a[len++] = 3UL << (i + 31); + /* addresses with all bits set in bits 0..N */ + for (i = 0; i < 33; i++) + a[len++] = 0xffffffff80000000UL << i; + /* addresses with all bits set in bits N..33 */ + a[len++] = 0x80000000; + for (i = 1; i < 33; i++, len++) + a[len] = a[len - 1] | (1UL << (i + 31)); + /* all the addresses above, but adding the offset of a valid buffer */ + for (i = 0; i < len; i++) + a[len + i] = a[i] + (intptr_t)h; + len += i; + /* two more hand-crafted addresses */ + a[len++] = 0xdeadbeef00000000; + a[len++] = 0xdeaddeadbeef0000; + + maxram = get_ram_size(); + for (i = 0; i < len; i++) { + pgm = PGM_BIT_SPEC | (a[i] >= maxram ? PGM_BIT_ADDR : 0); + if (!test_one_ro(valid_code, (void *)a[i], pgm, 0)) + break; + } + report(i == len, "SCCB high addresses"); +} + +/** + * Test invalid commands, both invalid command detail codes and valid + * ones with invalid command class code. + */ +static void test_inval(void) +{ + const uint16_t res = SCLP_RC_INVALID_SCLP_COMMAND; + uint32_t cmd; + int i; + + report_prefix_push("Invalid command"); + for (i = 0; i < 65536; i++) { + cmd = 0xdead0000 | i; + if (!test_one_simple(cmd, pagebuf, PAGE_SIZE, PAGE_SIZE, PGM_NONE, res)) + break; + } + report(i == 65536, "Command detail code"); + + for (i = 0; i < 256; i++) { + cmd = (valid_code & ~0xff) | i; + if (cmd == valid_code) + continue; + if (!test_one_simple(cmd, pagebuf, PAGE_SIZE, PAGE_SIZE, PGM_NONE, res)) + break; + } + report(i == 256, "Command class code"); + report_prefix_pop(); +} + + +/** + * Test short SCCBs (but larger than 8). + */ +static void test_short(void) +{ + const uint16_t res = SCLP_RC_INSUFFICIENT_SCCB_LENGTH; + int len; + + for (len = 8; len < 144; len++) + if (!test_one_simple(valid_code, pagebuf, len, len, PGM_NONE, res)) + break; + report(len == 144, "Insufficient SCCB length (Read SCP info)"); + + for (len = 8; len < 40; len++) + if (!test_one_simple(SCLP_READ_CPU_INFO, pagebuf, len, len, PGM_NONE, res)) + break; + report(len == 40, "Insufficient SCCB length (Read CPU info)"); +} + +/** + * Test SCCB page boundary violations. + */ +static void test_boundary(void) +{ + const uint32_t cmd = SCLP_CMD_WRITE_EVENT_DATA; + const uint16_t res = SCLP_RC_SCCB_BOUNDARY_VIOLATION; + WriteEventData *sccb = (WriteEventData *)sccb_template; + int len, offset; + + memset(sccb_template, 0, sizeof(sccb_template)); + sccb->h.function_code = SCLP_FC_NORMAL_WRITE; + for (len = 32; len <= 4096; len++) { + offset = len & 7 ? len & ~7 : len - 8; + for (offset = 4096 - offset; offset < 4096; offset += 8) { + sccb->h.length = len; + if (!test_one_sccb(cmd, offset + pagebuf, len, PGM_NONE, res)) + goto out; + } + } +out: + report(len > 4096 && offset == 4096, "SCCB page boundary violation"); +} + +/** + * Test excessively long SCCBs. + */ +static void test_toolong(void) +{ + const uint32_t cmd = SCLP_CMD_WRITE_EVENT_DATA; + const uint16_t res = SCLP_RC_SCCB_BOUNDARY_VIOLATION; + WriteEventData *sccb = (WriteEventData *)sccb_template; + int len; + + memset(sccb_template, 0, sizeof(sccb_template)); + sccb->h.function_code = SCLP_FC_NORMAL_WRITE; + for (len = 4097; len < 8192; len++) { + sccb->h.length = len; + if (!test_one_sccb(cmd, pagebuf, PAGE_SIZE, PGM_NONE, res)) + break; + } + report(len == 8192, "SCCB bigger than 4k"); +} + +/** + * Test privileged operation. + */ +static void test_priv(void) +{ + SCCBHeader *h = (SCCBHeader *)pagebuf; + + report_prefix_push("Privileged operation"); + h->length = 8; + expect_pgm_int(); + enter_pstate(); + servc(valid_code, __pa(h)); + check_pgm_int_code(PGM_INT_CODE_PRIVILEGED_OPERATION); + report_prefix_pop(); +} + +/** + * Test addressing exceptions. We need to test SCCB addresses between the + * end of available memory and 2GB, because after 2GB a specification + * exception is also allowed. + * Only applicable if the VM has less than 2GB of memory + */ +static void test_addressing(void) +{ + unsigned long i, maxram = get_ram_size(); + + /* the VM has more than 2GB of memory */ + if (maxram >= 0x80000000) { + report_skip("Invalid SCCB address"); + return; + } + /* test all possible valid addresses immediately after the end of memory + * up to 64KB after the end of memory + */ + for (i = 0; i < 0x10000 && i + maxram < 0x80000000; i += 8) + if (!test_one_ro(valid_code, MKPTR(i + maxram), PGM_BIT_ADDR, 0)) + goto out; + /* test more addresses until we reach 1MB after end of memory; + * increment by a prime number (times 8) in order to test all + * possible valid offsets inside pages + */ + for (; i < 0x100000 && i + maxram < 0x80000000 ; i += 808) + if (!test_one_ro(valid_code, MKPTR(i + maxram), PGM_BIT_ADDR, 0)) + goto out; + /* test the remaining addresses until we reach address 2GB; + * increment by a prime number (times 8) in order to test all + * possible valid offsets inside pages + */ + for (; i + maxram < 0x80000000; i += 800024) + if (!test_one_ro(valid_code, MKPTR(i + maxram), PGM_BIT_ADDR, 0)) + goto out; +out: + report(i + maxram >= 0x80000000, "Invalid SCCB address"); +} + +/** + * Test some bits in the instruction format that are specified to be ignored. + */ +static void test_instbits(void) +{ + SCCBHeader *h = (SCCBHeader *)pagebuf; + int cc; + + sclp_mark_busy(); + h->length = 8; + sclp_setup_int(); + + asm volatile( + " .insn rre,0xb2204200,%1,%2\n" /* servc %1,%2 */ + " ipm %0\n" + " srl %0,28" + : "=&d" (cc) : "d" (valid_code), "a" (__pa(pagebuf)) + : "cc", "memory"); + /* No exception, but also no command accepted, so no interrupt is + * expected. We need to clear the flag manually otherwise we will + * loop forever when we try to report failure. + */ + if (cc) + sclp_handle_ext(); + else + sclp_wait_busy(); + report(cc == 0, "Instruction format ignored bits"); +} + +/** + * Find a valid READ INFO command code; not all codes are always allowed, and + * probing should be performed in the right order. + */ +static void find_valid_sclp_code(void) +{ + const unsigned int commands[] = { SCLP_CMDW_READ_SCP_INFO_FORCED, + SCLP_CMDW_READ_SCP_INFO }; + SCCBHeader *h = (SCCBHeader *)pagebuf; + int i, cc; + + for (i = 0; i < ARRAY_SIZE(commands); i++) { + sclp_mark_busy(); + memset(h, 0, sizeof(*h)); + h->length = 4096; + + valid_code = commands[i]; + cc = sclp_service_call(commands[i], h); + if (cc) + break; + if (h->response_code == SCLP_RC_NORMAL_READ_COMPLETION) + return; + if (h->response_code != SCLP_RC_INVALID_SCLP_COMMAND) + break; + } + report_abort("READ_SCP_INFO failed"); +} + +int main(void) +{ + report_prefix_push("sclp"); + find_valid_sclp_code(); + + /* Test some basic things */ + test_instbits(); + test_priv(); + test_addressing(); + + /* Test the specification exceptions */ + test_sccb_too_short(); + test_sccb_unaligned(); + test_sccb_prefix(); + test_sccb_high(); + + /* Test the expected response codes */ + test_inval(); + test_short(); + test_boundary(); + test_toolong(); + + return report_summary(); +} diff --git a/s390x/unittests.cfg b/s390x/unittests.cfg index f1b07cd..07013b2 100644 --- a/s390x/unittests.cfg +++ b/s390x/unittests.cfg @@ -75,3 +75,11 @@ file = stsi.elf [smp] file = smp.elf extra_params =-smp 2 + +[sclp-1g] +file = sclp.elf +extra_params = -m 1G + +[sclp-3g] +file = sclp.elf +extra_params = -m 3G