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Mon, 19 Aug 2024 14:00:54 +0000 (GMT) From: Hariharan Mari To: linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, shuah@kernel.org, frankja@linux.ibm.com, borntraeger@linux.ibm.com, imbrenda@linux.ibm.com, david@redhat.com, pbonzini@redhat.com Subject: [PATCH v1 5/5] KVM: s390: selftests: Add regression tests for PLO subfunctions Date: Mon, 19 Aug 2024 15:54:26 +0200 Message-ID: <20240819140040.1087552-6-hari55@linux.ibm.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240819140040.1087552-1-hari55@linux.ibm.com> References: <20240819140040.1087552-1-hari55@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: znkhn4mQ0BmSZgUWvl1xAvKRl3kLRiMq X-Proofpoint-GUID: 3CFScvYy-Bwq1ZUNjm71HJlDcAb8LVep X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-19_11,2024-08-19_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 phishscore=0 mlxscore=0 bulkscore=0 malwarescore=0 mlxlogscore=999 spamscore=0 lowpriorityscore=0 clxscore=1015 suspectscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408190090 Extend the existing regression test framework for s390x CPU subfunctions to include tests for the Perform Locked Operation (PLO) subfunction functions. PLO was introduced in the very first 64-bit machine generation. Hence it is assumed PLO is always installed in the Z Arch. The test procedure follows the established pattern. Suggested-by: Janosch Frank Signed-off-by: Hariharan Mari Reviewed-by: Janosch Frank --- .../kvm/s390x/cpumodel_subfuncs_test.c | 36 ++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c index 901c99fe79d9..255984a52365 100644 --- a/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c +++ b/tools/testing/selftests/kvm/s390x/cpumodel_subfuncs_test.c @@ -20,6 +20,8 @@ #include "kvm_util.h" +#define U8_MAX ((u8)~0U) + /** * Query available CPU subfunctions */ @@ -37,6 +39,33 @@ static void get_cpu_machine_subfuntions(struct kvm_vm *vm, TEST_ASSERT(!r, "Get cpu subfunctions failed r=%d errno=%d", r, errno); } +static inline int plo_test_bit(unsigned char nr) +{ + unsigned long function = (unsigned long)nr | 0x100; + int cc; + + asm volatile(" lgr 0,%[function]\n" + /* Parameter registers are ignored for "test bit" */ + " plo 0,0,0,0(0)\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc) + : [function] "d" (function) + : "cc", "0"); + return cc == 0; +} + +/* + * Testing Perform Locked Operation (PLO) CPU subfunction's ASM block + */ +static void test_plo_asm_block(u8 (*query)[32]) +{ + for (int i = 0; i <= U8_MAX; ++i) { + if (plo_test_bit(i)) + (*query)[i >> 3] |= 0x80 >> (i & 7); + } +} + /* * Testing Crypto Compute Message Authentication Code (KMAC) CPU subfunction's * ASM block @@ -235,8 +264,13 @@ struct testdef { u8 *subfunc_array; size_t array_size; testfunc_t test; - bool facility_bit; + int facility_bit; } testlist[] = { + /* PLO was introduced in the very first 64-bit machine generation. + * Hence it is assumed PLO is always installed in Z Arch . + */ + { "PLO", cpu_subfunc.plo, sizeof(cpu_subfunc.plo), + test_plo_asm_block, 1 }, /* MSA - Facility bit 17 */ { "KMAC", cpu_subfunc.kmac, sizeof(cpu_subfunc.kmac), test_kmac_asm_block, 17 },