From mboxrd@z Thu Jan 1 00:00:00 1970 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 99F51C25B08 for ; Wed, 10 Aug 2022 07:46:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231301AbiHJHqe (ORCPT ); Wed, 10 Aug 2022 03:46:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39304 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231216AbiHJHqZ (ORCPT ); Wed, 10 Aug 2022 03:46:25 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2DB967C98 for ; Wed, 10 Aug 2022 00:46:24 -0700 (PDT) Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27A5caoR031120 for ; Wed, 10 Aug 2022 07:46:24 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=inFqxBSu9cFJ9q3u/x8sLK3QHoPPZCuBdq/jtlu2Ts4=; b=kJ0FOkdSkbAglT0bPONxgtCTWdIYY7WpvMr7+3Krbr2je+y2gbdfZ/jua2ppBD9MHtDM AP8M9AEJImtdH6LZBi0Vuj9Fd6uD/OBCskkMa+WzxZYS94jQAM4oimb+nrSiYL62hB8+ mVZyW11CPsNstsS63Nt1FU6+o9tx6eVD0qUZZLtPUR0MCPUGOzK9W0W2B+1n5hrgg/WX iaTgU3WVWa02ffjSdJvFoH2FM9eitGuLuTz3hebZHKWxZ7SnlVdjQBZkcXxC5dNTeWWJ /Toy6swiNPIsF1Rp4pNAg3YSno/Xtx1RqIXyQGp9vkBfnjttmWb6rgN/es4p8jHIUDwe DA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3hv1fvahqj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 10 Aug 2022 07:46:24 +0000 Received: from m0187473.ppops.net (m0187473.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 27A7UlZg028591 for ; Wed, 10 Aug 2022 07:46:24 GMT Received: from ppma05fra.de.ibm.com (6c.4a.5195.ip4.static.sl-reverse.com [149.81.74.108]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3hv1fvahp1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 10 Aug 2022 07:46:23 +0000 Received: from pps.filterd (ppma05fra.de.ibm.com [127.0.0.1]) by ppma05fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 27A7ZDpl028227; Wed, 10 Aug 2022 07:46:21 GMT Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by ppma05fra.de.ibm.com with ESMTP id 3huwvjgdgn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 10 Aug 2022 07:46:21 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 27A7kI0f29294926 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 10 Aug 2022 07:46:18 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 14AE44C046; Wed, 10 Aug 2022 07:46:18 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E38294C050; Wed, 10 Aug 2022 07:46:17 +0000 (GMT) Received: from a46lp57.lnxne.boe (unknown [9.152.108.100]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 10 Aug 2022 07:46:17 +0000 (GMT) From: Nico Boehr To: kvm@vger.kernel.org Cc: frankja@linux.ibm.com, imbrenda@linux.ibm.com, thuth@redhat.com Subject: [kvm-unit-tests PATCH v4 3/3] s390x: smp: add tests for calls in wait state Date: Wed, 10 Aug 2022 09:46:16 +0200 Message-Id: <20220810074616.1223561-4-nrb@linux.ibm.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220810074616.1223561-1-nrb@linux.ibm.com> References: <20220810074616.1223561-1-nrb@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: kFIgykuJXNPaYPPfjdefhcQk03-4TUNW X-Proofpoint-GUID: rqnA3w_t8SeZ7TdxYv9zatjD7lfzDb1a X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-10_03,2022-08-09_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxlogscore=910 adultscore=0 impostorscore=0 suspectscore=0 bulkscore=0 spamscore=0 priorityscore=1501 clxscore=1015 malwarescore=0 lowpriorityscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208100021 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org When the SIGP interpretation facility is in use a SIGP external call to a waiting CPU will result in an exit of the calling cpu. For non-pv guests it's a code 56 (partial execution) exit otherwise its a code 108 (secure instruction notification) exit. Those exits are handled differently from a normal SIGP instruction intercept that happens without interpretation and hence need to be tested. Signed-off-by: Nico Boehr --- s390x/smp.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) diff --git a/s390x/smp.c b/s390x/smp.c index 5a269087581f..91f3e3bcc12a 100644 --- a/s390x/smp.c +++ b/s390x/smp.c @@ -356,6 +356,102 @@ static void test_calls(void) } } +static void call_in_wait_ext_int_fixup(struct stack_frame_int *stack) +{ + /* Clear wait bit so we don't immediately wait again after the fixup */ + lowcore.ext_old_psw.mask &= ~PSW_MASK_WAIT; +} + +static void call_in_wait_setup(void) +{ + expect_ext_int(); + ctl_set_bit(0, current_sigp_call_case->cr0_bit); + register_ext_cleanup_func(call_in_wait_ext_int_fixup); + + set_flag(1); +} + +static void call_in_wait_received(void) +{ + report(lowcore.ext_int_code == current_sigp_call_case->ext_int_expected_type, "received"); + + set_flag(1); +} + +static void call_in_wait_cleanup(void) +{ + ctl_clear_bit(0, current_sigp_call_case->cr0_bit); + register_ext_cleanup_func(NULL); + + set_flag(1); +} + +static void test_calls_in_wait(void) +{ + int i; + struct psw psw; + + report_prefix_push("psw wait"); + for (i = 0; i < ARRAY_SIZE(cases_sigp_call); i++) { + current_sigp_call_case = &cases_sigp_call[i]; + + report_prefix_push(current_sigp_call_case->name); + if (!current_sigp_call_case->supports_pv && uv_os_is_guest()) { + report_skip("Not supported under PV"); + report_prefix_pop(); + continue; + } + + /* Let the secondary CPU setup the external mask and the external interrupt cleanup function */ + set_flag(0); + psw.mask = extract_psw_mask(); + psw.addr = (unsigned long)call_in_wait_setup; + smp_cpu_start(1, psw); + + /* Wait until the receiver has finished setup */ + wait_for_flag(); + set_flag(0); + + /* + * To avoid races, we need to know that the secondary CPU has entered wait, + * but the architecture provides no way to check whether the secondary CPU + * is in wait. + * + * But since a waiting CPU is considered operating, simply stop the CPU, set + * up the restart new PSW mask in wait, send the restart interrupt and then + * wait until the CPU becomes operating (done by smp_cpu_start). + */ + smp_cpu_stop(1); + psw.mask = extract_psw_mask() | PSW_MASK_EXT | PSW_MASK_WAIT; + psw.addr = (unsigned long)call_in_wait_received; + smp_cpu_start(1, psw); + + smp_sigp(1, current_sigp_call_case->call, 0, NULL); + + /* Wait until the receiver has handled the call */ + wait_for_flag(); + smp_cpu_stop(1); + set_flag(0); + + /* + * Now clean up the mess we have left behind. If the cleanup + * were part of call_in_wait_received we would not get a chance + * to catch an interrupt that is presented twice since we would + * disable the external call on the first interrupt. + */ + psw.mask = extract_psw_mask(); + psw.addr = (unsigned long)call_in_wait_cleanup; + smp_cpu_start(1, psw); + + /* Wait until the cleanup has been completed */ + wait_for_flag(); + smp_cpu_stop(1); + + report_prefix_pop(); + } + report_prefix_pop(); +} + static void test_sense_running(void) { report_prefix_push("sense_running"); @@ -474,6 +570,7 @@ int main(void) test_store_status(); test_set_prefix(); test_calls(); + test_calls_in_wait(); test_sense_running(); test_reset(); test_reset_initial(); -- 2.36.1