From patchwork Tue Mar 2 11:41:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudio Imbrenda X-Patchwork-Id: 12111749 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,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 281C0C4360C for ; Tue, 2 Mar 2021 16:07:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0850664E7C for ; Tue, 2 Mar 2021 16:07:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1449041AbhCBQDm (ORCPT ); Tue, 2 Mar 2021 11:03:42 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:44122 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383647AbhCBL5X (ORCPT ); Tue, 2 Mar 2021 06:57:23 -0500 Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 122BXLdI036558 for ; Tue, 2 Mar 2021 06:41:15 -0500 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=eGLBu8j2kuIQ2X8fG8kpVJ2IHvGVtRqXnrjQara9TlM=; b=Gak77mjMFF0xSdt392nYQY+yQrti3UwioTAnuWyqdgGbJ6lDTuDweztVtP3MPthNF9ov ieALwo67N0Qe107hXD1SVLP9E4O/DSIo0HZtTp/mjlEJuQbfgQ/D/Z/30nK2PYz/BS83 9JbbGM23pSJE+SnyuA1l0Hw18bHAD2tphmZMzcWUPJwB5h7uBQ4yFuQfqTpfeur+1gPT zROJmto/2VZWc4RDDsfJAhMq9lX0yMuv+HIP9bNmVGpPiElMP5P7gjQO/vAMYnlT/oSM Ks6t27J4jpVllmpPJJnL3qzCEPU7s+acy9ZdoY/YSs5+EAPVpSMpB4j4uOfLU/4uu0Ln dA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 371mjp88fq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 02 Mar 2021 06:41:14 -0500 Received: from m0187473.ppops.net (m0187473.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 122BXRKI037216 for ; Tue, 2 Mar 2021 06:41:14 -0500 Received: from ppma05fra.de.ibm.com (6c.4a.5195.ip4.static.sl-reverse.com [149.81.74.108]) by mx0a-001b2d01.pphosted.com with ESMTP id 371mjp88et-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 02 Mar 2021 06:41:14 -0500 Received: from pps.filterd (ppma05fra.de.ibm.com [127.0.0.1]) by ppma05fra.de.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 122BcBEt010850; Tue, 2 Mar 2021 11:41:11 GMT Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by ppma05fra.de.ibm.com with ESMTP id 3712v50du2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 02 Mar 2021 11:41:11 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 122Bf8OC49086884 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 2 Mar 2021 11:41:08 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8E6ADAE056; Tue, 2 Mar 2021 11:41:08 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 38DA2AE053; Tue, 2 Mar 2021 11:41:08 +0000 (GMT) Received: from ibm-vm.ibmuc.com (unknown [9.145.10.194]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 2 Mar 2021 11:41:08 +0000 (GMT) From: Claudio Imbrenda To: kvm@vger.kernel.org Cc: david@redhat.com, thuth@redhat.com, frankja@linux.ibm.com, cohuck@redhat.com, pmorel@linux.ibm.com, borntraeger@de.ibm.com Subject: [kvm-unit-tests PATCH v4 1/3] s390x: introduce leave_pstate to leave userspace Date: Tue, 2 Mar 2021 12:41:05 +0100 Message-Id: <20210302114107.501837-2-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210302114107.501837-1-imbrenda@linux.ibm.com> References: <20210302114107.501837-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-03-02_03:2021-03-01,2021-03-02 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 suspectscore=0 mlxlogscore=999 spamscore=0 malwarescore=0 phishscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2103020098 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In most testcases, we enter problem state (userspace) just to test if a privileged instruction causes a fault. In some cases, though, we need to test if an instruction works properly in userspace. This means that we do not expect a fault, and we need an orderly way to leave problem state afterwards. This patch introduces a simple system based on the SVC instruction. Signed-off-by: Claudio Imbrenda Acked-by: David Hildenbrand Reviewed-by: Cornelia Huck Reviewed-by: Janosch Frank Reviewed-by: Thomas Huth --- lib/s390x/asm/arch_def.h | 7 +++++++ lib/s390x/interrupt.c | 12 ++++++++++-- 2 files changed, 17 insertions(+), 2 deletions(-) diff --git a/lib/s390x/asm/arch_def.h b/lib/s390x/asm/arch_def.h index 9c4e330a..4cf8eb11 100644 --- a/lib/s390x/asm/arch_def.h +++ b/lib/s390x/asm/arch_def.h @@ -173,6 +173,8 @@ struct cpuid { uint64_t reserved : 15; }; +#define SVC_LEAVE_PSTATE 1 + static inline unsigned short stap(void) { unsigned short cpu_address; @@ -276,6 +278,11 @@ static inline void enter_pstate(void) load_psw_mask(mask); } +static inline void leave_pstate(void) +{ + asm volatile(" svc %0\n" : : "i" (SVC_LEAVE_PSTATE)); +} + static inline int stsi(void *addr, int fc, int sel1, int sel2) { register int r0 asm("0") = (fc << 28) | sel1; diff --git a/lib/s390x/interrupt.c b/lib/s390x/interrupt.c index 1ce36073..d0567845 100644 --- a/lib/s390x/interrupt.c +++ b/lib/s390x/interrupt.c @@ -188,6 +188,14 @@ int unregister_io_int_func(void (*f)(void)) void handle_svc_int(void) { - report_abort("Unexpected supervisor call interrupt: on cpu %d at %#lx", - stap(), lc->svc_old_psw.addr); + uint16_t code = lc->svc_int_code; + + switch (code) { + case SVC_LEAVE_PSTATE: + lc->svc_old_psw.mask &= ~PSW_MASK_PSTATE; + break; + default: + report_abort("Unexpected supervisor call interrupt: code %#x on cpu %d at %#lx", + code, stap(), lc->svc_old_psw.addr); + } }