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 1BA22C636CC for ; Wed, 25 Jan 2023 21:26:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236814AbjAYV0l (ORCPT ); Wed, 25 Jan 2023 16:26:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236703AbjAYV03 (ORCPT ); Wed, 25 Jan 2023 16:26:29 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91EC646145; Wed, 25 Jan 2023 13:26:28 -0800 (PST) Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30PKgeCf022416; Wed, 25 Jan 2023 21:26:26 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=Nr/37ukIO8uowdapXR5ljDDvZaCScgVQP8W+gohOeVc=; b=c32Q40g/2efaW1Y5r11QrRWgPl2XlDxoK1Zs5Szz5aInnL5W3OgBedJZRQx+5OWZCtu1 06T/F6C4VHvD3UFqW8urKPvyFZsLlntYlPMWQvTvJ6XupCBqHw/8RWBYgWhI+BoVEYyq lbm2PLn28wc1+pmxjnSF7yAYvzZbIl4ko8SUhs6r6wSNJGkM7v3wdwSGZgMxl5oXRR4T zUEKBDcB1rK9E6h0P58GB0EgPaJSqQxLYgfrjn0zETr2Nbh/oHAi0helnrfblYNHXccQ yHpS2hFWdzQWFDSF/jG1IqWj134pX1BhvBneuVE4ueDHRNqgTtvz5UhYLcjrr3WWG+EK jA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3naagv1wr0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 25 Jan 2023 21:26:26 +0000 Received: from m0098396.ppops.net (m0098396.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 30PLQPvl007643; Wed, 25 Jan 2023 21:26:25 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 3naagv1wq1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 25 Jan 2023 21:26:25 +0000 Received: from pps.filterd (ppma05fra.de.ibm.com [127.0.0.1]) by ppma05fra.de.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 30PFHcnj032068; Wed, 25 Jan 2023 21:26:22 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma05fra.de.ibm.com (PPS) with ESMTPS id 3n87p64137-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 25 Jan 2023 21:26:22 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 30PLQJe620644442 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 25 Jan 2023 21:26:19 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 11CE120040; Wed, 25 Jan 2023 21:26:19 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D11B620043; Wed, 25 Jan 2023 21:26:18 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 25 Jan 2023 21:26:18 +0000 (GMT) From: Janis Schoetterl-Glausch To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: Janis Schoetterl-Glausch , David Hildenbrand , Jonathan Corbet , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, Paolo Bonzini , Shuah Khan , Sven Schnelle Subject: [PATCH v6 08/14] KVM: s390: Move common code of mem_op functions into functions Date: Wed, 25 Jan 2023 22:26:02 +0100 Message-Id: <20230125212608.1860251-9-scgl@linux.ibm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230125212608.1860251-1-scgl@linux.ibm.com> References: <20230125212608.1860251-1-scgl@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: oc9_ZVLd3GK7XAF-W4eDgrl4PFOMIRa0 X-Proofpoint-GUID: b7nEv1LMXdPwO0E9SimVE5Btofm1T0rI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-25_13,2023-01-25_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 spamscore=0 impostorscore=0 phishscore=0 priorityscore=1501 adultscore=0 bulkscore=0 mlxscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301250187 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The vcpu and vm mem_op ioctl implementations share some functionality. Move argument checking and buffer allocation into functions and call them from both implementations. This allows code reuse in case of additional future mem_op operations. Suggested-by: Janosch Frank Signed-off-by: Janis Schoetterl-Glausch --- arch/s390/kvm/kvm-s390.c | 80 +++++++++++++++++++++------------------- 1 file changed, 42 insertions(+), 38 deletions(-) diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index e4890e04b210..e0dfaa195949 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2764,24 +2764,44 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) return r; } -static bool access_key_invalid(u8 access_key) +static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_flags) { - return access_key > 0xf; + if (mop->flags & ~supported_flags || !mop->size) + return -EINVAL; + if (mop->size > MEM_OP_MAX_SIZE) + return -E2BIG; + if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) { + if (mop->key > 0xf) + return -EINVAL; + } else { + mop->key = 0; + } + return 0; +} + +static void *mem_op_alloc_buf(struct kvm_s390_mem_op *mop) +{ + void *buf; + + if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) + return NULL; + buf = vmalloc(mop->size); + if (!buf) + return ERR_PTR(-ENOMEM); + return buf; } static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) { void __user *uaddr = (void __user *)mop->buf; - u64 supported_flags; void *tmpbuf = NULL; int r, srcu_idx; - supported_flags = KVM_S390_MEMOP_F_SKEY_PROTECTION - | KVM_S390_MEMOP_F_CHECK_ONLY; - if (mop->flags & ~supported_flags || !mop->size) - return -EINVAL; - if (mop->size > MEM_OP_MAX_SIZE) - return -E2BIG; + r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION | + KVM_S390_MEMOP_F_CHECK_ONLY); + if (r) + return r; + /* * This is technically a heuristic only, if the kvm->lock is not * taken, it is not guaranteed that the vm is/remains non-protected. @@ -2793,17 +2813,9 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) */ if (kvm_s390_pv_get_handle(kvm)) return -EINVAL; - if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) { - if (access_key_invalid(mop->key)) - return -EINVAL; - } else { - mop->key = 0; - } - if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { - tmpbuf = vmalloc(mop->size); - if (!tmpbuf) - return -ENOMEM; - } + tmpbuf = mem_op_alloc_buf(mop); + if (IS_ERR(tmpbuf)) + return PTR_ERR(tmpbuf); srcu_idx = srcu_read_lock(&kvm->srcu); @@ -5250,28 +5262,20 @@ static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu, { void __user *uaddr = (void __user *)mop->buf; void *tmpbuf = NULL; - int r = 0; - const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION - | KVM_S390_MEMOP_F_CHECK_ONLY - | KVM_S390_MEMOP_F_SKEY_PROTECTION; + int r; - if (mop->flags & ~supported_flags || mop->ar >= NUM_ACRS || !mop->size) + r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_INJECT_EXCEPTION | + KVM_S390_MEMOP_F_CHECK_ONLY | + KVM_S390_MEMOP_F_SKEY_PROTECTION); + if (r) + return r; + if (mop->ar >= NUM_ACRS) return -EINVAL; - if (mop->size > MEM_OP_MAX_SIZE) - return -E2BIG; if (kvm_s390_pv_cpu_is_protected(vcpu)) return -EINVAL; - if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) { - if (access_key_invalid(mop->key)) - return -EINVAL; - } else { - mop->key = 0; - } - if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { - tmpbuf = vmalloc(mop->size); - if (!tmpbuf) - return -ENOMEM; - } + tmpbuf = mem_op_alloc_buf(mop); + if (IS_ERR(tmpbuf)) + return PTR_ERR(tmpbuf); switch (mop->op) { case KVM_S390_MEMOP_LOGICAL_READ: -- 2.34.1