From patchwork Thu Nov 3 15:26:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pierre Morel X-Patchwork-Id: 13030396 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 A7796C4321E for ; Thu, 3 Nov 2022 15:27:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232174AbiKCP1F (ORCPT ); Thu, 3 Nov 2022 11:27:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36588 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232222AbiKCP0w (ORCPT ); Thu, 3 Nov 2022 11:26:52 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A802A1A380; Thu, 3 Nov 2022 08:26:39 -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 2A3F8SCi023004; Thu, 3 Nov 2022 15:26:39 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=nTSfA3vA3C3goCpfE07fgAUyTWXE8OhJmkr8o5W1RVI=; b=XyBis4nJlFcXgE6OHKbuQbDkATOZLXOwelPJlTscUULfWNN2sIz9M8l6id8xxCPqU4j2 yHhslHinyFWboGo5MNoBtipiGce5QFcOqG/wuBjIslLt5dgCCOUQGSmWvouRQZtEjBGh uZWI1kdrcuOBcngTz01d7VLr8jacWE5Utltxabp5M6Y/PHVzRmNIjXJNppqyUZclj0r5 CXAqSlEdd6Mq/7ILufOh4XPVFHsMsMzHniKeSyNbjjyCnGhU3MDhTw0dNNw3bg7NsbXg kRDQNaEDfRGR0VF4g5vfmcUNAuMVZbUgvTfePQw6wcHcXcMIn888mDHjUSps61lHPMcQ 6w== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3kme16624c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Nov 2022 15:26:38 +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 2A3F8onB027746; Thu, 3 Nov 2022 15:26:38 GMT Received: from ppma03fra.de.ibm.com (6b.4a.5195.ip4.static.sl-reverse.com [149.81.74.107]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3kme16623a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Nov 2022 15:26:38 +0000 Received: from pps.filterd (ppma03fra.de.ibm.com [127.0.0.1]) by ppma03fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 2A3F5bF9019966; Thu, 3 Nov 2022 15:26:36 GMT Received: from b06avi18878370.portsmouth.uk.ibm.com (b06avi18878370.portsmouth.uk.ibm.com [9.149.26.194]) by ppma03fra.de.ibm.com with ESMTP id 3kgut8pqsq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Nov 2022 15:26:35 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 2A3FR9IJ47841772 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 3 Nov 2022 15:27:09 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 72B334C044; Thu, 3 Nov 2022 15:26:32 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0E07C4C040; Thu, 3 Nov 2022 15:26:32 +0000 (GMT) Received: from li-c6ac47cc-293c-11b2-a85c-d421c8e4747b.ibm.com (unknown [9.152.222.245]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 3 Nov 2022 15:26:31 +0000 (GMT) From: Pierre Morel To: kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, cohuck@redhat.com, david@redhat.com, thuth@redhat.com, imbrenda@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, svens@linux.ibm.com Subject: [PATCH v3 1/1] KVM: s390: vsie: clarifications on setting the APCB Date: Thu, 3 Nov 2022 16:26:31 +0100 Message-Id: <20221103152631.17393-2-pmorel@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20221103152631.17393-1-pmorel@linux.ibm.com> References: <20221103152631.17393-1-pmorel@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: UCm55n12ceFyJO0_vwtzYEZvNXxL__r9 X-Proofpoint-ORIG-GUID: zdGpG523Ir0mfdl0o1FvzA-4rGaFJRkY X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-03_04,2022-11-03_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 mlxscore=0 phishscore=0 lowpriorityscore=0 mlxlogscore=999 bulkscore=0 clxscore=1015 adultscore=0 priorityscore=1501 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211030101 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The APCB is part of the CRYCB. The calculation of the APCB origin can be done by adding the APCB offset to the CRYCB origin. Current code makes confusing transformations, converting the CRYCB origin to a pointer to calculate the APCB origin. Let's make things simpler and keep the CRYCB origin to make these calculations. Signed-off-by: Pierre Morel Reviewed-by: Claudio Imbrenda --- arch/s390/kvm/vsie.c | 50 +++++++++++++++++++++++++------------------- 1 file changed, 29 insertions(+), 21 deletions(-) diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 94138f8f0c1c..07a54332140a 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -138,11 +138,15 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) } /* Copy to APCB FORMAT1 from APCB FORMAT0 */ static int setup_apcb10(struct kvm_vcpu *vcpu, struct kvm_s390_apcb1 *apcb_s, - unsigned long apcb_o, struct kvm_s390_apcb1 *apcb_h) + unsigned long crycb_gpa, struct kvm_s390_apcb1 *apcb_h) { struct kvm_s390_apcb0 tmp; + unsigned long apcb_gpa; - if (read_guest_real(vcpu, apcb_o, &tmp, sizeof(struct kvm_s390_apcb0))) + apcb_gpa = crycb_gpa + offsetof(struct kvm_s390_crypto_cb, apcb0); + + if (read_guest_real(vcpu, apcb_gpa, &tmp, + sizeof(struct kvm_s390_apcb0))) return -EFAULT; apcb_s->apm[0] = apcb_h->apm[0] & tmp.apm[0]; @@ -157,15 +161,19 @@ static int setup_apcb10(struct kvm_vcpu *vcpu, struct kvm_s390_apcb1 *apcb_s, * setup_apcb00 - Copy to APCB FORMAT0 from APCB FORMAT0 * @vcpu: pointer to the virtual CPU * @apcb_s: pointer to start of apcb in the shadow crycb - * @apcb_o: pointer to start of original apcb in the guest2 + * @crycb_gpa: guest physical address to start of original guest crycb * @apcb_h: pointer to start of apcb in the guest1 * * Returns 0 and -EFAULT on error reading guest apcb */ static int setup_apcb00(struct kvm_vcpu *vcpu, unsigned long *apcb_s, - unsigned long apcb_o, unsigned long *apcb_h) + unsigned long crycb_gpa, unsigned long *apcb_h) { - if (read_guest_real(vcpu, apcb_o, apcb_s, + unsigned long apcb_gpa; + + apcb_gpa = crycb_gpa + offsetof(struct kvm_s390_crypto_cb, apcb0); + + if (read_guest_real(vcpu, apcb_gpa, apcb_s, sizeof(struct kvm_s390_apcb0))) return -EFAULT; @@ -178,16 +186,20 @@ static int setup_apcb00(struct kvm_vcpu *vcpu, unsigned long *apcb_s, * setup_apcb11 - Copy the FORMAT1 APCB from the guest to the shadow CRYCB * @vcpu: pointer to the virtual CPU * @apcb_s: pointer to start of apcb in the shadow crycb - * @apcb_o: pointer to start of original guest apcb + * @crycb_gpa: guest physical address to start of original guest crycb * @apcb_h: pointer to start of apcb in the host * * Returns 0 and -EFAULT on error reading guest apcb */ static int setup_apcb11(struct kvm_vcpu *vcpu, unsigned long *apcb_s, - unsigned long apcb_o, + unsigned long crycb_gpa, unsigned long *apcb_h) { - if (read_guest_real(vcpu, apcb_o, apcb_s, + unsigned long apcb_gpa; + + apcb_gpa = crycb_gpa + offsetof(struct kvm_s390_crypto_cb, apcb1); + + if (read_guest_real(vcpu, apcb_gpa, apcb_s, sizeof(struct kvm_s390_apcb1))) return -EFAULT; @@ -200,7 +212,7 @@ static int setup_apcb11(struct kvm_vcpu *vcpu, unsigned long *apcb_s, * setup_apcb - Create a shadow copy of the apcb. * @vcpu: pointer to the virtual CPU * @crycb_s: pointer to shadow crycb - * @crycb_o: pointer to original guest crycb + * @crycb_gpa: guest physical address of original guest crycb * @crycb_h: pointer to the host crycb * @fmt_o: format of the original guest crycb. * @fmt_h: format of the host crycb. @@ -211,50 +223,46 @@ static int setup_apcb11(struct kvm_vcpu *vcpu, unsigned long *apcb_s, * Return 0 or an error number if the guest and host crycb are incompatible. */ static int setup_apcb(struct kvm_vcpu *vcpu, struct kvm_s390_crypto_cb *crycb_s, - const u32 crycb_o, + const u32 crycb_gpa, struct kvm_s390_crypto_cb *crycb_h, int fmt_o, int fmt_h) { - struct kvm_s390_crypto_cb *crycb; - - crycb = (struct kvm_s390_crypto_cb *) (unsigned long)crycb_o; - switch (fmt_o) { case CRYCB_FORMAT2: - if ((crycb_o & PAGE_MASK) != ((crycb_o + 256) & PAGE_MASK)) + if ((crycb_gpa & PAGE_MASK) != ((crycb_gpa + 256) & PAGE_MASK)) return -EACCES; if (fmt_h != CRYCB_FORMAT2) return -EINVAL; return setup_apcb11(vcpu, (unsigned long *)&crycb_s->apcb1, - (unsigned long) &crycb->apcb1, + crycb_gpa, (unsigned long *)&crycb_h->apcb1); case CRYCB_FORMAT1: switch (fmt_h) { case CRYCB_FORMAT2: return setup_apcb10(vcpu, &crycb_s->apcb1, - (unsigned long) &crycb->apcb0, + crycb_gpa, &crycb_h->apcb1); case CRYCB_FORMAT1: return setup_apcb00(vcpu, (unsigned long *) &crycb_s->apcb0, - (unsigned long) &crycb->apcb0, + crycb_gpa, (unsigned long *) &crycb_h->apcb0); } break; case CRYCB_FORMAT0: - if ((crycb_o & PAGE_MASK) != ((crycb_o + 32) & PAGE_MASK)) + if ((crycb_gpa & PAGE_MASK) != ((crycb_gpa + 32) & PAGE_MASK)) return -EACCES; switch (fmt_h) { case CRYCB_FORMAT2: return setup_apcb10(vcpu, &crycb_s->apcb1, - (unsigned long) &crycb->apcb0, + crycb_gpa, &crycb_h->apcb1); case CRYCB_FORMAT1: case CRYCB_FORMAT0: return setup_apcb00(vcpu, (unsigned long *) &crycb_s->apcb0, - (unsigned long) &crycb->apcb0, + crycb_gpa, (unsigned long *) &crycb_h->apcb0); } }