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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED 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 7D12AC43331 for ; Fri, 3 Apr 2020 21:49:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 365932080C for ; Fri, 3 Apr 2020 21:49:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="fWh1K0Uw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728126AbgDCVs7 (ORCPT ); Fri, 3 Apr 2020 17:48:59 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:48038 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727829AbgDCVs6 (ORCPT ); Fri, 3 Apr 2020 17:48:58 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 033LcvPl174793; Fri, 3 Apr 2020 21:48:39 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : content-transfer-encoding : in-reply-to; s=corp-2020-01-29; bh=R4OFvOChQLjAMGwJPXTNmdMeH+x3uXolVLopD8/ykpY=; b=fWh1K0Uwwg6tZViwQodLCu7IX2SIqZpOIKDKEBHIS4pDizu4KLDasB1BzxsqvzFPlRpj AHtvQTmyBNu1oT/HqpDljqUMXpk+wMYcu9vnkOOQVpZobPfkWzZzkbvFBavIZVGtD8TZ YCmjg7YQolnVSS+h230ByZtuIrnSYdZDrTaoBOdmFMAJrlXNO+CI3r0+cpczSUVzwHu1 bwtmodFp/9lVrpGuY3ttcqDYZ3m93i+ilf3kfwN0pxhFiuUbrYZMpACnveRYzmxMZrIj bxiT4vCSj9lJcG3KgBOrB2dkQfczXaBLJcU3mBtL304LNJE/GQo+MrF1GzX7m+u6acPQ QA== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2120.oracle.com with ESMTP id 303aqj3ttw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 03 Apr 2020 21:48:39 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 033LbCvV035202; Fri, 3 Apr 2020 21:46:39 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3030.oracle.com with ESMTP id 302g2p0ybv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 03 Apr 2020 21:46:39 +0000 Received: from abhmp0011.oracle.com (abhmp0011.oracle.com [141.146.116.17]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 033LkbIO017820; Fri, 3 Apr 2020 21:46:37 GMT Received: from vbusired-dt (/10.154.116.130) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 03 Apr 2020 21:46:37 +0000 Date: Fri, 3 Apr 2020 16:46:32 -0500 From: Venu Busireddy To: Ashish Kalra Cc: pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, joro@8bytes.org, bp@suse.de, thomas.lendacky@amd.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, rientjes@google.com, srutherford@google.com, luto@kernel.org, brijesh.singh@amd.com Subject: Re: [PATCH v6 11/14] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Message-ID: <20200403214632.GA730481@vbusired-dt> References: <4d4fbe2b9acda82c04834682900acf782182ec23.1585548051.git.ashish.kalra@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4d4fbe2b9acda82c04834682900acf782182ec23.1585548051.git.ashish.kalra@amd.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9580 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 mlxscore=0 adultscore=0 phishscore=0 bulkscore=0 suspectscore=1 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004030168 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9580 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 clxscore=1015 malwarescore=0 impostorscore=0 mlxlogscore=999 spamscore=0 mlxscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 suspectscore=1 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004030168 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-03-30 06:22:55 +0000, Ashish Kalra wrote: > From: Brijesh Singh > > The ioctl can be used to set page encryption bitmap for an > incoming guest. > > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: "H. Peter Anvin" > Cc: Paolo Bonzini > Cc: "Radim Krčmář" > Cc: Joerg Roedel > Cc: Borislav Petkov > Cc: Tom Lendacky > Cc: x86@kernel.org > Cc: kvm@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Brijesh Singh > Signed-off-by: Ashish Kalra Reviewed-by: Venu Busireddy > --- > Documentation/virt/kvm/api.rst | 22 +++++++++++++++++ > arch/x86/include/asm/kvm_host.h | 2 ++ > arch/x86/kvm/svm.c | 42 +++++++++++++++++++++++++++++++++ > arch/x86/kvm/x86.c | 12 ++++++++++ > include/uapi/linux/kvm.h | 1 + > 5 files changed, 79 insertions(+) > > diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst > index 8ad800ebb54f..4d1004a154f6 100644 > --- a/Documentation/virt/kvm/api.rst > +++ b/Documentation/virt/kvm/api.rst > @@ -4675,6 +4675,28 @@ or shared. The bitmap can be used during the guest migration, if the page > is private then userspace need to use SEV migration commands to transmit > the page. > > +4.126 KVM_SET_PAGE_ENC_BITMAP (vm ioctl) > +--------------------------------------- > + > +:Capability: basic > +:Architectures: x86 > +:Type: vm ioctl > +:Parameters: struct kvm_page_enc_bitmap (in/out) > +:Returns: 0 on success, -1 on error > + > +/* for KVM_SET_PAGE_ENC_BITMAP */ > +struct kvm_page_enc_bitmap { > + __u64 start_gfn; > + __u64 num_pages; > + union { > + void __user *enc_bitmap; /* one bit per page */ > + __u64 padding2; > + }; > +}; > + > +During the guest live migration the outgoing guest exports its page encryption > +bitmap, the KVM_SET_PAGE_ENC_BITMAP can be used to build the page encryption > +bitmap for an incoming guest. > > 5. The kvm_run structure > ======================== > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > index 27e43e3ec9d8..d30f770aaaea 100644 > --- a/arch/x86/include/asm/kvm_host.h > +++ b/arch/x86/include/asm/kvm_host.h > @@ -1271,6 +1271,8 @@ struct kvm_x86_ops { > unsigned long sz, unsigned long mode); > int (*get_page_enc_bitmap)(struct kvm *kvm, > struct kvm_page_enc_bitmap *bmap); > + int (*set_page_enc_bitmap)(struct kvm *kvm, > + struct kvm_page_enc_bitmap *bmap); > }; > > struct kvm_arch_async_pf { > diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c > index bae783cd396a..313343a43045 100644 > --- a/arch/x86/kvm/svm.c > +++ b/arch/x86/kvm/svm.c > @@ -7756,6 +7756,47 @@ static int svm_get_page_enc_bitmap(struct kvm *kvm, > return ret; > } > > +static int svm_set_page_enc_bitmap(struct kvm *kvm, > + struct kvm_page_enc_bitmap *bmap) > +{ > + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; > + unsigned long gfn_start, gfn_end; > + unsigned long *bitmap; > + unsigned long sz, i; > + int ret; > + > + if (!sev_guest(kvm)) > + return -ENOTTY; > + > + gfn_start = bmap->start_gfn; > + gfn_end = gfn_start + bmap->num_pages; > + > + sz = ALIGN(bmap->num_pages, BITS_PER_LONG) / 8; > + bitmap = kmalloc(sz, GFP_KERNEL); > + if (!bitmap) > + return -ENOMEM; > + > + ret = -EFAULT; > + if (copy_from_user(bitmap, bmap->enc_bitmap, sz)) > + goto out; > + > + mutex_lock(&kvm->lock); > + ret = sev_resize_page_enc_bitmap(kvm, gfn_end); > + if (ret) > + goto unlock; > + > + i = gfn_start; > + for_each_clear_bit_from(i, bitmap, (gfn_end - gfn_start)) > + clear_bit(i + gfn_start, sev->page_enc_bmap); > + > + ret = 0; > +unlock: > + mutex_unlock(&kvm->lock); > +out: > + kfree(bitmap); > + return ret; > +} > + > static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) > { > struct kvm_sev_cmd sev_cmd; > @@ -8161,6 +8202,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = { > > .page_enc_status_hc = svm_page_enc_status_hc, > .get_page_enc_bitmap = svm_get_page_enc_bitmap, > + .set_page_enc_bitmap = svm_set_page_enc_bitmap, > }; > > static int __init svm_init(void) > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 3c3fea4e20b5..05e953b2ec61 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -5238,6 +5238,18 @@ long kvm_arch_vm_ioctl(struct file *filp, > r = kvm_x86_ops->get_page_enc_bitmap(kvm, &bitmap); > break; > } > + case KVM_SET_PAGE_ENC_BITMAP: { > + struct kvm_page_enc_bitmap bitmap; > + > + r = -EFAULT; > + if (copy_from_user(&bitmap, argp, sizeof(bitmap))) > + goto out; > + > + r = -ENOTTY; > + if (kvm_x86_ops->set_page_enc_bitmap) > + r = kvm_x86_ops->set_page_enc_bitmap(kvm, &bitmap); > + break; > + } > default: > r = -ENOTTY; > } > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index db1ebf85e177..b4b01d47e568 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -1489,6 +1489,7 @@ struct kvm_enc_region { > #define KVM_S390_CLEAR_RESET _IO(KVMIO, 0xc4) > > #define KVM_GET_PAGE_ENC_BITMAP _IOW(KVMIO, 0xc5, struct kvm_page_enc_bitmap) > +#define KVM_SET_PAGE_ENC_BITMAP _IOW(KVMIO, 0xc6, struct kvm_page_enc_bitmap) > > /* Secure Encrypted Virtualization command */ > enum sev_cmd_id { > -- > 2.17.1 >