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=-6.9 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 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 ED957C43331 for ; Thu, 2 Apr 2020 22:32:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B084A2073B for ; Thu, 2 Apr 2020 22:32:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="m+Syx9aM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389833AbgDBWcK (ORCPT ); Thu, 2 Apr 2020 18:32:10 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:48664 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388218AbgDBWcK (ORCPT ); Thu, 2 Apr 2020 18:32:10 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 032MRvg1040823; Thu, 2 Apr 2020 22:31:51 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=SZocQty41xyA03Ov0i0QqgwxuviOkjnJM8QExzU6N2g=; b=m+Syx9aMUfJ2fURsjo/qLKkSNfgsK6Mho//wZXvr6WoMcfNCLYkuAcZ4kMgPPyW4LTaT L1px0J4q6J34c8IZlPlSEBkqmX0KgB9es4ZuhGvpokPclR93UNblcYxPN1BiXIB6UC0E ZAB95qXMAyIYme3HeSuf9gD/5EwyzmzRpd1dXIlg4wOs4Yt5zkLa8Ibu+WLSpbOup3G1 x1TLESB5OM4DwWGWbq82xm2OwAZ+3iYlaScaqL7zndyLnMW/zd0cWKzwi6X5rAF+qldX 0jWTIwHWx0z06pqh/G44gAm6XyHdRfvO/LJPtucSjEWTyEJ501PiYBecAhXJdUiiqyy1 Ug== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2130.oracle.com with ESMTP id 303ceve6e9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2020 22:31:50 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 032MSKfl011576; Thu, 2 Apr 2020 22:29:49 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserp3030.oracle.com with ESMTP id 302g4w927r-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 02 Apr 2020 22:29:49 +0000 Received: from abhmp0009.oracle.com (abhmp0009.oracle.com [141.146.116.15]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 032MTmW4004576; Thu, 2 Apr 2020 22:29:48 GMT Received: from vbusired-dt (/10.154.166.66) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 02 Apr 2020 15:29:48 -0700 Date: Thu, 2 Apr 2020 17:29:43 -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 05/14] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Message-ID: <20200402222943.GA659464@vbusired-dt> References: <871a1e89a4dff59f50d9c264c6d9a4cfd0eab50f.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: <871a1e89a4dff59f50d9c264c6d9a4cfd0eab50f.1585548051.git.ashish.kalra@amd.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9579 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 bulkscore=0 suspectscore=5 mlxscore=0 spamscore=0 malwarescore=0 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004020165 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9579 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 adultscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 spamscore=0 malwarescore=0 suspectscore=5 mlxscore=0 impostorscore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004020165 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-03-30 06:21:20 +0000, Ashish Kalra wrote: > From: Brijesh Singh > > The command is used for copying the incoming buffer into the > SEV guest memory space. > > 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 > --- > .../virt/kvm/amd-memory-encryption.rst | 24 ++++++ > arch/x86/kvm/svm.c | 79 +++++++++++++++++++ > include/uapi/linux/kvm.h | 9 +++ > 3 files changed, 112 insertions(+) > > diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst > index ef1f1f3a5b40..554aa33a99cc 100644 > --- a/Documentation/virt/kvm/amd-memory-encryption.rst > +++ b/Documentation/virt/kvm/amd-memory-encryption.rst > @@ -351,6 +351,30 @@ On success, the 'handle' field contains a new handle and on error, a negative va > > For more details, see SEV spec Section 6.12. > > +14. KVM_SEV_RECEIVE_UPDATE_DATA > +---------------------------- > + > +The KVM_SEV_RECEIVE_UPDATE_DATA command can be used by the hypervisor to copy > +the incoming buffers into the guest memory region with encryption context > +created during the KVM_SEV_RECEIVE_START. > + > +Parameters (in): struct kvm_sev_receive_update_data > + > +Returns: 0 on success, -negative on error > + > +:: > + > + struct kvm_sev_launch_receive_update_data { > + __u64 hdr_uaddr; /* userspace address containing the packet header */ > + __u32 hdr_len; > + > + __u64 guest_uaddr; /* the destination guest memory region */ > + __u32 guest_len; > + > + __u64 trans_uaddr; /* the incoming buffer memory region */ > + __u32 trans_len; > + }; > + > References > ========== > > diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c > index 038b47685733..5fc5355536d7 100644 > --- a/arch/x86/kvm/svm.c > +++ b/arch/x86/kvm/svm.c > @@ -7497,6 +7497,82 @@ static int sev_receive_start(struct kvm *kvm, struct kvm_sev_cmd *argp) > return ret; > } > > +static int sev_receive_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp) > +{ > + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; > + struct kvm_sev_receive_update_data params; > + struct sev_data_receive_update_data *data; > + void *hdr = NULL, *trans = NULL; > + struct page **guest_page; > + unsigned long n; > + int ret, offset; > + > + if (!sev_guest(kvm)) > + return -EINVAL; > + > + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, > + sizeof(struct kvm_sev_receive_update_data))) > + return -EFAULT; > + > + if (!params.hdr_uaddr || !params.hdr_len || > + !params.guest_uaddr || !params.guest_len || > + !params.trans_uaddr || !params.trans_len) > + return -EINVAL; > + > + /* Check if we are crossing the page boundary */ > + offset = params.guest_uaddr & (PAGE_SIZE - 1); > + if ((params.guest_len + offset > PAGE_SIZE)) > + return -EINVAL; > + > + hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len); > + if (IS_ERR(hdr)) > + return PTR_ERR(hdr); > + > + trans = psp_copy_user_blob(params.trans_uaddr, params.trans_len); > + if (IS_ERR(trans)) { > + ret = PTR_ERR(trans); > + goto e_free_hdr; > + } > + > + ret = -ENOMEM; > + data = kzalloc(sizeof(*data), GFP_KERNEL); > + if (!data) > + goto e_free_trans; > + > + data->hdr_address = __psp_pa(hdr); > + data->hdr_len = params.hdr_len; > + data->trans_address = __psp_pa(trans); > + data->trans_len = params.trans_len; > + > + /* Pin guest memory */ > + ret = -EFAULT; > + guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK, > + PAGE_SIZE, &n, 0); > + if (!guest_page) > + goto e_free; > + > + /* The RECEIVE_UPDATE_DATA command requires C-bit to be always set. */ > + data->guest_address = (page_to_pfn(guest_page[0]) << PAGE_SHIFT) + > + offset; > + data->guest_address |= sev_me_mask; > + data->guest_len = params.guest_len; > + data->handle = sev->handle; > + > + ret = sev_issue_cmd(kvm, SEV_CMD_RECEIVE_UPDATE_DATA, data, > + &argp->error); > + > + sev_unpin_memory(kvm, guest_page, n); > + > +e_free: > + kfree(data); > +e_free_trans: > + kfree(trans); > +e_free_hdr: > + kfree(hdr); > + > + return ret; > +} > + > static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) > { > struct kvm_sev_cmd sev_cmd; > @@ -7553,6 +7629,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) > case KVM_SEV_RECEIVE_START: > r = sev_receive_start(kvm, &sev_cmd); > break; > + case KVM_SEV_RECEIVE_UPDATE_DATA: > + r = sev_receive_update_data(kvm, &sev_cmd); > + break; > default: > r = -EINVAL; > goto out; > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index 74764b9db5fa..4e80c57a3182 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -1588,6 +1588,15 @@ struct kvm_sev_receive_start { > __u32 session_len; > }; > > +struct kvm_sev_receive_update_data { > + __u64 hdr_uaddr; > + __u32 hdr_len; > + __u64 guest_uaddr; > + __u32 guest_len; > + __u64 trans_uaddr; > + __u32 trans_len; > +}; > + > #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0) > #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1) > #define KVM_DEV_ASSIGN_MASK_INTX (1 << 2) > -- > 2.17.1 >