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=-1.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no 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 67C4FC43331 for ; Mon, 30 Mar 2020 17:25:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 35F6A20578 for ; Mon, 30 Mar 2020 17:25:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="oXpgKr1x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729620AbgC3RZZ (ORCPT ); Mon, 30 Mar 2020 13:25:25 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:39798 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728857AbgC3RZY (ORCPT ); Mon, 30 Mar 2020 13:25:24 -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 02UHAhgl037907; Mon, 30 Mar 2020 17:24:59 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 : in-reply-to; s=corp-2020-01-29; bh=G0GXAJNQb5hjmkZ6A5SHmuha8DBnqgARxYVn2+XxaJw=; b=oXpgKr1xcQjXtviSrKoM71zXnZVBpOJISA1c96DCVLpbaWF3Ibb/BfCR9inCLn+5TYFv n1Ef6qxwlG4uKBPODDYbEXupfWoiVeYNS03c1AtZ4p/pV6YjLKwRnbvNWPAJqwc24Q+u fYm0aiDDBd6Uu4mwFXpWU7IWjmg4aEFkYqLcJZDnMF1YFMCBDvRrgyjw1v5FToD/lDWm fFYNxhJ6Z3URWF1lEq2ABb4w6W7s9nheoDgzdt9XP8GAL6Lp1ZIw0Czw27t1+ulegoC6 /3kDIkNwOEoVEU1gXoI1mv86mzUNQ47f5pgwbX/b9h8nonOxg/DEwmklj+6PbS46Vd+9 Dw== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2120.oracle.com with ESMTP id 303aqhbj7v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 30 Mar 2020 17:24:59 +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 02UHKvlO087337; Mon, 30 Mar 2020 17:24:59 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3030.oracle.com with ESMTP id 302g2c907r-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 30 Mar 2020 17:24:59 +0000 Received: from abhmp0005.oracle.com (abhmp0005.oracle.com [141.146.116.11]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 02UHOpMp015670; Mon, 30 Mar 2020 17:24:51 GMT Received: from vbusired-dt (/10.154.170.177) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 30 Mar 2020 10:24:51 -0700 Date: Mon, 30 Mar 2020 12:24:46 -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 00/14] Add AMD SEV guest live migration support Message-ID: <20200330172446.GA584882@vbusired-dt> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9576 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=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003300153 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9576 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 bulkscore=0 phishscore=0 clxscore=1011 malwarescore=0 impostorscore=0 mlxlogscore=999 spamscore=0 mlxscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003300153 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-03-30 06:19:27 +0000, Ashish Kalra wrote: > From: Ashish Kalra > > The series add support for AMD SEV guest live migration commands. To protect the > confidentiality of an SEV protected guest memory while in transit we need to > use the SEV commands defined in SEV API spec [1]. > > SEV guest VMs have the concept of private and shared memory. Private memory > is encrypted with the guest-specific key, while shared memory may be encrypted > with hypervisor key. The commands provided by the SEV FW are meant to be used > for the private memory only. The patch series introduces a new hypercall. > The guest OS can use this hypercall to notify the page encryption status. > If the page is encrypted with guest specific-key then we use SEV command during > the migration. If page is not encrypted then fallback to default. > > The patch adds new ioctls KVM_{SET,GET}_PAGE_ENC_BITMAP. The ioctl can be used > by the qemu to get the page encrypted bitmap. Qemu can consult this bitmap > during the migration to know whether the page is encrypted. > > [1] https://developer.amd.com/wp-content/resources/55766.PDF > > Changes since v5: > - Fix build errors as > Reported-by: kbuild test robot Which upstream tag should I use to apply this patch set? I tried the top of Linus's tree, and I get the following error when I apply this patch set. $ git am PATCH-v6-01-14-KVM-SVM-Add-KVM_SEV-SEND_START-command.mbox Applying: KVM: SVM: Add KVM_SEV SEND_START command Applying: KVM: SVM: Add KVM_SEND_UPDATE_DATA command Applying: KVM: SVM: Add KVM_SEV_SEND_FINISH command Applying: KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command error: patch failed: Documentation/virt/kvm/amd-memory-encryption.rst:375 error: Documentation/virt/kvm/amd-memory-encryption.rst: patch does not apply error: patch failed: arch/x86/kvm/svm.c:7632 error: arch/x86/kvm/svm.c: patch does not apply Patch failed at 0004 KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Thanks, Venu > > Changes since v4: > - Host support has been added to extend KVM capabilities/feature bits to > include a new KVM_FEATURE_SEV_LIVE_MIGRATION, which the guest can > query for host-side support for SEV live migration and a new custom MSR > MSR_KVM_SEV_LIVE_MIG_EN is added for guest to enable the SEV live > migration feature. > - Ensure that _bss_decrypted section is marked as decrypted in the > page encryption bitmap. > - Fixing KVM_GET_PAGE_ENC_BITMAP ioctl to return the correct bitmap > as per the number of pages being requested by the user. Ensure that > we only copy bmap->num_pages bytes in the userspace buffer, if > bmap->num_pages is not byte aligned we read the trailing bits > from the userspace and copy those bits as is. This fixes guest > page(s) corruption issues observed after migration completion. > - Add kexec support for SEV Live Migration to reset the host's > page encryption bitmap related to kernel specific page encryption > status settings before we load a new kernel by kexec. We cannot > reset the complete page encryption bitmap here as we need to > retain the UEFI/OVMF firmware specific settings. > > Changes since v3: > - Rebasing to mainline and testing. > - Adding a new KVM_PAGE_ENC_BITMAP_RESET ioctl, which resets the > page encryption bitmap on a guest reboot event. > - Adding a more reliable sanity check for GPA range being passed to > the hypercall to ensure that guest MMIO ranges are also marked > in the page encryption bitmap. > > Changes since v2: > - reset the page encryption bitmap on vcpu reboot > > Changes since v1: > - Add support to share the page encryption between the source and target > machine. > - Fix review feedbacks from Tom Lendacky. > - Add check to limit the session blob length. > - Update KVM_GET_PAGE_ENC_BITMAP icotl to use the base_gfn instead of > the memory slot when querying the bitmap. > > Ashish Kalra (3): > KVM: x86: Introduce KVM_PAGE_ENC_BITMAP_RESET ioctl > KVM: x86: Introduce new KVM_FEATURE_SEV_LIVE_MIGRATION feature & > Custom MSR. > KVM: x86: Add kexec support for SEV Live Migration. > > Brijesh Singh (11): > KVM: SVM: Add KVM_SEV SEND_START command > KVM: SVM: Add KVM_SEND_UPDATE_DATA command > KVM: SVM: Add KVM_SEV_SEND_FINISH command > KVM: SVM: Add support for KVM_SEV_RECEIVE_START command > KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command > KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command > KVM: x86: Add AMD SEV specific Hypercall3 > KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall > KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl > mm: x86: Invoke hypercall when page encryption status is changed > KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl > > .../virt/kvm/amd-memory-encryption.rst | 120 +++ > Documentation/virt/kvm/api.rst | 62 ++ > Documentation/virt/kvm/cpuid.rst | 4 + > Documentation/virt/kvm/hypercalls.rst | 15 + > Documentation/virt/kvm/msr.rst | 10 + > arch/x86/include/asm/kvm_host.h | 10 + > arch/x86/include/asm/kvm_para.h | 12 + > arch/x86/include/asm/paravirt.h | 10 + > arch/x86/include/asm/paravirt_types.h | 2 + > arch/x86/include/uapi/asm/kvm_para.h | 5 + > arch/x86/kernel/kvm.c | 32 + > arch/x86/kernel/paravirt.c | 1 + > arch/x86/kvm/cpuid.c | 3 +- > arch/x86/kvm/svm.c | 699 +++++++++++++++++- > arch/x86/kvm/vmx/vmx.c | 1 + > arch/x86/kvm/x86.c | 43 ++ > arch/x86/mm/mem_encrypt.c | 69 +- > arch/x86/mm/pat/set_memory.c | 7 + > include/linux/psp-sev.h | 8 +- > include/uapi/linux/kvm.h | 53 ++ > include/uapi/linux/kvm_para.h | 1 + > 21 files changed, 1157 insertions(+), 10 deletions(-) > > -- > 2.17.1 >