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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,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 DD8AFC433E7 for ; Thu, 15 Oct 2020 13:37:31 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3051B2223F for ; Thu, 15 Oct 2020 13:37:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Cvk4qSEd" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3051B2223F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:35748 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kT3Ri-0002g6-7c for qemu-devel@archiver.kernel.org; Thu, 15 Oct 2020 09:37:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50952) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kT3Q0-0000gt-4d for qemu-devel@nongnu.org; Thu, 15 Oct 2020 09:35:44 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:51711) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kT3Px-0008JB-TH for qemu-devel@nongnu.org; Thu, 15 Oct 2020 09:35:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1602768941; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2KO6fi08NfGByxXZfKo9I5VP3nl/DbBwbTw76hSITJQ=; b=Cvk4qSEdOcz93FHN/d4KDLHwVPPNo3VF4x1rrieGsYrdPXA9fAestyjaXkE/CGMJyYK0F+ j23RvMBVSlzf8kofi+kkp7vxMgItDquD6Gs/NSLV7Wo5ESe+sZju4MFJZQp+SweFc3qRW6 2R6ifkLj8kQOomXGrELivvpy5tCPZJ4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-393-t3pzo8Y2PzSqLcRVUCrWHg-1; Thu, 15 Oct 2020 09:35:31 -0400 X-MC-Unique: t3pzo8Y2PzSqLcRVUCrWHg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 762AA5705E; Thu, 15 Oct 2020 13:35:09 +0000 (UTC) Received: from kamzik.brq.redhat.com (unknown [10.40.194.132]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D088A76663; Thu, 15 Oct 2020 13:35:07 +0000 (UTC) Date: Thu, 15 Oct 2020 15:35:05 +0200 From: Andrew Jones To: Marc Zyngier Subject: Re: Kernel patch cases qemu live migration failed. Message-ID: <20201015133505.ubxvbrt6xyvl4362@kamzik.brq.redhat.com> References: <20201015040639.70C6D414009F@webmail.sinamail.sina.com.cn> <7fecfc67da4caab1d677a8b4cd5386b3@kernel.org> MIME-Version: 1.0 In-Reply-To: <7fecfc67da4caab1d677a8b4cd5386b3@kernel.org> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=drjones@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=216.205.24.124; envelope-from=drjones@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/15 02:38:26 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvmarm , xu910121@sina.com, qemu-devel , "Dave.Martin" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, Oct 15, 2020 at 12:26:10PM +0100, Marc Zyngier wrote: > Hi > > Please don't use my arm.com address anymore, nobody reads it... > > On 2020-10-15 05:06, 张东旭 wrote: > > I'm so sorry for disturbing you. > > > > When I apply this kernel patch：KVM: arm64/sve: System register > > context switch and access support > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/kvm/sys_regs.c?id=73433762fcaeb9d59e84d299021c6b15466c96dd > > This patch was only introduced in 5.2, and wasn't supposed to be > backported to anything else. All upstream patches are backport candidates. Welcome to RHEL :-) > > > qemu live migration will failed with messages： > > ​qemu-kvm: Invalid value 233 expecting positive value > > <= 232 > > qemu-kvm: Failed to load cpu:cpreg_vmstate_array_len > > New version kernel exclude ID_AA64ZFR0_EL1 register when host not > > support SVE feature, > > so qemu ioctl kvm(KVM_GET_REG_LIST) will not contain ID_AA64ZFR0_EL1 > > register. > > > > I'm using CentOS Linux kernel, old kernel version：4.18.0-80.11.el8 > > (migration source) > > new kernel version：4.18.0-147.5.el8 (migration destination) > > > > CentOS linux kernel version 4.18.0-111.el8 applied this patch. So > > 4.18.0-147.5.el8 also applied this patch. > > > > Migration source and destination hosts have the same hardware, just > > kernel version is different, > > and the hardware on either side of the migration not support SVE. > > > > Is there some good suggestions，which can make sure old version > > kernel live migration to new version kernel with qemu? > > I['m afraid you should take this with your distribution of > choice, unless you can reproduce the problem with mainline kernels. I'll bet this reproduces when migrating from a mainline pre SVE register filtering kernel to a mainline that does the filtering. I don't have time to test that though. Thanks, drew