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=-8.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 AE95FC433E7 for ; Thu, 15 Oct 2020 14:06:39 +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 01C7620663 for ; Thu, 15 Oct 2020 14:06:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="aYovgX3/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 01C7620663 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:51798 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kT3tt-0000Ly-Oc for qemu-devel@archiver.kernel.org; Thu, 15 Oct 2020 10:06:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55036) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kT3gO-0003nC-Nn for qemu-devel@nongnu.org; Thu, 15 Oct 2020 09:52:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:33058) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kT3gM-00023i-Js for qemu-devel@nongnu.org; Thu, 15 Oct 2020 09:52:40 -0400 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C4B422222B; Thu, 15 Oct 2020 13:52:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602769956; bh=xarXKYZ8s+xHzOaOdBDdrKmal0xGW3EEb9e3ttVwQAg=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=aYovgX3/go3eG/ZbCmpQGRKnh9z5m7oWFIjx02kMEtmPXNzYE1JjO31kXpusbaeuU Rf2KrjwgM5OFSnhgQbmMevkh9IJM6bEp3jvhorN7Twx8caRis8VNIlFS2v5KmPH2vR 8Gzar2oZW80L6/oh0qW1Crk98JSJAYlz9/aCGkdE= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1kT3gI-001OiW-M4; Thu, 15 Oct 2020 14:52:34 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Date: Thu, 15 Oct 2020 14:52:34 +0100 From: Marc Zyngier To: Andrew Jones Subject: Re: Kernel patch cases qemu live migration failed. In-Reply-To: <20201015133505.ubxvbrt6xyvl4362@kamzik.brq.redhat.com> References: <20201015040639.70C6D414009F@webmail.sinamail.sina.com.cn> <7fecfc67da4caab1d677a8b4cd5386b3@kernel.org> <20201015133505.ubxvbrt6xyvl4362@kamzik.brq.redhat.com> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <16400df4bdf79b8b22e824eb1a20e2b4@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: drjones@redhat.com, xu910121@sina.com, qemu-devel@nongnu.org, dave.martin@arm.com, kvmarm@lists.cs.columbia.edu X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Received-SPF: pass client-ip=198.145.29.99; envelope-from=maz@kernel.org; helo=mail.kernel.org X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/15 09:52:37 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -70 X-Spam_score: -7.1 X-Spam_bar: ------- X-Spam_report: (-7.1 / 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_HI=-5, 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 2020-10-15 14:35, Andrew Jones wrote: > 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 :-) Great! RHEL gets to keep the pieces! ;-) > >> >> > 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. Probably. I'm not really sure where to find SVE HW though, other than emulation... M. -- Jazz is not dead. It just smells funny...