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bh=skm5eBgEpFNOoS9xL6QRwSk0rtiELPa8zSm8opC/us4=; b=eSIQLpBdgXftS4TyTE9SYY6wb0+vxwJ72a2M4P9vHYm+F+BkDlixelGfhwq4gJAyKciFld Txig9II2MfSy5eNbMXoeCwYDKZqPT7jpsHaTeEz+BvJoV3IQkj+6WWGcrerj91h+Gtfe9f 5/zBwFzao8LSS8CRa9d4x8OIlzQWMrI= 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-119-giOGfQY5ME-8YyFurnRELw-1; Thu, 29 Oct 2020 21:16:17 -0400 X-MC-Unique: giOGfQY5ME-8YyFurnRELw-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 9D9FC107AD62; Fri, 30 Oct 2020 01:16:14 +0000 (UTC) Received: from [10.72.12.249] (ovpn-12-249.pek2.redhat.com [10.72.12.249]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4D2395B4A9; Fri, 30 Oct 2020 01:15:44 +0000 (UTC) Subject: Re: Out-of-Process Device Emulation session at KVM Forum 2020 To: Paolo Bonzini , Kirti Wankhede , =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= , David Edmondson References: <20201027151400.GA138065@stefanha-x1.localdomain> <20201029164205.GH27369@redhat.com> <14102232-2121-607f-ae7c-40261be8df8a@redhat.com> From: Jason Wang Message-ID: Date: Fri, 30 Oct 2020 09:15:42 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <14102232-2121-607f-ae7c-40261be8df8a@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Received-SPF: pass client-ip=216.205.24.124; envelope-from=jasowang@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/29 21:12:01 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 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, NICE_REPLY_A=-0.261, 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: Elena Ufimtseva , John G Johnson , "mst@redhat.com" , Janosch Frank , Stefan Hajnoczi , qemu-devel , Gerd Hoffmann , Yan Vugenfirer , Jag Raman , Anup Patel , Claudio Imbrenda , Christian Borntraeger , Roman Kagan , Felipe Franciosi , =?UTF-8?Q?Marc-Andr=c3=a9_Lureau?= , Jens Freimann , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , Stefano Garzarella , Eduardo Habkost , Sergio Lopez , Kashyap Chamarthy , Darren Kenny , Liran Alon , Stefan Hajnoczi , =?UTF-8?Q?Alex_Benn=c3=a9e?= , David Gibson , Kevin Wolf , Halil Pasic , Christophe de Dinechin , Thanos Makatos , fam Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2020/10/30 上午2:07, Paolo Bonzini wrote: > On 29/10/20 18:47, Kirti Wankhede wrote: >> On 10/29/2020 10:12 PM, Daniel P. Berrangé wrote: >>> On Thu, Oct 29, 2020 at 04:15:30PM +0000, David Edmondson wrote: >>>> On Thursday, 2020-10-29 at 21:02:05 +08, Jason Wang wrote: >>>> >>>>> 2) Did qemu even try to migrate opaque blobs before? It's probably a >>>>> bad >>>>> design of migration protocol as well. >>>> The TPM emulator backend migrates blobs that are only understood by >>>> swtpm. >>> The separate slirp-helper net backend does the same too IIUC >> When sys mem pages are marked dirty and content is copied to >> destination, content of sys mem is also opaque to QEMU. > Non-opaque RAM might be a bit too much to expect, though. :) > > Paolo > True, and in this case you know you don't need to care about compatibility. Thanks