From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50120) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YLQow-00082a-DK for qemu-devel@nongnu.org; Wed, 11 Feb 2015 01:30:47 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YLQot-00020I-8i for qemu-devel@nongnu.org; Wed, 11 Feb 2015 01:30:46 -0500 Received: from szxga01-in.huawei.com ([119.145.14.64]:45663) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YLQos-0001xs-IL for qemu-devel@nongnu.org; Wed, 11 Feb 2015 01:30:43 -0500 Message-ID: <54DAF6EE.70009@huawei.com> Date: Wed, 11 Feb 2015 14:30:06 +0800 From: Linhaifeng MIME-Version: 1.0 References: <1423547293-8448-1-git-send-email-haifeng.lin@huawei.com> <20150210084632.GA8397@redhat.com> <54D9DCF8.2000106@huawei.com> <20150210104126.GE9505@redhat.com> <54D9F294.2090000@huawei.com> <20150210120422.GA5339@redhat.com> In-Reply-To: <20150210120422.GA5339@redhat.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH v1 1/2] vhost-user: support SET_MEM_TABLE waite the result of mmap List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael S. Tsirkin" Cc: arei.gonglei@huawei.com, qemu-devel@nongnu.org On 2015/2/10 20:04, Michael S. Tsirkin wrote: > So that's not good. We need a way to negotiate the capability, > we can't just deadlock with legacy slaves. Or add a new message to query slaves' version if slaves not reply we don't wait otherwise if the version as same as QEMU we wait the reply. Mostly the same as iotcl may be all messages need reply. -- Regards, Haifeng