From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52092) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ceHxW-00069j-24 for qemu-devel@nongnu.org; Thu, 16 Feb 2017 04:02:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ceHxS-0001Ui-4s for qemu-devel@nongnu.org; Thu, 16 Feb 2017 04:02:38 -0500 Received: from prv-mh.provo.novell.com ([137.65.248.74]:57197) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ceHxR-0001Tk-R9 for qemu-devel@nongnu.org; Thu, 16 Feb 2017 04:02:34 -0500 Message-Id: <58A5DB2002000062000D1075@prv-mh.provo.novell.com> Date: Thu, 16 Feb 2017 02:02:24 -0700 From: "Lin Ma" References: <58A4707602000062000D0393@prv-mh.provo.novell.com> <20170215153306.GF16064@stefanha-x1.localdomain> <58A5C23202000062000D0FCB@prv-mh.provo.novell.com> In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] =?utf-8?b?562U5aSN77yaIFJlOiBbUkZDXSB2aXJ0aW8tZmM6?= =?utf-8?q?_draft_idea_of_virtual_fibre_channel_HBA?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paolo Bonzini Cc: qemu-devel@nongnu.org, Fam Zheng , mst@redhat.com, stefanha@redhat.com, Zhiqiang Zhou , hare@suse.de >>> Paolo Bonzini 2/16/2017 4:39 =E4=B8=8B=E5=8D=88 = >>> > > >On 16/02/2017 08:16, Lin Ma wrote: >>> What are the benefits of having FC access from the guest? >>=20 >> Actually, I havn't dug it too much, Just thought that from virtualizatio= n's >> perspective, when interact with FC storage, having complete FC access >> from the guest is the way it should use. > >How much of this requires a completely new spec? Could we get enough of >the benefit (e.g. the ability to issue rescans or LIPs on the host) by >extending virtio-scsi? I understand, It needs too much stuff for building such an all new = device.=20 Furthermore, from performance's perspective, Extending virtio-scsi way = doesn't involve in the fc fabric level, leave it to physical HBA to handle, may = get better performance. =20 Lin