From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46510) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ukaii-0002ZZ-V1 for qemu-devel@nongnu.org; Thu, 06 Jun 2013 09:59:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Ukaid-0002Xh-Oh for qemu-devel@nongnu.org; Thu, 06 Jun 2013 09:59:16 -0400 Received: from mail-pa0-x22d.google.com ([2607:f8b0:400e:c03::22d]:60849) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ukaid-0002W2-Hu for qemu-devel@nongnu.org; Thu, 06 Jun 2013 09:59:11 -0400 Received: by mail-pa0-f45.google.com with SMTP id bi5so1763729pad.18 for ; Thu, 06 Jun 2013 06:59:10 -0700 (PDT) Message-ID: <51B095AC.3020508@ozlabs.ru> Date: Thu, 06 Jun 2013 23:59:08 +1000 From: Alexey Kardashevskiy MIME-Version: 1.0 References: <51B060BE.8090107@ozlabs.ru> <51B08434.2020908@greensocs.com> In-Reply-To: <51B08434.2020908@greensocs.com> Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [QEMU question] Disk hot plugging without working PCI hotplug - possible? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Frederic Konrad Cc: "qemu-devel@nongnu.org" , "Michael S. Tsirkin" On 06.06.2013 22:44, Frederic Konrad wrote: > On 06/06/2013 12:13, Alexey Kardashevskiy wrote: >> Hi! >> >> For the pseries platform (server PPC64) we do not support PCI hotplug >> yet. >> However we still want to hot plug disks. >> >> As a workaround, we could add multiple SCSI host devices >> (virtio-scsi-pci, >> spapr-vscsi) without any disk attached and later (using qemu console) >> attach drives to them as we do with the "-drive" parameter in the >> command line. >> >> So I enabled CONFIG_PCI_HOTPLUG_OLD=y and tried. >> >> However, drive_add console command works only with PCI what eliminates >> "spapr-vscsi" from the list. Oookay. >> >> Then I tried running qemu with "-device virtio-scsi-pci,id=device0" and >> later doing "drive_add 0 file=virtimg/test1" from the qemu console. This >> time qemu responded with "Device is not a SCSI adapter" what is >> correct as >> nowadays virtio-XXXX-pci devices are not what are they called as they >> simply create underlying virtio-bus, attach a real virtio-XXXX-device >> there >> (which is not PCI) and only then attach disk to non-PCI virtio device. > Hi, > > Seems it's a bug: il should be compatible with the old virtio-scsi-pci. > What's the meaning of the "0" in drive_add command? It is a PCI slot number, the complete address would include a domain and a bus. > Fred >> >> So as I see there is no way to attach a disk to an existing controller in >> already running qemu. >> >> This is how I add disks to qemu now: >> -device virtio-scsi-pci,id=virtioscsi0 \ >> -drive file=virtimg/fc18guest,if=none,id=drive0,readonly=off, >> format=raw,media=disk,werror=stop,rerror=stop \ >> -device scsi-disk,id=scsidisk0,bus=virtioscsi0.0,channel=0, >> scsi-id=0,lun=0,drive=drive0,removable=off \ >> >> I want to only add "-device virtio-scsi-pci,id=virtioscsi0" to the >> command >> line and do the rest from the qemu console. >> >> Am I missing some useful command from qemu console or anything else? >> Thanks! -- With best regards Alexey Kardashevskiy -- icq: 52150396