Date: Thu, 2 Feb 2017 23:37:02 +0000 From: Akshay Jaggi <jaggi@freebsd.org> Cc: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <roger.pau@citrix.com>, FreeBSD-Xen <freebsd-xen@freebsd.org> Subject: Re: Xen on FreeBSD 11: Cannot boot from QCOW2 properly (waiting for XENBUS, xenbusb_nop_confighook_cb) Message-ID: <CAAeUNVnSqftw2WapWeWLUG7p9v9cm94gA_0wt-j6Wkj77RrSMg@mail.gmail.com> In-Reply-To: <159d57da8bb.e9fea5dc25161.6113276104371162720@nfvexpress.com> References: <A80956E3-F5A1-46BC-86C7-17BBF3DA8FB4@nfvexpress.com> <20170124114444.xdl3qj35lwebkso7@dhcp-3-221.uk.xensource.com> <159d0f04b55.10bbf935114648.7927688075504705395@nfvexpress.com> <20170124165621.iidjypfoyp4ccysi@dhcp-3-221.uk.xensource.com> <CAAeUNV=j5-Sz00PQCvC6rX7QeiEpbhD9uRCFSnqKP-dUFxjB-g@mail.gmail.com> <159d55b6b65.dc9b3b1720453.5847395326743424395@nfvexpress.com> <20170125115051.sasgqxwgt47p7pwi@dhcp-3-221.uk.xensource.com> <159d57da8bb.e9fea5dc25161.6113276104371162720@nfvexpress.com>
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[-Alex] Hi Roger, Did this get solved with the change you submitted to Xen? On 25 January 2017 at 11:58, Alexander Nusov <alexander.nusov@nfvexpress.co= m > wrote: > Cool, many thanks! > > -- > Alex > > ---- On Wed, 25 Jan 2017 14:50:51 +0300 *Roger Pau Monn=C3=A9 > <roger.pau@citrix.com <roger.pau@citrix.com>>* wrote ---- > > On Wed, Jan 25, 2017 at 02:20:55PM +0300, Alexander Nusov wrote: > > Got it, thanks. > > > > > > > > I found a workaround to avoid XENBUS delay in Linux DomUs by adding > xen_platform_pci =3D 0 to the configuration file. > > > > So FreeBSD 11.0 Dom0 can boot Linux guests and Windows Server (FreeBSD > DomU still stuck on xenbusb_nop_confighook_cb) from QCOW2 images (also > works with QCOW2 overlay images) > > > > On FreeBSD you can boot with QCOW2 by not setting "xen_platform_pci =3D 0= " > on the > guest config file and adding "hw.xen.disable_pv_disks=3D1" to the > /boot/loader.conf file of the guest. This will prevent FreeBSD from using > the > PV disk, but you will still get the PV network interfaces. > > > > > Can you tell me please what is the disadvantage of not using > /dev/xen/vbd devices and drivers in guests? like slow I/O? > > Slow IO only. > > > May it lead to data corruption? > > No. > > >
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