Date: Wed, 25 Jan 2017 14:58:19 +0300 From: Alexander Nusov <alexander.nusov@nfvexpress.com> To: =?UTF-8?Q?=22Roger_Pau_Monn=C3=A9=22?= <roger.pau@citrix.com> Cc: "Akshay Jaggi" <jaggi@freebsd.org>, "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: <159d57da8bb.e9fea5dc25161.6113276104371162720@nfvexpress.com> In-Reply-To: <20170125115051.sasgqxwgt47p7pwi@dhcp-3-221.uk.xensource.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>
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Cool, many thanks! -- Alex ---- On Wed, 25 Jan 2017 14:50:51 +0300 Roger Pau Monn=C3=A9 <roger.pau@= citrix.com> wrote ---- On Wed, Jan 25, 2017 at 02:20:55PM +0300, Alexander Nusov wrote:=20 > Got it, thanks.=20 >=20 >=20 >=20 > I found a workaround to avoid XENBUS delay in Linux DomUs by adding xe= n_platform_pci =3D 0 to the configuration file.=20 >=20 > 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 wor= ks with QCOW2 overlay images)=20 >=20 =20 On FreeBSD you can boot with QCOW2 by not setting "xen_platform_pci =3D 0" = on the=20 guest config file and adding "hw.xen.disable_pv_disks=3D1" to the=20 /boot/loader.conf file of the guest. This will prevent FreeBSD from using t= he=20 PV disk, but you will still get the PV network interfaces.=20 =20 >=20 > Can you tell me please what is the disadvantage of not using /dev/xen/= vbd devices and drivers in guests? like slow I/O?=20 =20 Slow IO only.=20 =20 > May it lead to data corruption?=20 =20 No.=20
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