Date: Wed, 25 Jan 2017 11:50:51 +0000 From: =?iso-8859-1?Q?=22Roger_Pau_Monn=E9=22?= <roger.pau@citrix.com> To: Alexander Nusov <alexander.nusov@nfvexpress.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: <20170125115051.sasgqxwgt47p7pwi@dhcp-3-221.uk.xensource.com> In-Reply-To: <159d55b6b65.dc9b3b1720453.5847395326743424395@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>
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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 = 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 = 0" on the guest config file and adding "hw.xen.disable_pv_disks=1" 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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