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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