Date: Fri, 3 Jun 2016 14:10:05 +0200 From: Roger Pau =?iso-8859-1?Q?Monn=E9?= <royger@FreeBSD.org> To: freebsd-xen@FreeBSD.org Cc: freebsd-virt@freebsd.org, xen-devel@lists.xenproject.org Subject: HEADS UP: Imported Xen 4.7 and blkback changes Message-ID: <20160603120921.y5l362zgrhf4fdcb@mac>
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Hello, First of all, this message is only relevant to those that use FreeBSD as Dom0 (host), not as a DomU (guest), so don't panic. I've imported the latest Xen version (4.7-rc4) into the ports tree, it's still not the final version, but it's quite close, so we better start testing it to make sure it works fine with FreeBSD. One of the more relevant changes in 4.7 regarding FreeBSD is the support for block hotplug scripts. This means that we now have the option to use backends different than simple block or regular files, provided that someone writes the proper hotplug scripts to attach them (I've heard there are some iSCSI hotplug scripts around). This however requires changes in blkback, so if you plan to use the Xen 4.7 port, please make sure that you are running a kernel that contains revision r301269 (or any later version). The same also works the other way around, if you update your kernel past r301269, you will have to run Xen 4.7 or else disks are not going to work. Also, and depending on your hardware, you will also need to add hw.pci.mcfg=0 to your /boot/loader.conf file after updating to Xen 4.7. Roger.
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