PVH and Linux
The only things needed to make this work as PVH are:
- Get the latest version of Xen (4.10 at least) and compile/install it. See for details
- Get the latest version of Linux (or a reasonable recent one, at least 4.11 is required), see  for details. The steps are:
cd $HOME git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git cd linux
- Compile with CONFIG_XEN_PVH=y:
- Based on your current distro.
cp /boot/config-`uname -r `$HOME/linux/.config make menuconfig
Where one will select
Processor type and features ---> Linux guest support --->Support for running as a PVH guest
This entry requires
Processor type and features ---> Linux guest support --->Xen PVHVM guest support to be set.
- Or from scratch:
You should see: "Support for running as a PVH guest (XEN_PVH) [N/y]" In case you missed it:
Processor type and features ---> Linux guest support --->
Xen guest support (selecting that will now show you):
Support for running as a PVH guest
- If you prefer to edit .config, these should be enabled:
CONFIG_HYPERVISOR_GUEST=y CONFIG_PARAVIRT=y CONFIG_PARAVIRT_GUEST=y CONFIG_PARAVIRT_SPINLOCKS=y CONFIG_XEN=y CONFIG_XEN_PVHVM=y CONFIG_XEN_PVH=y
You will also have to enable the block, network drivers, console, etc which are in different submenus.
- Install it. Usually doing:
make modules_install && install
is suffice. It should generate the initramfs.cpio.gz and the kernel and stash them in /boot directory.
- Launch it with type="pvh" in your guest config (for example):
extra="console=hvc0 earlyprintk=xen initcall_debug debug" kernel="/boot/vmlinuz-4.14+" ramdisk="/boot/initramfs-4.14+.cpio.gz" memory=1024 vcpus=4 name="pvh" vif = [ 'mac=00:0F:4B:00:00:68' ] vfb = [ 'vnc=1, vnclisten=0.0.0.0,vncunused=1'] disk=['phy:/dev/sdb1,xvda,w'] type="pvh" on_reboot="preserve" on_crash="preserve" on_poweroff="preserve
using 'xl'. Xend 'xm' does not have PVH support.
Items that have not been tested extensively or at all:
- Migration (xl save && xl restore for example).
- PCI passthrough
- Running it in dom0 mode (as the patches for that are not yet in Xen upstream).
- Memory ballooning
Things that are broken:
If you encounter errors, please email with the following (please note that the guest config has on_reboot="preserve", on_crash="preserve" - which you should have in your guest config to contain the memory of the guest):
- xl dmesg
- xl list
- xenctx -s $HOME/linux/System.map -f -a -C <domain id>
(xenctx is sometimes found in /usr/lib/xen/bin/xenctx)
- The console output from the guest
- Anything else you can think off.
Stash away your vmlinux file (it is too big to send via email) - as we might need it later on.
That is it!