On Sun, Jan 07, 2018 at 07:49:15PM +0100, Hans van Kranenburg wrote:
On 01/07/2018 06:42 PM, Michael Stone wrote:
retitle 886491 linux-image-4.9.0-5-amd64: Does not boot as Xen guest in
PVH mode
thanks
HVM and PVH are two different modes. The fix suggested in this bug
report (commenting out pvh=1 in the conf file) points to the problem
being the latter. I can confirm that PVH guests fail to boot using
4.9.0-5 and a conf file that boots fine with -3.
I don't understand this line:
It is running but only in pv mode, not in hvm mode
(commenting out pvh=1 in the guest config file).
Yes, pv, pvh and hvm are all different things, but I don't understand
what reporter is actually doing. What scenario does commenting something
out cause?
And as far as I know using PVH is not supported with a Xen before 4.10?
The default is pvh=0, so if you comment out pvh=1 it drops to pv mode.
xen changed the pvh implementation between 4.8 & 4.9, and made it fully
supported in 4.10. The problem is that a configuration that worked in
stretch suddenly stops working when installing a security update. I'm
not sure that's reasonably fixable given the changes that have been made
in the xen pvh mode in both the xen and linux kernel code, but maybe it
would be possible to put in a debconf warning along the lines of "if you
install this kernel and reboot the machine won't come back up unless you
reconfigure the xen guest mode" so people would know that they need to
reconfigure things.
Mike Stone
