Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.kernel > #59891

Bug#886491: linux-image-4.9.0-5-amd64: Does not boot as Xen guest in PVH mode

Cross-posted to 2 groups.

Show all headers | View raw

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

Back to linux.debian.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Bug#886491: linux-image-4.9.0-5-amd64: Does not boot as Xen guest in HVM mode jgfrm <frm@gordijn.org> - 2018-01-06 19:30 +0100
  Bug#886491: linux-image-4.9.0-5-amd64: Does not boot as Xen guest in HVM mode Hans van Kranenburg <hans@knorrie.org> - 2018-01-07 00:10 +0100
  Bug#886491: linux-image-4.9.0-5-amd64: Does not boot as Xen guest in HVM mode Hans van Kranenburg <hans@knorrie.org> - 2018-01-07 00:40 +0100
    Bug#886491: linux-image-4.9.0-5-amd64: Does not boot as Xen guest in HVM mode "frm" <frm@gordijn.org> - 2018-01-07 01:00 +0100
  Bug#886491: linux-image-4.9.0-5-amd64: Does not boot as Xen guest in HVM mode Michael Stone <mstone@debian.org> - 2018-01-07 18:50 +0100
    Bug#886491: linux-image-4.9.0-5-amd64: Does not boot as Xen guest in HVM mode Hans van Kranenburg <hans@knorrie.org> - 2018-01-07 20:00 +0100
      Bug#886491: linux-image-4.9.0-5-amd64: Does not boot as Xen guest in PVH mode Michael Stone <mstone@debian.org> - 2018-01-07 20:50 +0100

csiph-web