Re: [Xen-users] pvgrub2(-like?) booting methods for PVHv2 guests

[Juergen Gross <jgross@xxxxxxxx>]

On 25/01/18 15:12, Hans van Kranenburg wrote:
> On 01/25/2018 02:46 PM, Hans van Kranenburg wrote:
>> On 25/01/2018 13:29, Juergen Gross wrote:
>>> On 25/01/18 13:19, Andy Smith wrote:
>>>> Hi Hans,
>>>>
>>>> On Thu, Jan 25, 2018 at 12:39:56PM +0100, Hans van Kranenburg wrote:
>>>>> And now I get console output and things happen. Only it can't find the 
>>>>> disk.
>>>>
>>>> I was trying similar thing (4.10 and PVH) and also ended up with a
>>>> guest with no block devices. I reported this on grub-devel:
>>>>
>>>>     <http://lists.gnu.org/archive/html/grub-devel/2018-01/msg00018.html>
>>>>
>>>> as I was thinking this was not a Xen problem since same thing boots
>>>> okay outside grub with direct kernel boot.
>>>>
>>>> Juergen did reply and said I needed this kernel patch in the guest:
>>>>
>>>>     <https://lists.xen.org/archives/html/xen-devel/2017-11/msg01681.html>
>>>>
>>>> But I think you have this don't you?
>>
>> Yes, see my earlier mail with all the steps that I did, step 6.
>>
>>> As the ACPI tables are found, I'd say yes. :-)
>>
>> dmesg output is pretty different when I boot directly with the kernel
>> and initrd copied on the dom0.
>>
>> Remember, it's the same kernel/initrd, and without grub in between it
>> boots with all vcpus network and disk.
>>
>> With grub in between, this at least does look suspicious:
>>
>> [    0.032110] PCI: System does not support PCI
> 
> Eh, that's in both, stay awake Hans.
> 
>> And yes, there are also no successful netfront lines.
>>
>> Without grub: http://paste.debian.net/plainh/7120cef2
>> With grub: http://paste.debian.net/plainh/426bed60
> 
> Or the diff between them, which shows what changes when inserting grub
> in between:
> 
> http://paste.debian.net/plainh/52b2d618
> 
> I must admit I don't know too much (yet) about all those changed lines,
> but this next is also a very interesting change?...
> 
> -Booting paravirtualized kernel on Xen PVH
> +Booting paravirtualized kernel on Xen HVM

Aah, yes, this should be the reason for the problems.

I addressed the ACPI problem first. What is missing now is to set PVH
mode when booting via grub.

So please stay tuned...


Juergen


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