Re: [Xen-devel] Xen-unstable PVHdom0: Assertion 'IS_ALIGNED(dfn_x(dfn), (1ul << page_order))' failed at iommu.c:324

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

On 11/02/2019 14:16, Roger Pau Monné wrote:
> On Fri, Feb 08, 2019 at 08:36:54PM +0100, Sander Eikelenboom wrote:
>> On 08/02/2019 17:47, Roger Pau Monné wrote:
>>> On Fri, Feb 08, 2019 at 05:15:22PM +0100, Sander Eikelenboom wrote:
>>>> On 08/02/2019 16:10, Roger Pau Monné wrote:
>>>>> On Fri, Jan 25, 2019 at 07:44:40PM +0100, Sander Eikelenboom wrote:
>>>>>> On 25/01/2019 15:38, Roger Pau Monné wrote:
>>>>>>> On Thu, Jan 24, 2019 at 01:04:31PM +0100, Roger Pau Monné wrote:
>>>>>>> Sorry, fixing that error took longer than expected, and requires
>>>>>>> modifying quite a lot of code, so I'm not sure whether it's something
>>>>>>> to consider for 4.12, I have to think about it.
>>>>>>
>>>>>> I understand, especially since PVH dom0 is marked as experimental.
>>>>>>
>>>>>>> In the meantime, can you please test the following branch:
>>>>>>>
>>>>>>> git://xenbits.xen.org/people/royger/xen.git iommu-fixes-v2
>>>>>>>
>>>>>>> I've been able to successfully create a PVH guest from a PVH dom0 on
>>>>>>> AMD hardware using this branch.
>>>>>>
>>>>>> On the other hand, with a quick test I can confirm that booting a PVH 
>>>>>> guest from a PVH dom0 now works for me as well ! 
>>>>>> (and booting this build as PV dom0, with my normal PVH/HVM mix of guests 
>>>>>> still works, no regressions for me so far)
>>>>
>>>>
>>>>  
>>>>> Sorry for bothering you again, but could you give the following branch
>>>>> a test:
>>>>
>>>> No problem, happy to keep testing until it works and is in good enough 
>>>> shape to get committed.
>>>>
>>>> And fortunately you asked, because unfortunately it doesn't boot as 
>>>> pvhdom0, serial log is attached.
>>>
>>> Thanks!
>>>
>>> Can you try with the following debug patch on top? This should print a
>>> message before hitting the assert, hopefully giving us more
>>> information.
>>>
>>> Roger.
>>
>> Sure, I was also missing a sync_console on the Xen cmdline,
>> serial log attached.
> 
> Thanks, I've got another branch for you to try:
> 
> git://xenbits.xen.org/people/royger/xen.git fixes-4.12-v2.1
> 
> Roger.
> 

Hi Roger,

That boots as pvh dom0 and pvh guests also boot and work !

Hmm another thing that catched my eye now, is Xen relinquishing the
console to the linux kernel in the early kernel boot phase doesn't seem
to work. The screen stays black between Xen relinquishing the console
until a modesettings graphics card driver gets loaded later on, but you
will miss everything from the kernels early boot phase.
Probably because it is relying on something "legacy" which PVH doesn't
provide ?

--
Sander

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