Re: [Xen-devel] [xen-unstable] Commit 2ca9fbd739b8a72b16dd790d0fff7b75f5488fb8 AMD IOMMU: allocate IRTE entries instead of using a static mapping, makes dom0 boot process stall several times.

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Monday, August 26, 2013, 1:29:12 PM, you wrote:

>>>> On 26.08.13 at 13:21, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:

>> Monday, August 26, 2013, 12:33:16 PM, you wrote:
>> 
>>>>>> On 26.08.13 at 11:51, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:
>>>> Monday, August 26, 2013, 8:59:24 AM, you wrote:
>>>>> It also alters a bogus comparison in the original code (note the
>>>>> extra ! in (!msi_desc->hpet_id != hpet_sbdf.id)) - I can't see why
>>>>> it would have been coded that way, but double checking the
>>>>> output with "iommu=debug" for the absence of the respective
>>>>> message would be very helpful.
>>>> 
>>>> With the patch below i end up with:
>>>> 
>>>> (XEN) [2013-08-26 09:42:53] AMD-Vi: Failed to setup HPET MSI remapping: 
>>>> Wrong 
>>>> HPET  msi_desc->hpet_id: 0x2  hpet_sbdf.id: 0
>>>> (XEN) [2013-08-26 09:42:53] AMD-Vi: Failed to setup HPET MSI remapping: 
>>>> Wrong 
>>>> HPET  msi_desc->hpet_id: 0x2  hpet_sbdf.id: 0
>>>> (XEN) [2013-08-26 09:42:53] AMD-Vi: Failed to setup HPET MSI remapping: 
>>>> Wrong 
>>>> HPET  msi_desc->hpet_id: 0x2  hpet_sbdf.id: 0
>> 
>>> So that's exactly the bogus comparison mentioned above. And
>>> you say that you do have working HPET MSI on the native kernel,
>>> without any extra overrides? I ask because I don't see any
>>> workarounds for apparently broken firmware like here...
>> 
>>> To be sure it's the firmware, could you
>>> - send the dump of the ACPI HPET table
>>> - try restoring the bogus "!"
>> 
>> acpidump attached ..

> So as already suspected HPET and IVRS tables conflict with one
> another in the IDs used for the (apparently) single HPET in the
> system.

Yes that was wat i meant with another firmware glitch, masking the fact that 
your fix seems actually ok.

Will see if i can flash a newer bios.
All of them have iommu problems, so i am/was stuck on a very old one that at 
least semi-works, but perhaps with the new overrides i can get a more recent 
one to boot and function now.

Thx so far !

--
Sander

> Jan




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