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.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.08.13 at 14:34, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:

> Monday, August 26, 2013, 1:23:01 PM, you wrote:
> 
>>>>> On 26.08.13 at 13:07, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:
>>> Don't know that for sure, will check if there are any related messages in 
>>> dmesg
>>> I only see it enabling HPET, but i don't see anything about MSI ..
> 
>> The primary indicator, if I'm not mistaken, would be 3 IRQs in
>> /proc/interrupts that show type HPET_MSI (and I suspect you
>> don't see any).
> 
> Ah found out why, another quirk and silently applying:
> 
> /*
>  * HPET MSI on some boards (ATI SB700/SB800) has side effect on
>  * floppy DMA. Disable HPET MSI on such platforms.
>  * See erratum #27 (Misinterpreted MSI Requests May Result in
>  * Corrupted LPC DMA Data) in AMD Publication #46837,
>  * "SB700 Family Product Errata", Rev. 1.0, March 2010.
>  */
> static void force_disable_hpet_msi(struct pci_dev *unused)
> {
>         hpet_msi_disable = 1;
> }
> 
> how many quirks can a machine have ...

Indeed.

In any case - I take this as a sign that I'll submit the earlier
patch as is, without your Tested-by (because you couldn't
really test other than that your box doesn't stall anymore).

Thanks for your patience,
Jan


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