Re: [Xen-devel] Xen-unstable: AMD-Vi: update_paging_mode Try to access pdev_list without aquiring pcidevs_lock.

[Jan Beulich <jbeulich@xxxxxxxx>]

On 31.10.2019 09:35, Sander Eikelenboom wrote:
> Platform is perhaps what specific (older AMD 890FX chipset) and I need the 
> bios workaround:
> ivrs_ioapic[6]=00:14.0 iommu=on.

Shouldn't matter here.

> On the other hand, this has ran like this for quite some time.
> 
> I have 3 guests (HVM) for which i use PCI passthrough and 
> for each of those 3 guests I get this message *once* on start of the guest.
>       One guest has a soundcard passed through,
>       One guest has a USB2 card passed through,
>       One guest has a USB3 card passed through.
> 
> Another observation is that both the soundcard and USB2 card
> still seem to function despite the message.

Reality is - this message is benign as long as you don't do PCI
hot (un)plug.

> The USB3 controller goes haywire though (a lot of driver messages in the 
> guest during init).

As a consequence I don't think there's a connection between this
and the observed message.

> I could try to bisect, but that would be somewhere next week before I can get 
> to that.
> 
> At present I run with a tree with as latest commit 
> ee7170822f1fc209f33feb47b268bab35541351d,
> which is stable for me. This predates some of the IOMMU changes and Anthony's 
> QMP work that had
> some issues, but that would be the last known real good point for me to start 
> a bisect from.

I.e. at that point you didn't observe this message, yet?

Jan

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