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

[Jan Beulich <jbeulich@xxxxxxxx>]

On 28.10.2019 11:32, Sander Eikelenboom wrote:
> Hi Jan / Andrew,
> 
> While testing the latest xen-unstable and starting an HVM guest with 
> pci-passtrough on my AMD machine,
> my eye catched the following messages in xl dmesg I haven't seen before:
> 
> (XEN) [2019-10-28 10:23:16.372] AMD-Vi: update_paging_mode Try to access 
> pdev_list without aquiring pcidevs_lock.
> (XEN) [2019-10-28 10:24:08.136] AMD-Vi: INVALID_DEV_REQUEST 00000800 8a000000 
> f8000240 000000fd
> 
> Probably something from the AMD iommu rework that got committed lately ?

Not very likely at least for the former; I'll have to look at the
latter in some more detail (and at both to see whether I can spot
a sensible solution).

Jan

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