Re: [Xen-devel] Xen-unstable: pci-passthrough of device using MSI-X interrupts not working after commit x86/MSI: track host and guest masking separately

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.06.15 at 21:38, <linux@xxxxxxxxxxxxxx> wrote:
> I'm having some trouble with a xhci controller passed through with 
> pci-passthrough to one of my HVM guests.
> It uses MSI-X for interrupts, a bisection turned up the following commit:
> 
>     x86/MSI: track host and guest masking separately
> 
> Although from a first glance it looks as if the controller is correctly 
> initialize during the boot of the HVM guest (no worrying messages in dmesg 
> yet).
> It utterly fails a simple "lsusb" this results in the hang pasted below.
> 
> Other devices  i passthrough which use legacy or MSI interrupts seem to be 
> unaffected.

Odd enough, since I'm having a hard time testing MSI (no suitable
devices), but did a lot of testing with MSI-X.

> Please say so if you need any specific output from Xen debug keys or 
> anything 
> else !

M and i debug key output would be the first thing. I'd suspect host
masking to be wrongly active for some reason.

Jan


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