Re: [Xen-devel] Regression PCI passthrough from 4.5.5 to 4.6.0-rc1

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, Aug 21, 2017 at 09:14:45AM -0600, Jan Beulich wrote:
> >>> On 21.08.17 at 16:49, <roger.pau@xxxxxxxxxx> wrote:
> > Another option is to (ab)use the msi.gflags field to add another flag
> > in order to signal Xen whether the interrupt should be unmasked. This
> > is in line with what you suggest below.
> 
> From a brief look it looks like this would be doable, but the way these
> flags are being communicated is rather ugly (the values used here
> aren't part of the public interface, and hence it wasn't immediately
> clear whether using one of the unused bits would be an option, but
> it looks like it is).

Yes, it's not pretty... Last used bit is 15, hence bit 16 could be
used to signal to Xen whether the interrupt should be unmasked after
binding. I have a half-drafted patch, will finish it now.

Thanks, Roger.

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