Re: [Qemu-ppc] [PATCH v2 1/2] ppc/pnv: Add model for Power8 PHB3 PCIe Host bridge

[Benjamin Herrenschmidt]

On Fri, 2018-07-27 at 09:16 +0200, Cédric Le Goater wrote:
> > I'd have to remember how PQ works on P8 ... my gut feeling is that we
> > should resend if P=1 but I'm no 100% certain.
> 
> This is not exactly what the code does. To force a resend, it ignores 
> P but if Q=1, it bails out without doing anything, like a normal trigger 
> would do. So I think that in the resend case we should ignore Q as well.

Not too sure. We might need to swallow the resend if PQ became 01.

I don't know for sure what the HW does. Does it unconditionally resend
or does it re-evaluate the priority etc... it's unclear to me.

But yes, we should still resend if PQ=11

Cheers,
Ben.