Re: [PATCH v4 0/3] vfio-pci: Support INTx mode re-enabling

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On Wed, Apr 24, 2019 at 10:21:27PM +0800, Leo Yan wrote:
> On Mon, Apr 08, 2019 at 09:27:16AM +0800, Leo Yan wrote:
> > When enable vfio-pci mode for NIC driver on Juno board, the IRQ is
> > failed to forward properly from host to guest, finally root caused this
> > issue is related with kvmtool cannot re-enable INTx mode properly.
> > 
> > So the basic working flow to reproduce this issue is as below:
> > 
> >     Host             Guest
> > -------------  --------------------
> >   INTx mode
> >                  MSI enable failed in NIC driver
> >                  MSI disable in NIC driver
> >                  Switch back to INTx mode --> kvmtool doesn't support
> > 
> > So this patch is to support INTx mode re-enabling; patch 0001 is one
> > minor fixing up for eventfd releasing; patch 0002 introduces a new
> > function vfio_pci_init_intx() which is used to finish INTx one-time
> > initialisation; patch 0003 is the core patch for support INTx mode
> > re-enabling, when kvmtool detects MSI is disabled it rollbacks to INTx
> > mode.
> > 
> > This patch set has been tested on Juno-r2 board.
> > 
> > == Changes for V4 ==
> > * Removed the unnecessary comments in patch 0003 (Jean-Philippe).
> > * Added Jean-Philippe's review tags.
> 
> Could you pick up these 3 patches and merge into kvmtool?  All of them
> has been received reviewing tag from Jean-Philippe.  Thanks.

Sorry, I've fallen behind on kvmtool patches recently. I'll make a note
to queue this lot up tomorrow.

Cheers,

Will



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