linux-kernel - Re: [PATCH] PCI: Add Ralink RT2800 broken INTx masking quirk

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Date:	Thu, 07 Jun 2012 11:43:24 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Jan Kiszka <jan.kiszka@....de>
Cc:	Andreas Hartmann <andihartmann@...19freenet.de>,
	bhelgaas@...gle.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] PCI: Add Ralink RT2800 broken INTx masking quirk

On Thu, 2012-06-07 at 19:18 +0200, Jan Kiszka wrote:
> On 2012-06-07 19:05, Alex Williamson wrote:
> > On Thu, 2012-06-07 at 08:18 +0200, Andreas Hartmann wrote:
> >> Hello Alex,
> >>
> >> what about a module parameter to achieve this behaviour manually by
> >> the user without recompiling? I fear, there are much more candidates
> >> out there needing this "feature".
> > 
> > Yeah, that's probably a good idea.  For debugging and letting users have
> > a workaround rather than any kind of regular use.  I'll add a nointxmask
> > to vfio-pci with a description indicating that if it fixes a device to
> > report it for quirking.  Thanks,
> 
> Isn't this controllable on a per-device base from userspace (or is this
> what you mean)? That would nicely align to qemu-kvm's pci-assign
> share_intx property (and may allow to map pci-assign's user-visible
> interface to a vfio backend one day).

No, there's currently no per-device control of this from userspace with
VFIO.  It wouldn't be hard to make use of flags bits in the ioctls to
support it, but I don't just want to move the blacklist from the kernel
out to the user.  Thanks,

Alex

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