From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Williamson <alex.williamson@redhat.com>
Subject: Re: [PATCH 2/2] Device assignment: Fix MSI IRQ affinity setting
Date: Thu, 24 May 2012 17:23:48 -0600
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Cc: Jan Kiszka <jan.kiszka@siemens.com>,
	Richard Weinberger <richard@nod.at>, kvm@vger.kernel.org,
	avi@redhat.com, Marcelo Tosatti <mtosatti@redhat.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	"Michael S. Tsirkin" <mst@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>
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On Fri, 2012-05-25 at 01:01 +0200, Thomas Gleixner wrote:
> So the proper fix is that qemu tells the guest that mask bit is
> supported and catches the mask bit toggling before writing it out to
> the hardware for those devices which do not support it.

We can't necessarily do that, we have to work with the config space
we're give.  Using the smallest possible MSI capability always works.
Adding mask bits may not fit in with the existing capabilities of the
physical device.  Thanks,

Alex