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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [PATCH] qemu: msi irq allocation api
Date: Thu, 21 May 2009 14:23:20 +0100
References: <20090520162130.GA22109@redhat.com>
	<200905211409.33325.paul@codesourcery.com>
	<20090521131231.GH25309@redhat.com>
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Carsten Otte <cotte@de.ibm.com>, kvm@vger.kernel.org, Rusty Russell <rusty@rustcorp.com.au>, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, Christian Borntraeger <borntraeger@de.ibm.com>, Avi Kivity <avi@redhat.com>

> > MSI provides multiple edge triggered interrupts, whereas traditional mode
> > provides a single level triggered interrupt. My guess is most devices
> > will want to treat these differently anyway.
>
> So, is qemu_send_msi better than qemu_set_irq.

Neither. pci_send_msi, which is a trivial wrapper around stl_phys.

Paul