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From: Jan Kiszka <jan.kiszka@web.de>
To: "Michael S. Tsirkin" <mst@redhat.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	kvm <kvm@vger.kernel.org>
Subject: Device assignment, shared IRQs, uio_pci_generic
Date: Sat, 30 Oct 2010 17:58:30 +0200	[thread overview]
Message-ID: <4CCC40A6.7080008@web.de> (raw)

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Hi all,

trying to pass some host device to a KVM guest (for driver hacking), I
ran into massive IRQ sharing issues on the host. Classic device
assignment refuses to work in this case. I remembered uio_pci_generic,
which I thought was once designed to resolve this conflict. But it isn't
used by KVM or qemu, is it?

So I crossed fingers and hacked IRQF_SHARED into
assigned_device_enable_host_intx. Effect as expected: assignment work,
host gets massive hick-ups (the graphic adapter is another user of this
line...).

Are there already VFIO patches ready for testing that work with shared
IRQs as well? And/or would it make sense to integrate IRQ sharing via
PCI-level IRQ masking to the KVM core until VFIO becomes standard?

Jan


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             reply	other threads:[~2010-10-30 16:00 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-30 15:58 Jan Kiszka [this message]
2010-10-30 17:06 ` Device assignment, shared IRQs, uio_pci_generic Alex Williamson
2010-10-31 15:05   ` Jan Kiszka
2010-11-01 11:27     ` Jan Kiszka

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