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Date: Tue, 3 Mar 2009 13:54:11 +0100
From: Christoph Hellwig <hch@lst.de>
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Subject: [Qemu-devel] virtio-blk issues
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To: qemu-devel@nongnu.org

I've been trying to move setup from kvm 72 in debian testing to the current
qemu CVS.  The setup is using 7 virtio_blk disks and used to work on the
old setup, but with current qemu the kernel (current Linus' HEAD from a few
days ago) hangs when trying to setup the irq routing for the virtio_pci
devices:

virtio pci 0000:00:06.0: can't derive routing for PCI INT A
virtio pci 0000:00:06.0: PCI INT A: no GSI - using IRQ 9

Below is the config file I'm using.  When commenting out the drive lines
so that only the first two are left the system boots, although rather
slowly compared to kvm (this is using the minimal kvm support in qemu
upstream, without it it's of course even slower).


#!/bin/sh

/opt/qemu/bin/qemu -m 1000 -enable-kvm -kernel $1 \
	-drive file=/dev/vg00/qemu-root,if=virtio,media=disk \
	-drive file=/dev/vg00/qemu-test,if=virtio,media=disk \
	-drive file=/dev/vg00/qemu-test-log,if=virtio,media=disk \
	-drive file=/dev/vg00/qemu-test-rt,if=virtio,media=disk \
	-drive file=/dev/vg00/qemu-scratch,if=virtio,media=disk \
	-drive file=/dev/vg00/qemu-scratch-log,if=virtio,media=disk \
	-drive file=/dev/vg00/qemu-scratch-rt,if=virtio,media=disk \
	-append "root=/dev/vda console=tty0 console=ttyS0,38400n8"