virtio block drivers not working

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I've been very unsuccessful in using the virtio block drivers inside of a guest. I can't seem to make them active. I'm positive my kernel has support for them turned on (not as a module, but as a direct built in), but when I change one of my ide drives over to virtio and boot, it isn't found, and nothing under /sys or /dev indicates the presence of a device. dmesg doesn't indicate anything about them either. I DO have virtio networking enabled and working, so I know as a whole that some of the virtio subsystem is functional.

The only thing I think I'm doing possibly differently than normal is using the "-kernel" option to boot up from a kernel image vs. having an installed boot image via lilo or grub. Would this make any difference?

Is there any way for me to debug some more as to why the block drivers don't seem to be showing up?

Thanks,
Caleb
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