virtio indirect with lots of descriptors

[Dave Airlie]

Hi Rusty,

playing with my virtio gpu, I started hitting the qemu
error_report("Too many read descriptors in indirect table");

Now I'm not sure but this doesn't seem to be a virtio limit that the
guest catches from what I can see, since my host dies quite quickly,
when I'm doing transfers in/out of a 5MB object with an sg entry per
page.

Just wondering if you can confirm if this is only a qemu limitation or
if I should just work around it at a bit of a higher level in my
driver/device?

Dave.
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