QEMU

  1. Bug #1594239
  2. Comment #22

Comment 22 for bug 1594239

Revision history for this message
Tom Hanson (thomas-hanson) wrote :

I haven't dug into the code for this particular aspect (yet) but it sounds like when a scsi-hd device is specified with a virtio backend but with no virtio bus specified, it is defaulting to an MMIO bus. Is this correct?

A few questions:

1) Is it valid for a SCSI drive to default to an MMIO bus/backend? Or should it have defaulted to PCI?

2) Given that the 2 scsi-hd devices were specified with no bus, no ID, and no LUN was there anything incorrect in how QEMU handled them? (Other than a more verbose error message being desirable.)

3) In the general case of a MMIO device, do they need to have a unique dev path? In the real world, there's no bus, no bus address, nothing that looks like a dev path. Just a memory address.

4) Or is it the case that MMIO devices need to be unique based solely on the device characteristics?