[Bug 1919021] [NEW] Confuse error message in virtio_init_region_cache()

[Philippe Mathieu-Daudé]

Public bug reported:

The error message added in commit e45da653223 to virtio_init_region_cache()
are somehow confuse:

  qemu-system-i386: Cannot map used

It would be helpful to more explicit string, including "virtio" prefix.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1919021

Title:
  Confuse error message in virtio_init_region_cache()

Status in QEMU:
  New

Bug description:
  The error message added in commit e45da653223 to virtio_init_region_cache()
  are somehow confuse:

    qemu-system-i386: Cannot map used

  It would be helpful to more explicit string, including "virtio"
  prefix.

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