[Qemu-devel] [Bug 1722857] [NEW] Missing PCI "programming interface" ID emulation for USB host controllers

[Googulator]

Public bug reported:

Qemu doesn't currently emulate the correct value of the "register level
programming interface" field in the PCI config space of USB host
controllers. As a result, some guest operating systems (most notably
Windows) fail to load e.g. generic xHCI drivers, and instead ask for a
vendor-specific driver, which may not be always available.

Example: "-device nec-usb-xhci" emulates a Renesas (formerly NEC)
uPD720202 xHCI controller. However, in the PCI config space, it shows us
as class 0C, subclass 03, prog-if 00 (UHCI) where as the real uPD720202
(and all real xHCI controllers) have prog-if 30 (xHCI). A Windows guest
booted with this option will not recognize devices attached to the XHCI
controller unless drivers from Renesas are manually installed first,
even though recent Windows versions include a generic xHCI driver that
works perfectly well with real uPD720202 hardware.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1722857

Title:
  Missing PCI "programming interface" ID emulation for USB host
  controllers

Status in QEMU:
  New

Bug description:
  Qemu doesn't currently emulate the correct value of the "register
  level programming interface" field in the PCI config space of USB host
  controllers. As a result, some guest operating systems (most notably
  Windows) fail to load e.g. generic xHCI drivers, and instead ask for a
  vendor-specific driver, which may not be always available.

  Example: "-device nec-usb-xhci" emulates a Renesas (formerly NEC)
  uPD720202 xHCI controller. However, in the PCI config space, it shows
  us as class 0C, subclass 03, prog-if 00 (UHCI) where as the real
  uPD720202 (and all real xHCI controllers) have prog-if 30 (xHCI). A
  Windows guest booted with this option will not recognize devices
  attached to the XHCI controller unless drivers from Renesas are
  manually installed first, even though recent Windows versions include
  a generic xHCI driver that works perfectly well with real uPD720202
  hardware.

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