On Wed, Jan 24, 2024 at 20:37:41 +0100, Andrea Bolognani wrote:
> Mostly reduce the number of 'else if' and improve comments.
>
> Signed-off-by: Andrea Bolognani <[email protected]>
> ---
> src/qemu/qemu_domain.c | 62 ++++++++++++++++++++++++------------------
> 1 file changed, 36 insertions(+), 26 deletions(-)
>
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> index d992b51877..dcf73c0e08 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
[...]
> @@ -4200,50 +4198,62 @@ qemuDomainDefaultUSBControllerModel(const
> virDomainDef *def,
[...]
> - } else if (def->os.arch == VIR_ARCH_AARCH64) {
> +
> + /* For ppc64 specifically, returning -1 here will result in
VIR_DOMAIN_CONTROLLER_MODEL_USB_DEFAULT
> + * an attempt to use the legacy USB controller rather than an
> + * outright failure */
> + return -1;
VIR_DOMAIN_CONTROLLER_MODEL_USB_DEFAULT
> + }
> +
> + if (def->os.arch == VIR_ARCH_AARCH64) {
> + /* Prefer USB3 */
> if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_QEMU_XHCI))
> return VIR_DOMAIN_CONTROLLER_MODEL_USB_QEMU_XHCI;
> - else if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NEC_USB_XHCI))
> + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NEC_USB_XHCI))
> return VIR_DOMAIN_CONTROLLER_MODEL_USB_NEC_XHCI;
> +
> + /* We should probably return -1 here and avoid the
VIR_DOMAIN_CONTROLLER_MODEL_USB_DEFAULT/VIR_DOMAIN_CONTROLLER_MODEL_USB_NONE
> + * possibility of falling back to piix3-uhci (USB1), but
> + * historically we haven't done that and starting now might
> + * cause backwards compatibility issues */
> }
>
> if (ARCH_IS_X86(def->os.arch)) {
> if (qemuDomainIsQ35(def) && autoAdded) {
> - /* Prefer adding a USB3 controller if supported, fall back
> - * to USB2 if there is no USB3 available, and if that's
> - * unavailable don't add anything.
> - */
> + /* Prefer USB3 */
> if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_QEMU_XHCI))
> return VIR_DOMAIN_CONTROLLER_MODEL_USB_QEMU_XHCI;
> if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NEC_USB_XHCI))
> return VIR_DOMAIN_CONTROLLER_MODEL_USB_NEC_XHCI;
> +
> + /* Fall back to USB2 */
> if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_ICH9_USB_EHCI1))
> return VIR_DOMAIN_CONTROLLER_MODEL_USB_ICH9_EHCI1;
> +
> + /* If no suitable device is available, simply avoid
> + * adding the controller */
> return -2;
> }
> }
>
> - /* Default USB controller is piix3-uhci if available. */
> + /* piix3-uhci (USB1) is the last ditch effort before giving up */
> if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_PIIX3_USB_UHCI))
> return VIR_DOMAIN_CONTROLLER_MODEL_USB_PIIX3_UHCI;
>
> + /* No suitable model could be found. This will return in either
> + * an error or the use of the legacy USB controller */
The caller will report this as an error or use the legacy USB
controller.
> return -1;
> }
Reviewed-by: Peter Krempa <[email protected]>
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