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These legacy ISA IRQs allow the PIIX IDE functions to be wired up in their south bridges and the VIA IDE functions to disuse PCI_INTERRUPT_LINE as outlined in https://lists.nongnu.org/archive/html/qemu-devel/2020-03/msg01707.html Suggested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: Bernhard Beschow <shentey@gmail.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20230126211740.66874-7-shentey@gmail.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>