From 506fa577db1df370eb4894f34a6d9ee28aa1d679 Mon Sep 17 00:00:00 2001 From: Thomas Huth Date: Mon, 9 Mar 2026 19:14:52 +0100 Subject: [PATCH] hw/sparc64/sun4u: Mark unusable PCI busses as full to ease device plugging MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When trying to plug a PCI device to a Sparc64 machine, you currently have to specify the right bus ("bus=pciB"), otherwise you get this error: $ qemu-system-sparc64 -device virtio-scsi-pci qemu-system-sparc64: -device virtio-scsi-pci: PCI: no slot/function available for virtio-scsi-pci, all in use or reserved This is quite annoying for the unexperienced users, and it also breaks e.g. the iotests ("make check-block") when running with qemu-system-sparc64. Mark the non-usable PCI busses as full now, so that QEMU can automatically plug new PCI devices to the right "pciB" bus. Signed-off-by: Thomas Huth Message-ID: <20260309181452.83702-1-thuth@redhat.com> Signed-off-by: Philippe Mathieu-Daudé --- hw/sparc64/sun4u.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c index d69ed9a81a..a348096aee 100644 --- a/hw/sparc64/sun4u.c +++ b/hw/sparc64/sun4u.c @@ -719,6 +719,13 @@ static void sun4uv_init(MemoryRegion *address_space_mem, fw_cfg_add_i16(fw_cfg, FW_CFG_SPARC64_DEPTH, graphic_depth); qemu_register_boot_set(fw_cfg_boot_set, fw_cfg); + + /* + * Mark internal PCI busses as full so that the plugging of additional + * PCI devices happens on the right bus that still has free slots: + */ + qbus_mark_full(&pci_bus->qbus); + qbus_mark_full(&pci_busA->qbus); } enum {