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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1771256947; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=+USCgHFiPNvrOaxKAyrXKL9M8GKKvwHi8L2w83I4I2M=; b=FyN1zGD4Cz0uZp1SnmYbPCLw2WqeDGUoMD+aJh19batPWyBR8qpsmTItcKsF42o8WrApaY XpbgQnX8KROZlZePakObQfJ7XScccCnmbMNkGQgh2ebvcaAS3DoWr7/1EB/9DK1kr/wtAo dPgIIj9uKbrAQVC3qzFhRVto82WDK9k= X-MC-Unique: MSWwJHU_MFipdxW0LjjtWQ-1 X-Mimecast-MFC-AGG-ID: MSWwJHU_MFipdxW0LjjtWQ_1771256944 From: Thomas Huth To: qemu-devel@nongnu.org, Mark Cave-Ayland Subject: [PATCH] hw/pci-host/sabre: Mark unusable PCI busses as full to ease device plugging Date: Mon, 16 Feb 2026 16:49:01 +0100 Message-ID: <20260216154901.602613-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Thomas Huth When trying to plug a PCI device to a Sparc64 machine, you currently have to specify the right bus ("bus=3DpciB"), 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 --- Note: Only lightly tested, it seems to work fine for me at a first glance, but maybe I missed something... hw/pci-host/sabre.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/hw/pci-host/sabre.c b/hw/pci-host/sabre.c index cd2328ad53f..9c8519f3849 100644 --- a/hw/pci-host/sabre.c +++ b/hw/pci-host/sabre.c @@ -382,6 +382,7 @@ static void sabre_realize(DeviceState *dev, Error **err= p) &s->pci_mmio, &s->pci_ioport, 0, 0x40, TYPE_PCI_BUS); + qbus_mark_full(&phb->bus->qbus); =20 pci_create_simple(phb->bus, 0, TYPE_SABRE_PCI_DEVICE); =20 @@ -400,6 +401,7 @@ static void sabre_realize(DeviceState *dev, Error **err= p) s->bridgeA =3D PCI_BRIDGE(pci_dev); pci_bridge_map_irq(s->bridgeA, "pciA", pci_simbaA_map_irq); pci_realize_and_unref(pci_dev, phb->bus, &error_fatal); + qbus_mark_full(&s->bridgeA->sec_bus.qbus); } =20 static void sabre_init(Object *obj) --=20 2.53.0