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Tsirkin" , Marcel Apfelbaum , Paul Durrant , Richard Henderson , Anthony PERARD , Bernhard Beschow Subject: [PATCH] hw/i386/pc_piix: Make piix_intx_routing_notifier_xen() more device independent Date: Mon, 8 Jan 2024 00:16:23 +0100 Message-ID: <20240107231623.5282-1-shentey@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1704669418592100001 Content-Type: text/plain; charset="utf-8" This is a follow-up on commit 89965db43cce "hw/isa/piix3: Avoid Xen-specific variant of piix3_write_config()" which introduced piix_intx_routing_notifier_xen(). This function is implemented in board cod= e but accesses the PCI configuration space of the PIIX ISA function to determine = the PCI interrupt routes. Avoid this by reusing pci_device_route_intx_to_irq() = which makes piix_intx_routing_notifier_xen() more device-agnostic. One remaining improvement would be making piix_intx_routing_notifier_xen() agnostic towards the number of PCI interrupt routes and move it to xen-hvm. This might be useful for possible Q35 Xen efforts but remains a future exer= cise for now. Signed-off-by: Bernhard Beschow Reviewed-by: David Woodhouse Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/i386/pc_piix.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index 042c13cdbc..abfcfe4d2b 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -92,13 +92,10 @@ static void piix_intx_routing_notifier_xen(PCIDevice *d= ev) { int i; =20 - /* Scan for updates to PCI link routes (0x60-0x63). */ + /* Scan for updates to PCI link routes. */ for (i =3D 0; i < PIIX_NUM_PIRQS; i++) { - uint8_t v =3D dev->config_read(dev, PIIX_PIRQCA + i, 1); - if (v & 0x80) { - v =3D 0; - } - v &=3D 0xf; + const PCIINTxRoute route =3D pci_device_route_intx_to_irq(dev, i); + const uint8_t v =3D route.mode =3D=3D PCI_INTX_ENABLED ? route.irq= : 0; xen_set_pci_link_route(i, v); } } --=20 2.43.0