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hw/i386/pc_piix: Make piix_intx_routing_notifier_xen() more device independent

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This is a follow-up on commit 89965db43c "hw/isa/piix3: Avoid Xen-specific
variant of piix3_write_config()" which introduced
piix_intx_routing_notifier_xen(). This function is implemented in board code 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 exercise
for now.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240107231623.5282-1-shentey@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Bernhard Beschow 2024-01-08 00:16:23 +01:00 committed by Philippe Mathieu-Daudé
parent c8cdec74e6
commit ebd92d6de3
1 changed files with 3 additions and 6 deletions
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9
hw/i386/pc_piix.c
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@ -92,13 +92,10 @@ static void piix_intx_routing_notifier_xen(PCIDevice *dev)
{
int i;
/* Scan for updates to PCI link routes (0x60-0x63). */
/* Scan for updates to PCI link routes. */
for (i = 0; i < PIIX_NUM_PIRQS; i++) {
uint8_t v = dev->config_read(dev, PIIX_PIRQCA + i, 1);
if (v & 0x80) {
v = 0;
}
v &= 0xf;
const PCIINTxRoute route = pci_device_route_intx_to_irq(dev, i);
const uint8_t v = route.mode == PCI_INTX_ENABLED ? route.irq : 0;
xen_set_pci_link_route(i, v);
}
}