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hw/isa/piix3: Avoid Xen-specific variant of piix3_write_config()

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Subscribe to pci_bus_fire_intx_routing_notifier() instead which allows for
having a common piix3_write_config() for the PIIX3 device models.

While at it, move the subscription into machine code to facilitate resolving
TYPE_PIIX3_XEN_DEVICE.

In a possible future followup, pci_bus_fire_intx_routing_notifier() could
be adjusted in such a way that subscribing to it doesn't require
knowledge of the device firing it.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Tested-by: Chuck Zmudzinski <brchuckz@aol.com>
Message-Id: <20230312120221.99183-5-shentey@gmail.com>
Message-Id: <20230403074124.3925-6-shentey@gmail.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Bernhard Beschow 2023-04-03 09:41:22 +02:00 • committed by Anthony PERARD
parent 60a9eb57f3
commit 89965db43c
2 changed files with 19 additions and 21 deletions
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18
hw/i386/pc_piix.c
View file

@ -90,6 +90,21 @@ static int pc_pci_slot_get_pirq(PCIDevice *pci_dev, int pci_intx)
return (pci_intx + slot_addend) & 3;
}
static void piix_intx_routing_notifier_xen(PCIDevice *dev)
{
int i;
/* Scan for updates to PCI link routes (0x60-0x63). */
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;
xen_set_pci_link_route(i, v);
}
}
/* PC hardware initialisation */
static void pc_init1(MachineState *machine,
const char *host_type, const char *pci_type)
@ -241,6 +256,9 @@ static void pc_init1(MachineState *machine,
pci_dev = pci_create_simple_multifunction(pci_bus, -1, true, type);
if (xen_enabled()) {
pci_device_set_intx_routing_notifier(
pci_dev, piix_intx_routing_notifier_xen);
/*
* Xen supports additional interrupt routes from the PCI devices to
* the IOAPIC: the four pins of each PCI device on the bus are also