diff options
Diffstat (limited to 'hw/i386/pc_piix.c')
| -rw-r--r-- | hw/i386/pc_piix.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index d5b0dcd..11af191 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -71,6 +71,7 @@ #include "kvm/kvm-cpu.h" #define MAX_IDE_BUS 2 +#define XEN_IOAPIC_NUM_PIRQS 128ULL #ifdef CONFIG_IDE_ISA static const int ide_iobase[MAX_IDE_BUS] = { 0x1f0, 0x170 }; @@ -238,6 +239,18 @@ static void pc_init1(MachineState *machine, pcms->bus = pci_bus; pci_dev = pci_create_simple_multifunction(pci_bus, -1, true, type); + + if (xen_enabled()) { + /* + * Xen supports additional interrupt routes from the PCI devices to + * the IOAPIC: the four pins of each PCI device on the bus are also + * connected to the IOAPIC directly. + * These additional routes can be discovered through ACPI. + */ + pci_bus_irqs(pci_bus, xen_intx_set_irq, pci_dev, + XEN_IOAPIC_NUM_PIRQS); + } + piix3 = PIIX3_PCI_DEVICE(pci_dev); piix3->pic = x86ms->gsi; piix3_devfn = piix3->dev.devfn; |