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kvm: x86: Add user space part for in-kernel i8259

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Introduce the alternative 'kvm-i8259' device model that exploits KVM
in-kernel acceleration.

The PIIX3 initialization code is furthermore extended by KVM specific
IRQ route setup. GSI injection differs in KVM mode from the user space
model. As we can dispatch ISA-range IRQs to both IOAPIC and PIC inside
the kernel, we do not need to inject them separately. This is reflected
by a KVM-specific GSI handler.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
This commit is contained in:
Jan Kiszka 2011-10-16 15:30:27 +02:00
parent 680c1c6fd7
commit 10b6188275
4 changed files with 178 additions and 5 deletions
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52
hw/pc_piix.c
View file

@ -53,6 +53,42 @@ static const int ide_iobase[MAX_IDE_BUS] = { 0x1f0, 0x170 };
static const int ide_iobase2[MAX_IDE_BUS] = { 0x3f6, 0x376 };
static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
static void kvm_piix3_setup_irq_routing(bool pci_enabled)
{
#ifdef CONFIG_KVM
KVMState *s = kvm_state;
int ret, i;
if (kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
for (i = 0; i < 8; ++i) {
if (i == 2) {
continue;
}
kvm_irqchip_add_route(s, i, KVM_IRQCHIP_PIC_MASTER, i);
}
for (i = 8; i < 16; ++i) {
kvm_irqchip_add_route(s, i, KVM_IRQCHIP_PIC_SLAVE, i - 8);
}
ret = kvm_irqchip_commit_routes(s);
if (ret < 0) {
hw_error("KVM IRQ routing setup failed");
}
}
#endif /* CONFIG_KVM */
}
static void kvm_piix3_gsi_handler(void *opaque, int n, int level)
{
GSIState *s = opaque;
if (n < ISA_NUM_IRQS) {
/* Kernel will forward to both PIC and IOAPIC */
qemu_set_irq(s->i8259_irq[n], level);
} else {
qemu_set_irq(s->ioapic_irq[n], level);
}
}
static void ioapic_init(GSIState *gsi_state)
{
DeviceState *dev;
@ -134,7 +170,13 @@ static void pc_init1(MemoryRegion *system_memory,
}
gsi_state = g_malloc0(sizeof(*gsi_state));
gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS);
if (kvm_enabled() && kvm_irqchip_in_kernel()) {
kvm_piix3_setup_irq_routing(pci_enabled);
gsi = qemu_allocate_irqs(kvm_piix3_gsi_handler, gsi_state,
GSI_NUM_PINS);
} else {
gsi = qemu_allocate_irqs(gsi_handler, gsi_state, GSI_NUM_PINS);
}
if (pci_enabled) {
pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
@ -154,11 +196,13 @@ static void pc_init1(MemoryRegion *system_memory,
}
isa_bus_irqs(isa_bus, gsi);
if (!xen_enabled()) {
if (kvm_enabled() && kvm_irqchip_in_kernel()) {
i8259 = kvm_i8259_init(isa_bus);
} else if (xen_enabled()) {
i8259 = xen_interrupt_controller_init();
} else {
cpu_irq = pc_allocate_cpu_irq();
i8259 = i8259_init(isa_bus, cpu_irq[0]);
} else {
i8259 = xen_interrupt_controller_init();
}
for (i = 0; i < ISA_NUM_IRQS; i++) {