kvm: Introduce core services for in-kernel irqchip support
Add the basic infrastructure to active in-kernel irqchip support, inject
interrupts into these models, and maintain IRQ routes.
Routing is optional and depends on the host arch supporting
KVM_CAP_IRQ_ROUTING. When it's not available on x86, we looe the HPET as
we can't route GSI0 to IOAPIC pin 2.
In-kernel irqchip support will once be controlled by the machine
property 'kernel_irqchip', but this is not yet wired up.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 1f56492..f6f4189 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -1939,3 +1939,14 @@
return !(env->cr[0] & CR0_PE_MASK) ||
((env->segs[R_CS].selector & 3) != 3);
}
+
+void kvm_arch_init_irq_routing(KVMState *s)
+{
+ if (!kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
+ /* If kernel can't do irq routing, interrupt source
+ * override 0->2 cannot be set up as required by HPET.
+ * So we have to disable it.
+ */
+ no_hpet = 1;
+ }
+}
