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kvm: Introduce core services for in-kernel irqchip support

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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>
This commit is contained in:
Jan Kiszka 2011-10-15 11:49:47 +02:00
parent 1660e72d4f
commit 84b058d7df
3 changed files with 168 additions and 0 deletions
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11
target-i386/kvm.c
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@ -1939,3 +1939,14 @@ bool kvm_arch_stop_on_emulation_error(CPUState *env)
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;
}
}