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KVM: Allow PIT emulation without speaker port

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The in-kernel speaker emulation is only a dummy and also unneeded from
the performance point of view. Rather, it takes user space support to
generate sound output on the host, e.g. console beeps.

To allow this, introduce KVM_CREATE_PIT2 which controls in-kernel
speaker port emulation via a flag passed along the new IOCTL. It also
leaves room for future extensions of the PIT configuration interface.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka
2009-05-14 22:42:53 +02:00
committed by Avi Kivity
parent 721eecbf4f
commit c5ff41ce66
4 changed files with 32 additions and 8 deletions
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14
arch/x86/kvm/i8254.c
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@@ -563,7 +563,7 @@ static void pit_mask_notifer(struct kvm_irq_mask_notifier *kimn, bool mask)
}
}
struct kvm_pit *kvm_create_pit(struct kvm *kvm)
struct kvm_pit *kvm_create_pit(struct kvm *kvm, u32 flags)
{
struct kvm_pit *pit;
struct kvm_kpit_state *pit_state;
@@ -589,11 +589,13 @@ struct kvm_pit *kvm_create_pit(struct kvm *kvm)
pit->dev.private = pit;
kvm_io_bus_register_dev(&kvm->pio_bus, &pit->dev);
pit->speaker_dev.read = speaker_ioport_read;
pit->speaker_dev.write = speaker_ioport_write;
pit->speaker_dev.in_range = speaker_in_range;
pit->speaker_dev.private = pit;
kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
if (flags & KVM_PIT_SPEAKER_DUMMY) {
pit->speaker_dev.read = speaker_ioport_read;
pit->speaker_dev.write = speaker_ioport_write;
pit->speaker_dev.in_range = speaker_in_range;
pit->speaker_dev.private = pit;
kvm_io_bus_register_dev(&kvm->pio_bus, &pit->speaker_dev);
}
kvm->arch.vpit = pit;
pit->kvm = kvm;