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    Subject[PATCH 10/50] KVM: PIT: support mode 3
    Date
    From: Aurelien Jarno <aurelien@aurel32.net>

    The in-kernel PIT emulation ignores pending timers if operating
    under mode 3, which for example Hurd uses.

    This mode should output a square wave, high for (N+1)/2 counts and low
    for (N-1)/2 counts. As we only care about the resulting interrupts, the
    period is N, and mode 3 is the same as mode 2 with regard to
    interrupts.

    Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
    Signed-off-by: Avi Kivity <avi@qumranet.com>
    ---
    arch/x86/kvm/i8254.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
    index 735ec9a..60074dc 100644
    --- a/arch/x86/kvm/i8254.c
    +++ b/arch/x86/kvm/i8254.c
    @@ -308,6 +308,7 @@ static void pit_load_count(struct kvm *kvm, int channel, u32 val)
    create_pit_timer(&ps->pit_timer, val, 0);
    break;
    case 2:
    + case 3:
    create_pit_timer(&ps->pit_timer, val, 1);
    break;
    default:
    --
    1.5.6


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