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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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