fix PIT injection

Status from this message: Applied all, thanks.

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Versions newest first

#	Subject and files	Size	Replies
1/3	KVM: Add irq ack notifier list`arch/x86/kvm/irq.c` `arch/x86/kvm/irq.h` `include/asm-x86/kvm_host.h`	+34 -0	0 replies
2/3	KVM: irq ack notification`arch/x86/kvm/i8259.c` `arch/x86/kvm/irq.c` `arch/x86/kvm/irq.h` +3 more	+34 ~~-13~~	0 replies
3/3	KVM: PIT: fix injection logic and count`arch/x86/kvm/i8254.c` `arch/x86/kvm/i8254.h` `arch/x86/kvm/irq.c`	+38 ~~-40~~	5 replies

No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.

Cover letter [patch 0/3] fix PIT injection

The in-kernel PIT emulation can either inject too many or too few interrupts.