Re: [Qemu-devel] Re: [RFT][PATCH 07/15] qemu_irq: Add IRQ handlers with delivery feedback

[Avi Kivity]

On 05/28/2010 01:19 AM, Jan Kiszka wrote:
> Still, this does not answer:
>
> - How do you want to detect lost timer ticks?
>
>    

Your (and Gleb's) approach: during injection
An alternative: during guest ack

The normal pattern is inj/ack/inj/ack; if we see inj/inj/inj we know the 
guest isn't keeping up.

> - What subsystem(s) keeps track of the backlog?
>    

Clearly, the clock chip (hpet/rtc/pit).

With the alternative approach, the clock emulation requests that acks be 
reported via a qemu_irq interface.

> - And depending on the above: How to detect at all that a specific IRQ
>    is a timer tick?
>    

Clearly, a blocker unless the clock is responsible for timekeeping.

--
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