Qemu interrupt handling

Qemu interrupt handling

[saggin-O91pjutqpDaRIi+8W+d3eg]

Hi,
I would like to ask a question about how Qemu handle interrupt in user space.
I would like to understand how Qemu catch hardware interrupt generated by
real (host) peripheral.
I look at the Qemu code, (vl.c : main_loop and main_loop_wait) and I can't
identify where Qemu listens and catches the interrupts, for example, from
host NIC in order to pass to the guest NIC emulated.

Could you help me?

Thanks in advance.

Regards.
Saul Saggin


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Re: Qemu interrupt handling

[Avi Kivity]

saggin-O91pjutqpDaRIi+8W+d3eg@public.gmane.org wrote:
> Hi,
> I would like to ask a question about how Qemu handle interrupt in user space.
> I would like to understand how Qemu catch hardware interrupt generated by
> real (host) peripheral.
> I look at the Qemu code, (vl.c : main_loop and main_loop_wait) and I can't
> identify where Qemu listens and catches the interrupts, for example, from
> host NIC in order to pass to the guest NIC emulated.
>
> Could you help me?
>
>   

This is really more suitable for qemu-devel.

In general, qemu doesn't trap the real hardware interrupt; it waits for
a signal (or select()) indicating that there are packets waiting to be
received.  Depending on how the emulated nic is configured, there may or
may not be a virtual interrupt generated.


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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