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Date: Fri, 15 Jun 2012 11:04:15 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] question about irq update
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To: Zhi Hui Li <zhihuili@linux.vnet.ibm.com>
Cc: Kevin Wolf <kwolf@redhat.com>, QEMU-devel <qemu-devel@nongnu.org>

Il 15/06/2012 10:42, Zhi Hui Li ha scritto:
> 
> bool qtest_get_irq(QTestState *s, int num)
> {
>     /* dummy operation in order to make sure irq is up to date */
>     qtest_inb(s, 0);
> 
>     return s->irq_level[num];
> }
> 
> but I don't know how it can make the irq up to date
> and why we will read from the address of 0 ?

It just forces libqtest to read any pending events.

Paolo