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[Qemu-devel] How to add a IRQ to QEMU

From: address@hidden
Subject: [Qemu-devel] How to add a IRQ to QEMU
Date: Mon, 29 Jul 2013 10:19:34 +0800

Hi, all
I want to add a pci device just like pci-serial to QEMU, there are some qeustion while add a IRQ.
In the init() function,
pci->dev.config[PCI_INTERRUPT_PIN] = 0x01;
s->irq = pci->dev.irq[0];
In the write() function
if (val & 0xff) == 0x99)
What i want to do is generate an interrupt when write to io port, and then the interrupt routine in Linux will response this IRQ. And write 0x99 , then the qemu_irq_low(s->irq); will be called. However, the interrupt routine is called all the time.
What's the problem? What's the correct routine to add an interrupt?


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