On 14.02.2014, at 23:06, Gabriel L. Somlo <gsomlo@xxxxxxxxx> wrote:
> On Fri, Feb 14, 2014 at 10:21:09PM +0100, Alexander Graf wrote:
>>
>> Can't you just turn the polarity around in the pci host adapter?
>
> I tried this:
>
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 1221f32..0e86d21 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -118,13 +118,13 @@ static int pci_bar(PCIDevice *d, int reg)
>
> static inline int pci_irq_state(PCIDevice *d, int irq_num)
> {
> - return (d->irq_state >> irq_num) & 0x1;
> + return !(d->irq_state >> irq_num) & 0x1;
> }
>
> static inline void pci_set_irq_state(PCIDevice *d, int irq_num, int level)
> {
> d->irq_state &= ~(0x1 << irq_num);
> - d->irq_state |= level << irq_num;
> + d->irq_state &= ~(level << irq_num);
> }
>
> static void pci_change_irq_level(PCIDevice *pci_dev, int irq_num, int change)
> @@ -229,7 +229,7 @@ static void pcibus_reset(BusState *qbus)
> }
>
> for (i = 0; i < bus->nirq; i++) {
> - assert(bus->irq_count[i] == 0);
> + assert(bus->irq_count[i] != 0);
> }
> }
>
> ---
>
> but now OS X freezes during boot right after
>
> [ PCI configuration begin ]
> [ PCI configuration end, bridges 1, devices 10 ]
> RTC: Only single RAM bank (128 bytes)
>
> which all looks normal, except the process is supposed to continue on
> from there and doesn't :)
>
> On Linux, I get Fedora 20 live all the way up with no obvious/loud
> complaints, but mouse and keyboard don't work at all...
>
> I have to admit I'm a bit out of my depth here, though :)
Yeah, another thing we have to take into account is vhost-net which generates IRQs directly through irqfd. I guess for those we'll have to configure the polarity in the irq routing table?
Alex
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