Re: Hard limit on 256 IRQs in qtest

[Thomas Huth]

On 21/07/2022 18.17, Roque Arcudia Hernandez wrote:
> Hello,
>
>
> To write a qtest for an SoC using ARM GICv3 as interrupt controller the 
> qtest infrastructure is short on IRQs.
>
> File tests/qtest/libqtest.c defines:
>
> #define MAX_IRQ 256
>
> Which is the number of elements in the array that is used to keep track of 
> the value of the irq gpio:
>
>      bool irq_level[MAX_IRQ];
>
> The GICv3 can take up to 1020. The SoC we are trying to emulate uses more 
> than the current 256 limit we can observe at the GIC input. If we focus just 
> on the external interrupt range the GIC would need 1020 - 32 = 988 IRQs. 
> Will it be OK to make this change to the qtest infrastructure?

I guess it should be fine. Just not that you have to adjust the same #define 
in softmmu/qtest.c, too.

 Thomas