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Re: [Xen-devel] [PATCH 1/4] xen/arm: gic: Ensure we have an ISB between ack and do_IRQ()

On 03.12.18 14:17, Julien Grall wrote:
No. I meant that I would be happy with that and I think should also suit you.

There are no isb() in do_trap_irq(). So did you mean gic_interrupt()?
Right you are.

But then, I am not sure why you want to avoid the isb() in the guest path.
Well, as I remember, and the commit message says, it is needed to get peripheral register to be updated before interrupt handler reads them for interrupt handling :) About guest irqs, we, actually, do not handle them, just rise a notification to guest that it needs handling. Thus that synchronization is not required in a guest interrupt processing path.

Andrii Anisov.

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