Re: [PATCH v2 2/5] KVM: arm/arm64: Add ARM user space interrupt signaling ABI

Peter Maydell
2017-02-03T17:51:41Z

On 3 February 2017 at 14:56, Christoffer Dall <cdall@linaro.org> wrote:
> From: Christoffer Dall <christoffer.dall@linaro.org>
>
> We have 2 modes for dealing with interrupts in the ARM world. We can
> either handle them all using hardware acceleration through the vgic or
> we can emulate a gic in user space and only drive CPU IRQ pins from
> there.
>
> Unfortunately, when driving IRQs from user space, we never tell user
> space about events from devices emulated inside the kernel, which may
> result in interrupt line state changes, so we lose out on for example
> timer and PMU events if we run with user space gic emulation.
>
> Define an ABI to publish such device output levels to userspace.
>
> Signed-off-by: Alexander Graf <agraf@suse.de>
> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

Acked-by: Peter Maydell <peter.maydell@linaro.org>

for the userspace ABI/docs part.

thanks
-- PMM