From mboxrd@z Thu Jan 1 00:00:00 1970 From: cdall@linaro.org (Christoffer Dall) Date: Tue, 21 Feb 2017 12:41:53 +0100 Subject: [PATCH v2 2/5] KVM: arm/arm64: Add ARM user space interrupt signaling ABI In-Reply-To: References: <20170203145655.15007-1-cdall@linaro.org> <20170203145655.15007-3-cdall@linaro.org> Message-ID: <20170221114153.GA26976@cbox> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Alex, On Fri, Feb 03, 2017 at 05:51:18PM +0000, Peter Maydell wrote: > On 3 February 2017 at 14:56, Christoffer Dall wrote: > > From: Christoffer Dall > > > > 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 > > Signed-off-by: Christoffer Dall > > > Acked-by: Peter Maydell > > for the userspace ABI/docs part. > Given Peter's ack on this ABI, any chance you could take a look at fixing the userspace SMP issue and respinning the userspace patches for this series? Thanks, -Christoffer