On 11/24/2014 10:47 AM, Christoffer Dall wrote: > On Sun, Nov 23, 2014 at 06:56:57PM +0100, Eric Auger wrote: >> This patch series enables irqfd on arm and arm64. >> >> Irqfd framework enables to inject a virtual IRQ into a guest upon an >> eventfd trigger. User-side uses KVM_IRQFD VM ioctl to provide KVM with >> a kvm_irqfd struct that associates a VM, an eventfd, a virtual IRQ number >> (aka. the gsi). When an actor signals the eventfd (typically a VFIO >> platform driver), the kvm irqfd subsystem injects the gsi into the VM. >> >> Resamplefd also is supported for level sensitive interrupts, ie. the >> user can provide another eventfd that is triggered when the completion >> of the virtual IRQ (gsi) is detected by the GIC. >> >> The gsi must correspond to a shared peripheral interrupt (SPI), ie the >> GIC interrupt ID is gsi + 32. >> >> The rationale behind not supporting PPI irqfd injection is that >> any device using a PPI would be a private-to-the-CPU device (timer for >> instance), so its state would have to be context-switched along with the >> VCPU and would require in-kernel wiring anyhow. It is not a relevant use >> case for irqfds. >> >> this patch enables CONFIG_HAVE_KVM_EVENTFD and CONFIG_HAVE_KVM_IRQFD. >> >> No IRQ routing table is used, enabling to remove CONFIG_HAVE_KVM_IRQCHIP >> >> can be found at git://git.linaro.org/people/eric.auger/linux.git >> on branch irqfd_integ_v8 >> >> This work was tested with Calxeda Midway xgmac main interrupt with >> qemu-system-arm and QEMU VFIO platform device. Also irqfd was proven >> functional on several vhost-net prototypes. >> >> v3 -> v4: >> - rebase on 3.18rc5 >> - vgic dynamic instantiation brought new challenges: >> handling of irqfd injection when vgic is not ready >> - unset of CONFIG_HAVE_KVM_IRQCHIP in a separate patch >> - add arm64 enable >> - vgic.c style modifications according to Christoffer comments >> > > There also seems to be a different split of the patches here? Hi Christoffer, yes I added arm64b support and moved CONFIG_HAVE_KVM_IRQCHIP removal in a separate patch. > > We've probably also reached the point where you need to start rebasing > on Andre's GICv3 patches, which I expect will go in first. the patch applies without conflict on Andre's series. BR Eric > > Thanks, > -Christoffer > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
