Hi, On 24/11/14 10:10, Eric Auger wrote: > 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. Yes, I can confirm this. I also manually checked the patches to spot any fallouts due to the vgic.c file split, but Eric's patches are not affected by this. Cheers, Andre. > > BR > > Eric >> >> Thanks, >> -Christoffer >> > > _______________________________________________ > kvmarm mailing list > kvmarm@xxxxxxxxxxxxxxxxxxxxx > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > -- 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
