Hi, here's my current patchset enabling irqfds for s390, based on current kvm/queue. It introduces adapter interrupts for virtio-ccw (these have been specced for virtio-1.0 in the virtio oasis standard that is currently under work). We use two-staged indicators for the queue indicator area (summary indicator) and the queue indicators. Mainly fixes compared to the last time I posted this as an RFC (it has been some time...) For implementing irqfds, we exploit the common infrastructure via adding a new interrupt routing type for adapter interrupts. Each of these routes contains several parameters like the matching I/O adapter and the locations of the summary and queue indicators - one route per virtqueue. Patches 1 and 2 are relevant for guest support for adapter interrupts. Patch 1 will be pushed upstream via the s390 architecture tree. Patch 3 tries to fix a problem in the common irqfd code I managed to trigger; it might make sense to push this on its own. Patch 4 introduces infrastructure to enable capabilities on a per-vm basis (instead of only per-vcpu). It might be of common interest, but will be used in this patchset to introduce a s390-specific irqchip capability that needs to be enabled by userspace. Patch 5 introduces the concept of I/O adapters that act as adapter interrupt sources. They contain various characteristics, not all of them relevant for virtio-ccw but of general use for other types of adapter interrupts. They are registered and modified via the new s390 floating interrupt controller. Patch 6 finally wires up irqfds for virtio-ccw adapter interrupts. The capability for this needs to be explicitly enabled by userspace to avoid older qemus choking on newer kernels. Patch 7 is providing a stop-gap measure to let us run not-quite-as-small guests: we gobble up irqroutes fairly quickly. There must be a better way. A git branch with the patches is available at git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git kvms390-irqfd Cornelia Huck (6): KVM: s390: virtio-ccw adapter interrupt support. KVM: eventfd: Fix lock order inversion. KVM: Add per-vm capability enablement. KVM: s390: adapter interrupt sources KVM: s390: irq routing for adapter interrupts. KVM: Bump KVM_MAX_IRQ_ROUTES for s390 Martin Schwidefsky (1): s390/airq: add support for irq ranges Documentation/virtual/kvm/api.txt | 27 ++- Documentation/virtual/kvm/devices/s390_flic.txt | 45 ++++ arch/s390/include/asm/airq.h | 14 +- arch/s390/include/asm/irq.h | 1 + arch/s390/include/asm/kvm_host.h | 30 +++ arch/s390/include/uapi/asm/kvm.h | 22 ++ arch/s390/kernel/irq.c | 1 + arch/s390/kvm/Kconfig | 2 + arch/s390/kvm/Makefile | 2 +- arch/s390/kvm/interrupt.c | 287 ++++++++++++++++++++++- arch/s390/kvm/irq.h | 22 ++ arch/s390/kvm/kvm-s390.c | 42 ++++ arch/s390/kvm/kvm-s390.h | 2 + drivers/s390/cio/airq.c | 66 ++++-- drivers/s390/kvm/virtio_ccw.c | 276 +++++++++++++++++++++- include/linux/kvm_host.h | 13 + include/uapi/linux/kvm.h | 16 ++ virt/kvm/eventfd.c | 8 +- 18 files changed, 827 insertions(+), 49 deletions(-) create mode 100644 arch/s390/kvm/irq.h -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
