This patchset implements the KVM part of the synthetic interrupt controller (SynIC) which is a building block of the Hyper-V paravirtualized device bus (vmbus).
SynIC is a lapic extension, which is controlled via MSRs and maintains for each vCPU - 16 synthetic interrupt "lines" (SINT's); each can be configured to trigger a specific interrupt vector optionally with auto-EOI semantics - a message page in the guest memory with 16 256-byte per-SINT message slots - an event flag page in the guest memory with 16 2048-bit per-SINT event flag areas The host triggers a SINT whenever it delivers a new message to the corresponding slot or flips an event flag bit in the corresponding area. The guest informs the host that it can try delivering a message by explicitly asserting EOI in lapic or writing to End-Of-Message (EOM) MSR. The userspace (qemu) triggers interrupts and receives EOM notifications via irqfd with resampler; for that, a GSI is allocated for each configured SINT, and irq_routing api is extended to support GSI-SINT mapping. Besides, a new vcpu exit is introduced to notify the userspace of the changes in SynIC configuraion triggered by guest writing to the corresponding MSRs. Signed-off-by: Andrey Smetanin <asmeta...@virtuozzo.com> Reviewed-by: Roman Kagan <rka...@virtuozzo.com> Signed-off-by: Denis V. Lunev <d...@openvz.org> CC: Vitaly Kuznetsov <vkuzn...@redhat.com> CC: "K. Y. Srinivasan" <k...@microsoft.com> CC: Gleb Natapov <g...@kernel.org> CC: Paolo Bonzini <pbonz...@redhat.com> Changes v2: * irqchip/eventfd preparation improvements to support arch specific routing entries like Hyper-V SynIC ones. * add Hyper-V SynIC vectors into EOI exit bitmap. * do not use posted interrupts in case of Hyper-V SynIC AutoEOI vectors _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization