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. Since auto-EOI behavior of SynIC cannot be made compatible with APIC hardware virtualization, the latter is disabled using a newly introduced flag, when SynIC is activated. This patches seria has been tested by running of kvm-unit-tests (which also includes previosly sent 'hyperv_synic' test) with host CPU which supports APICv (Intel(R) Xeon(R) CPU E5-2407 v2 @ 2.40GHz) Signed-off-by: Andrey Smetanin <asmetanin@xxxxxxxxxxxxx> Reviewed-by: Roman Kagan <rkagan@xxxxxxxxxxxxx> Signed-off-by: Denis V. Lunev <den@xxxxxxxxxx> CC: Gleb Natapov <gleb@xxxxxxxxxx> CC: Paolo Bonzini <pbonzini@xxxxxxxxxx> CC: Roman Kagan <rkagan@xxxxxxxxxxxxx> CC: Denis V. Lunev <den@xxxxxxxxxx> CC: qemu-devel@xxxxxxxxxx Changes v4: * disable APICv in case Hyper-V SynIC enabled * patchset rebase into latest kvm/queue (10 Nov 2015) * do Hyper-V SynIC exit only at !host(guest) msr's writes Changes v3: * Hyper-V SynIC KVM API documentation fixes Changes v2: * irqchip/eventfd preparation improvements to support arch specific routing entries like Hyper-V SynIC. * add Hyper-V SynIC vectors into EOI exit bitmap. * do not use posted interrupts in case of Hyper-V SynIC AutoEOI vectors Andrey Smetanin (5): kvm/irqchip: kvm_arch_irq_routing_update renaming split kvm/x86: split ioapic-handled and EOI exit bitmaps kvm/x86: per-vcpu apicv deactivation support kvm/x86: Hyper-V synthetic interrupt controller kvm/x86: Hyper-V kvm exit Documentation/virtual/kvm/api.txt | 41 +++++ arch/x86/include/asm/kvm_host.h | 26 ++- arch/x86/kvm/hyperv.c | 335 ++++++++++++++++++++++++++++++++++++++ arch/x86/kvm/hyperv.h | 23 +++ arch/x86/kvm/ioapic.c | 4 +- arch/x86/kvm/ioapic.h | 7 +- arch/x86/kvm/irq.c | 2 +- arch/x86/kvm/irq_comm.c | 41 ++++- arch/x86/kvm/lapic.c | 40 +++-- arch/x86/kvm/lapic.h | 9 +- arch/x86/kvm/svm.c | 13 +- arch/x86/kvm/vmx.c | 48 +++--- arch/x86/kvm/x86.c | 66 +++++++- include/linux/kvm_host.h | 12 +- include/uapi/linux/kvm.h | 25 +++ virt/kvm/irqchip.c | 7 +- 16 files changed, 625 insertions(+), 74 deletions(-) -- 2.4.3 -- 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
