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[Qemu-devel] [PATCH v4 0/5] KVM: Hyper-V synthetic interrupt controller


From: Andrey Smetanin
Subject: [Qemu-devel] [PATCH v4 0/5] KVM: Hyper-V synthetic interrupt controller
Date: Tue, 10 Nov 2015 15:36:30 +0300

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 <address@hidden>
Reviewed-by: Roman Kagan <address@hidden>
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Gleb Natapov <address@hidden>
CC: Paolo Bonzini <address@hidden>
CC: Roman Kagan <address@hidden>
CC: Denis V. Lunev <address@hidden>
CC: address@hidden

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




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