[PATCH 00/14] KVM GICv3 emulation

[Andre Przywara]

GICv3 is the ARM generic interrupt controller designed to overcome
some limits of the prevalent GICv2. Most notably it lifts the 8-CPU
limit. Though with recent patches from Marc there is support for
hosts to use a GICv3, the CPU limitation still applies to KVM guests,
since the current code emulates a GICv2 only.
Also, GICv2 backward compatibility being optional in GICv3, a number
of systems won't be able to run GICv2 guests.

This patch series provides code to emulate a GICv3 distributor and
redistributor for any KVM guest. It requires a GICv3 in the host to
work. With those patches one can run guests efficiently on any GICv3
host. It has the following features:
- Affinity routing (support for up to 255 VCPUs, more possible)
- System registers (as opposed to MMIO access)
- No ITS
- No priority support (as the GICv2 emulation)
- No save / restore support so far (will be added soon)

The first 10 patches actually refactor the current VGIC code to make
room for a different VGIC model to be dropped in with Patch 11/14.
The remaining patches connect the new model to the kernel backend and
the userland facing code.

The series goes on top of both Marc's GICv3 host support series as
well as his vgic-dyn patches.
The necessary patches for kvmtool to enable the guest's GICv3 will be
posted here as well.
There was some testing on the fast model with some I/O and interrupt
affinity shuffling in a Linux guest with a varying number of VCPUs.

Please review and test.
I would be grateful for people to test for GICv2 regressions also
(so on a GICv2 host with current kvmtool/qemu), as there is quite
some refactoring on that front.

Much of the code was inspired by Marc, so send all praises to him
(while I take the blame).

Cheers,
Andre.

Andre Przywara (14):
  arm/arm64: KVM: rework MPIDR assignment and add accessors
  arm/arm64: KVM: pass down user space provided GIC type into vGIC code
  arm/arm64: KVM: refactor vgic_handle_mmio() function
  arm/arm64: KVM: wrap 64 bit MMIO accesses with two 32 bit ones
  arm/arm64: KVM: introduce per-VM ops
  arm/arm64: KVM: make the maximum number of vCPUs a per-VM value
  arm/arm64: KVM: make the value of ICC_SRE_EL1 a per-VM variable
  arm/arm64: KVM: refactor MMIO accessors
  arm/arm64: KVM: split GICv2 specific emulation code from vgic.c
  arm/arm64: KVM: add opaque private pointer to MMIO accessors
  arm/arm64: KVM: add virtual GICv3 distributor emulation
  arm/arm64: KVM: add SGI system register trapping
  arm/arm64: KVM: enable kernel side of GICv3 emulation
  arm/arm64: KVM: allow userland to request a virtual GICv3

 arch/arm/include/asm/kvm_emulate.h   |    2 +-
 arch/arm/include/asm/kvm_host.h      |    3 +
 arch/arm/kvm/Makefile                |    1 +
 arch/arm/kvm/arm.c                   |   23 +-
 arch/arm/kvm/coproc.c                |   19 +
 arch/arm/kvm/psci.c                  |   15 +-
 arch/arm64/include/asm/kvm_emulate.h |    3 +-
 arch/arm64/include/asm/kvm_host.h    |    5 +
 arch/arm64/include/uapi/asm/kvm.h    |    7 +
 arch/arm64/kernel/asm-offsets.c      |    1 +
 arch/arm64/kvm/Makefile              |    2 +
 arch/arm64/kvm/sys_regs.c            |   37 +-
 arch/arm64/kvm/vgic-v3-switch.S      |   14 +-
 include/kvm/arm_vgic.h               |   38 +-
 include/linux/irqchip/arm-gic-v3.h   |   26 +
 include/linux/kvm_host.h             |    1 +
 include/uapi/linux/kvm.h             |    1 +
 virt/kvm/arm/vgic-v2-emul.c          |  802 +++++++++++++++++++++++++++
 virt/kvm/arm/vgic-v2.c               |   22 +-
 virt/kvm/arm/vgic-v3-emul.c          |  898 ++++++++++++++++++++++++++++++
 virt/kvm/arm/vgic-v3.c               |  157 +++++-
 virt/kvm/arm/vgic.c                  | 1017 +++++++---------------------------
 virt/kvm/arm/vgic.h                  |  117 ++++
 virt/kvm/kvm_main.c                  |    3 +
 24 files changed, 2346 insertions(+), 868 deletions(-)
 create mode 100644 virt/kvm/arm/vgic-v2-emul.c
 create mode 100644 virt/kvm/arm/vgic-v3-emul.c
 create mode 100644 virt/kvm/arm/vgic.h

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1.7.9.5