[PATCH v2 00/36] irqchip/gic-v4: GICv4.1 architecture support

From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Jason Cooper <jason@lakedaemon.net>,
	Robert Richter <rrichter@marvell.com>,
	Jayachandran C <jnair@marvell.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH v2 00/36] irqchip/gic-v4: GICv4.1 architecture support
Date: Sun, 27 Oct 2019 14:41:58 +0000	[thread overview]
Message-ID: <20191027144234.8395-1-maz@kernel.org> (raw)

This rather long series expands the existing GICv4 support to deal with the
new GICv4.1 architecture, which comes with a set of major improvements
compared to v4.0:

- One architectural doorbell per vcpu, instead of one doorbell per VLPI

- Doorbell entirely managed by the HW, with an "at most once" delivery
  guarantee per non-residency phase and only when requested by the
  hypervisor

- A shared memory scheme between ITSs and redistributors, allowing for an
  optimised residency sequence (the use of VMOVP becomes less frequent)

- Support for direct virtual SGI delivery (the injection path still involves
  the hypervisor), at the cost of losing the active state on SGIs. It
  shouldn't be a big deal, but some guest operating systems might notice
  (Linux definitely won't care)

On the other hand, public documentation is not available yet, so that's a
bit annoying...

The series is roughly organised in 5 parts:

(1) A bunch of reworks to make the checking of some features more
    straightforward,
(2) VPE table allocation, new flavours of VMAPP/VMOVP commands
(3) v4.1 doorbell management
(4) Virtual SGI support
(5) Plumbing of virtual SGIs in KVM

Notes:

  - This series has uncovered a behaviour that looks like a HW bug on
    the Cavium ThunderX (aka TX1) platform (see patch #10). I'd very
    much welcome some clarification from the Marvell/Cavium folks on
    Cc, as well as an official erratum number if this happens to be an
    actual bug

  - I plan to take the first seven patches into 5.5 in order to reduce
    the size of the backlog:

    * patch #1 and #3 are good performance optimisations
    * patches #4 through to #7 are nice cleanups

    Do shout if you see any issue with this.

* From v1:
  - A bunch of minor reworks after Zenghui Yu's review
  - A workaround for what looks like a new and unexpected TX1 bug
  - A subtle reorder of the series so that some patches can go in early

Marc Zyngier (36):
  KVM: arm64: vgic-v4: Move the GICv4 residency flow to be driven by
    vcpu_load/put
  irqchip/gic-v3-its: Factor out wait_for_syncr primitive
  irqchip/gic-v3-its: Allow LPI invalidation via the DirectLPI interface
  irqchip/gic-v3-its: Make is_v4 use a TYPER copy
  irqchip/gic-v3-its: Kill its->ite_size and use TYPER copy instead
  irqchip/gic-v3-its: Kill its->device_ids and use TYPER copy instead
  irqchip/gic-v3-its: Add get_vlpi_map() helper
  irqchip/gic-v3: Detect GICv4.1 supporting RVPEID
  irqchip/gic-v3: Add GICv4.1 VPEID size discovery
  irqchip/gic-v3: Workaround Cavium TX1 erratum when reading GICD_TYPER2
  irqchip/gic-v4.1: VPE table (aka GICR_VPROPBASER) allocation
  irqchip/gic-v4.1: Implement the v4.1 flavour of VMAPP
  irqchip/gic-v4.1: Don't use the VPE proxy if RVPEID is set
  irqchip/gic-v4.1: Implement the v4.1 flavour of VMOVP
  irqchip/gic-v4.1: Plumb skeletal VPE irqchip
  irqchip/gic-v4.1: Add mask/unmask doorbell callbacks
  irqchip/gic-v4.1: Add VPE residency callback
  irqchip/gic-v4.1: Add VPE eviction callback
  irqchip/gic-v4.1: Add VPE INVALL callback
  irqchip/gic-v4.1: Suppress per-VLPI doorbell
  irqchip/gic-v4.1: Allow direct invalidation of VLPIs
  irqchip/gic-v4.1: Advertise support v4.1 to KVM
  irqchip/gic-v4.1: Map the ITS SGIR register page
  irqchip/gic-v4.1: Plumb skeletal VSGI irqchip
  irqchip/gic-v4.1: Add initial SGI configuration
  irqchip/gic-v4.1: Plumb mask/unmask SGI callbacks
  irqchip/gic-v4.1: Plumb get/set_irqchip_state SGI callbacks
  irqchip/gic-v4.1: Plumb set_vcpu_affinity SGI callbacks
  irqchip/gic-v4.1: Move doorbell management to the GICv4 abstraction
    layer
  irqchip/gic-v4.1: Add VSGI allocation/teardown
  irqchip/gic-v4.1: Add VSGI property setup
  irqchip/gic-v4.1: Eagerly vmap vPEs
  KVM: arm64: GICv4.1: Let doorbells be auto-enabled
  KVM: arm64: GICv4.1: Add direct injection capability to SGI registers
  KVM: arm64: GICv4.1: Configure SGIs as HW interrupts
  KVM: arm64: GICv4.1: Expose HW-based SGIs in debugfs

 arch/arm/include/asm/arch_gicv3.h      |    2 +
 arch/arm64/include/asm/arch_gicv3.h    |    1 +
 drivers/irqchip/irq-gic-v3-its.c       | 1102 +++++++++++++++++++++---
 drivers/irqchip/irq-gic-v3.c           |   46 +-
 drivers/irqchip/irq-gic-v4.c           |  143 ++-
 include/kvm/arm_vgic.h                 |    5 +-
 include/linux/irqchip/arm-gic-common.h |    2 +
 include/linux/irqchip/arm-gic-v3.h     |   75 +-
 include/linux/irqchip/arm-gic-v4.h     |   45 +-
 virt/kvm/arm/arm.c                     |   12 +-
 virt/kvm/arm/vgic/vgic-debug.c         |   14 +-
 virt/kvm/arm/vgic/vgic-mmio-v3.c       |   15 +-
 virt/kvm/arm/vgic/vgic-mmio.c          |   88 +-
 virt/kvm/arm/vgic/vgic-v3.c            |    5 +
 virt/kvm/arm/vgic/vgic-v4.c            |  106 ++-
 virt/kvm/arm/vgic/vgic.c               |    4 -
 virt/kvm/arm/vgic/vgic.h               |    2 -
 17 files changed, 1492 insertions(+), 175 deletions(-)

-- 
2.20.1

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