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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>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH v3 00/32] irqchip/gic-v4: GICv4.1 architecture support
Date: Tue, 24 Dec 2019 11:10:23 +0000
Message-ID: <20191224111055.11836-1-maz@kernel.org> (raw)

[All I want for Christmas is... another monster GIC series!]

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) Feature detection, errata workaround for TX1
(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

Ideally, I'd like to start merging some of this into 5.6.

Notes:

  - This series has uncovered a behaviour that looks like a HW bug on
    the Cavium ThunderX (aka TX1) platform (see patch #3). 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.

    [v3 update]
    People have ignored for two months now, and it is fairly obvious
    that support for this machine is slowly bit-rotting. Maybe I'll
    drop the patch and instead start the process of removing all TX1
    support from the kernel (we'd certainly be better off without it).

* From v2 [2]:
  - Another bunch of fixes thanks to Zenghui Yu's very careful review
  - HW-accelerated SGIs are now optional thanks to new architected
    discovery/selection bits exposed by KVM and used by the guest kernel
  - Rebased on v5.5-rc2

* From v1 [1]:
  - 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

[1] https://lore.kernel.org/lkml/20190923182606.32100-1-maz@kernel.org/
[2] https://lore.kernel.org/lkml/20191027144234.8395-1-maz@kernel.org/

Marc Zyngier (32):
  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-v3: Use SGIs without active state if offered
  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: Allow SGIs to switch between HW and SW interrupts
  KVM: arm64: GICv4.1: Plumb SGI implementation selection in the
    distributor
  KVM: arm64: GICv4.1: Reload VLPI configuration on distributor
    enable/disable
  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 +
 arch/arm64/include/asm/kvm_host.h      |   1 +
 drivers/irqchip/irq-gic-v3-its.c       | 996 +++++++++++++++++++++++--
 drivers/irqchip/irq-gic-v3.c           |  57 +-
 drivers/irqchip/irq-gic-v4.c           | 134 +++-
 include/kvm/arm_vgic.h                 |   4 +
 include/linux/irqchip/arm-gic-common.h |   2 +
 include/linux/irqchip/arm-gic-v3.h     |  76 +-
 include/linux/irqchip/arm-gic-v4.h     |  43 +-
 virt/kvm/arm/arm.c                     |   8 +
 virt/kvm/arm/vgic/vgic-debug.c         |  14 +-
 virt/kvm/arm/vgic/vgic-mmio-v3.c       |  68 +-
 virt/kvm/arm/vgic/vgic-mmio.c          |  88 ++-
 virt/kvm/arm/vgic/vgic-v3.c            |   3 +
 virt/kvm/arm/vgic/vgic-v4.c            | 139 +++-
 virt/kvm/arm/vgic/vgic.h               |   1 +
 17 files changed, 1522 insertions(+), 115 deletions(-)

-- 
2.20.1

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Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-24 11:10 Marc Zyngier [this message]
2019-12-24 11:10 ` [PATCH v3 01/32] irqchip/gic-v3: Detect GICv4.1 supporting RVPEID Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 02/32] irqchip/gic-v3: Add GICv4.1 VPEID size discovery Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 03/32] irqchip/gic-v3: Workaround Cavium TX1 erratum when reading GICD_TYPER2 Marc Zyngier
2020-03-09 22:11   ` Robert Richter
2020-03-10 11:41     ` Marc Zyngier
2020-03-10 12:34       ` Robert Richter
2020-03-11  8:45       ` Robert Richter
2020-03-11  9:03         ` Marc Zyngier
2020-03-11  9:18           ` Robert Richter
2019-12-24 11:10 ` [PATCH v3 04/32] irqchip/gic-v3: Use SGIs without active state if offered Marc Zyngier
2019-12-28  8:56   ` Zenghui Yu
2019-12-28 10:36     ` Marc Zyngier
2019-12-30  3:50       ` Zenghui Yu
2019-12-24 11:10 ` [PATCH v3 05/32] irqchip/gic-v4.1: VPE table (aka GICR_VPROPBASER) allocation Marc Zyngier
2020-01-20 14:03   ` Zenghui Yu
2020-01-20 15:11     ` Marc Zyngier
2020-01-22  2:59   ` Zenghui Yu
2019-12-24 11:10 ` [PATCH v3 06/32] irqchip/gic-v4.1: Implement the v4.1 flavour of VMAPP Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 07/32] irqchip/gic-v4.1: Don't use the VPE proxy if RVPEID is set Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 08/32] irqchip/gic-v4.1: Implement the v4.1 flavour of VMOVP Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 09/32] irqchip/gic-v4.1: Plumb skeletal VPE irqchip Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 10/32] irqchip/gic-v4.1: Add mask/unmask doorbell callbacks Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 11/32] irqchip/gic-v4.1: Add VPE residency callback Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 12/32] irqchip/gic-v4.1: Add VPE eviction callback Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 13/32] irqchip/gic-v4.1: Add VPE INVALL callback Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 14/32] irqchip/gic-v4.1: Suppress per-VLPI doorbell Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 15/32] irqchip/gic-v4.1: Allow direct invalidation of VLPIs Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 16/32] irqchip/gic-v4.1: Advertise support v4.1 to KVM Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 17/32] irqchip/gic-v4.1: Map the ITS SGIR register page Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 18/32] irqchip/gic-v4.1: Plumb skeletal VSGI irqchip Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 19/32] irqchip/gic-v4.1: Add initial SGI configuration Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 20/32] irqchip/gic-v4.1: Plumb mask/unmask SGI callbacks Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 21/32] irqchip/gic-v4.1: Plumb get/set_irqchip_state " Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 22/32] irqchip/gic-v4.1: Plumb set_vcpu_affinity " Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 23/32] irqchip/gic-v4.1: Move doorbell management to the GICv4 abstraction layer Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 24/32] irqchip/gic-v4.1: Add VSGI allocation/teardown Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 25/32] irqchip/gic-v4.1: Add VSGI property setup Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 26/32] irqchip/gic-v4.1: Eagerly vmap vPEs Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 27/32] KVM: arm64: GICv4.1: Let doorbells be auto-enabled Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 28/32] KVM: arm64: GICv4.1: Add direct injection capability to SGI registers Marc Zyngier
2019-12-28  9:19   ` Zenghui Yu
2019-12-28 10:41     ` Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 29/32] KVM: arm64: GICv4.1: Allow SGIs to switch between HW and SW interrupts Marc Zyngier
2020-01-15  2:49   ` Shaokun Zhang
2020-01-15  3:49     ` Zenghui Yu
2020-01-15 13:32       ` Marc Zyngier
2020-01-15 13:49         ` Zenghui Yu
2020-01-16  6:13         ` Shaokun Zhang
2020-01-15 13:17     ` Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 30/32] KVM: arm64: GICv4.1: Plumb SGI implementation selection in the distributor Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 31/32] KVM: arm64: GICv4.1: Reload VLPI configuration on distributor enable/disable Marc Zyngier
2019-12-24 11:10 ` [PATCH v3 32/32] KVM: arm64: GICv4.1: Expose HW-based SGIs in debugfs Marc Zyngier

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