[PATCH v4 0/5] arm/arm64: vgic-new: Implement API for vGICv3 live migration

[vijay.kilari at gmail.com]

From: Vijaya Kumar K <Vijaya.Kumar at cavium.com>

This patchset adds API for saving and restoring
of VGICv3 registers to support live migration with new vgic feature.
This API definition is as per version of VGICv3 specification
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-July/445611.html

Compatible live migration QEMU patches will be sent later.

The patch 3 & 4 are picked from the Pavel's previous implementation.
http://www.spinics.net/lists/kvm/msg122040.html

v3 => v4:
 - Rebased to latest code base
 - Moved vgic_uaccess() from vgic-mmio-v2.c to vgic-mmio.c
 - Dropped macro REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED_UACCESS
 - Dropped LE conversion for userspace access
 - Introduced vgic_uaccess_write_pending() for ISPENDR write
 - Change macro KVM_DEV_ARM_VGIC_V3_CPUID_MASK to KVM_DEV_ARM_VGIC_V3_MIDR_MASK
 - Refactored some code as common code.
 - Changed handing of ICC_* registers
 - Allowed ICC_SRE_EL1 read by userspace
 - Fixed KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_* macros

v2 => v3:
 - Implemented separate API for ISPENDR and ICPENDR to
   read soft_pending instead of pending for level triggerred interrupts
 - Implemented ioctl KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO to access line level
 - Rebased on top of Christoffer's patch set
   http://www.spinics.net/lists/kvm/msg136840.html

 NOTE: GICD_STATUSR and GICR_STATUSR are implemented as RAZ/WI.

v1 => v2:
 - The init sequence change patch is no more required.
   Fixed in patch 2 by using static vgic_io_dev regions structure instead
   of using dynamic allocation pointer.
 - Updated commit message of patch 4.
 - Dropped usage of union to manage 32-bit and 64-bit access in patch 1.
   Used local variable for 32-bit access.
 - Updated macro __ARM64_SYS_REG and ARM64_SYS_REG in
   arch/arm64/include/uapi/asm/kvm.h as per qemu requirements.

Vijaya Kumar K (5):
  arm/arm64: vgic-new: Implement support for userspace access
  arm/arm64: vgic-new: Add distributor and redistributor access
  arm/arm64: vgic-new: Introduce find_reg_by_id()
  arm/arm64: vgic-new: Implement VGICv3 CPU interface access
  arm/arm64: vgic-new: Implement KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO ioctl

 arch/arm64/include/uapi/asm/kvm.h   |  13 ++
 arch/arm64/kvm/Makefile             |   1 +
 arch/arm64/kvm/sys_regs.c           |  22 ++-
 arch/arm64/kvm/sys_regs.h           |   4 +
 include/linux/irqchip/arm-gic-v3.h  |  32 ++++-
 virt/kvm/arm/vgic/vgic-kvm-device.c | 213 ++++++++++++++++++++++++++++-
 virt/kvm/arm/vgic/vgic-mmio-v2.c    |  57 +-------
 virt/kvm/arm/vgic/vgic-mmio-v3.c    | 143 +++++++++++++++++---
 virt/kvm/arm/vgic/vgic-mmio.c       | 199 +++++++++++++++++++++++++--
 virt/kvm/arm/vgic/vgic-mmio.h       |  35 +++++
 virt/kvm/arm/vgic/vgic-sys-reg-v3.c | 261 ++++++++++++++++++++++++++++++++++++
 virt/kvm/arm/vgic/vgic-v3.c         |   4 +
 virt/kvm/arm/vgic/vgic.h            |  23 ++++
 13 files changed, 914 insertions(+), 93 deletions(-)
 create mode 100644 virt/kvm/arm/vgic/vgic-sys-reg-v3.c

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1.9.1