[PATCH v10 0/8] arm/arm64: vgic: Implement API for vGICv3 live migration

[Christoffer Dall]

Hi Vijaya,

On Thu, Dec 01, 2016 at 12:39:39PM +0530, vijay.kilari at gmail.com wrote:
> 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
> Documentation/virtual/kvm/devices/arm-vgic-v3.txt
> 
> The patch 3 & 4 are picked from the Pavel's previous implementation.
> http://www.spinics.net/lists/kvm/msg122040.html
> 
> NOTE: Only compilation tested for AArch32. No hardware to test.
> 

I'm mostly happy with this series at this point, and everything beyond
the ABI discussion can be fixed later if we should spot anything.

Assuming we can agree on the API for the level_info shortly, can you
address the other comments in the series and reabse on v4.10-rc4 (or rc5
if that's out when you get there) and send out a new version that we can
queue?

Thanks,
-Christoffer


> v9 => v10:
>  - Dropped support for AArch32 mode.
>  - Fixed line level update
>  - Updated documentation
>  - Moved vgic-sys-reg-v3.c to arch/arm64/kvm/ and
>    added vgic-v3-coproc.c to arch/arm/kvm for AArch32
>  - Fixed nits
> 
> v8 => v9:
>  - Rebased to kvmarm/next branch
>  - Introduce support for save and restore of CPU interface
>    registers for AArch32 mode (9,10 and 11 patches).
>    Only compilation tested.
>  - Fixed vmcr.ctlr format
>  - Updated error code for invalid CPU REG value in Documentation
>  - Updated commit messages and added comments required
>  - Queued IRQ when irq_line is set.
>  - Compatibility check on ICC_CTLR_EL1.SEIS and A3V
> 
> v7 => v8:
>  - Rebased to 4.9-rc3
>  - Fixed wrong parameter to VGIC_TO_MPIDR
> v6 => v7:
>  - Rename all patches heading from vgic-new to vgic
>  - Moved caching of priority and ID bits from vgic global struct
>    to vgic_cpu struct.
> 
> v5 => v6:
>  - Collated all register definitions to single patch (4)
>  - Introduce macro to convert userspace MPIDR format to MPIDR reg format
>  - Check on ICC_CTLR_EL1.CBPR value is made while accessing ICC_BPR1_EL1
>  - Cached ich_vtr_el2 and guests priority and ID bits
>  - Check on number of priority and ID bits when ICC_CTRL_EL1 write is made
>  - Check is made on SRE bit for ICC_SRE_EL1 write
> 
> v4 => v5:
>  - ICC_CTLR_EL1 access is updated to reflect HW values
>  - Updated ICC reg access mask and shift macros
>  - Introduced patch 4 for VMCR changes
>  - Other minor fixes.
> 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 (8):
>   arm/arm64: vgic: Implement support for userspace access
>   arm/arm64: vgic: Add distributor and redistributor access
>   arm/arm64: vgic: Introduce find_reg_by_id()
>   irqchip/gic-v3: Add missing system register definitions
>   arm/arm64: vgic: Introduce VENG0 and VENG1 fields to vmcr struct
>   arm/arm64: vgic: Implement VGICv3 CPU interface access
>   arm/arm64: vgic: Implement KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO ioctl
>   arm/arm64: Documentation: Update arm-vgic-v3.txt
> 
>  Documentation/virtual/kvm/devices/arm-vgic-v3.txt |   9 +-
>  arch/arm/include/uapi/asm/kvm.h                   |  13 +
>  arch/arm/kvm/Makefile                             |   4 +-
>  arch/arm/kvm/vgic-v3-coproc.c                     |  35 +++
>  arch/arm64/include/uapi/asm/kvm.h                 |  13 +
>  arch/arm64/kvm/Makefile                           |   3 +-
>  arch/arm64/kvm/sys_regs.c                         |  22 +-
>  arch/arm64/kvm/sys_regs.h                         |   4 +
>  arch/arm64/kvm/vgic-sys-reg-v3.c                  | 338 ++++++++++++++++++++++
>  include/kvm/arm_vgic.h                            |   9 +
>  include/linux/irqchip/arm-gic-v3.h                |  45 ++-
>  virt/kvm/arm/vgic/vgic-kvm-device.c               | 215 +++++++++++++-
>  virt/kvm/arm/vgic/vgic-mmio-v2.c                  |  57 +---
>  virt/kvm/arm/vgic/vgic-mmio-v3.c                  | 204 +++++++++++--
>  virt/kvm/arm/vgic/vgic-mmio.c                     | 162 ++++++++++-
>  virt/kvm/arm/vgic/vgic-mmio.h                     |  28 ++
>  virt/kvm/arm/vgic/vgic-v3.c                       |  28 +-
>  virt/kvm/arm/vgic/vgic.h                          |  60 +++-
>  18 files changed, 1144 insertions(+), 105 deletions(-)
>  create mode 100644 arch/arm/kvm/vgic-v3-coproc.c
>  create mode 100644 arch/arm64/kvm/vgic-sys-reg-v3.c
> 
> -- 
> 1.9.1
>