[PATCH v5 00/10] Support VGIC save/restore using device control API

[Marc Zyngier]

On 2013-12-17 05:29, Christoffer Dall wrote:
> Implement save/restore of the VGIC state using the newer KVM Device
> Control API.  This requries some number of changes to existing code 
> in
> addition to actually supporting save/restore of the necessary state.
>
> The first patches (01-03) support creating the VGIC using the Device
> Control API.  This change is necessary because there are no other
> suitable KVM APIs that we can leverage to access the VGIC state from
> user space and the device control API was crafted exactly for this
> purpose.
>
> Subsequent patches add the missing infrastructure and user space API
> pieces necessary to actually save and restore the VGIC state.  The 
> GIC
> v2.0 architecture specification already specifies registers that can 
> be
> used to save and restore the complete VGIC state for suspend/resume
> purposes on real hardware, and we can reuse this interface for the
> VGIC.  The API is therefore based on the memory-mapped register 
> accesses
> defined in the specs.  See the individual patches for details.
>
> The patches are based on kvm-arm-next with the arch timers 
> save/restore
> patches applied:
> git://git.linaro.org/people/cdall/linux-kvm-arm.git timer-migrate-v4
>
> This patch series based on the above can be cloned from:
> git://git.linaro.org/people/cdall/linux-kvm-arm.git vgic-migrate-v5
>
> User space patches for QEMU have also been posted on the list, but an
> updated version is underway.  Tested on Versatile Express TC2.

Hi Christoffer,

I believe this is now good to go, assuming the userspace interface is 
stable.
If it is, I'll merge the above branch for 3.14.

Thanks,

         M.

> Changelogs in the individual patches.
>
> Christoffer Dall (10):
>   ARM: KVM: Allow creating the VGIC after VCPUs
>   KVM: arm-vgic: Support KVM_CREATE_DEVICE for VGIC
>   KVM: arm-vgic: Set base addr through device API
>   irqchip: arm-gic: Define additional MMIO offsets and masks
>   KVM: arm-vgic: Make vgic mmio functions more generic
>   arm/arm64: kvm: Set vcpu->cpu to -1 on vcpu_put
>   KVM: arm-vgic: Add vgic reg access from dev attr
>   KVM: arm-vgic: Support unqueueing of LRs to the dist
>   KVM: arm-vgic: Add GICD_SPENDSGIR and GICD_CPENDSGIR handlers
>   KVM: arm-vgic: Support CPU interface reg access
>
>  Documentation/virtual/kvm/api.txt              |   7 +-
>  Documentation/virtual/kvm/devices/arm-vgic.txt |  73 ++++
>  arch/arm/include/uapi/asm/kvm.h                |   8 +
>  arch/arm/kvm/arm.c                             |  17 +-
>  include/kvm/arm_vgic.h                         |   2 +-
>  include/linux/irqchip/arm-gic.h                |  12 +
>  include/linux/kvm_host.h                       |   1 +
>  include/uapi/linux/kvm.h                       |   1 +
>  virt/kvm/arm/vgic.c                            | 583
> +++++++++++++++++++++++--
>  virt/kvm/kvm_main.c                            |   5 +
>  10 files changed, 672 insertions(+), 37 deletions(-)
>  create mode 100644 Documentation/virtual/kvm/devices/arm-vgic.txt

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