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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