[PATCH v4 00/10] In-kernel PSCI v0.2 emulation for KVM ARM/ARM64

[Anup Patel]

Currently, KVM ARM/ARM64 only provides in-kernel emulation of Power State
and Coordination Interface (PSCI) v0.1.

This patchset aims at providing newer PSCI v0.2 for KVM ARM/ARM64 VCPUs
such that it does not break current KVM ARM/ARM64 ABI. Also, the patchset
provides emulation of only few PSCI v0.2 functions such as PSCI_VERSION,
CPU_ON, and CPU_OFF. Emulation of other PSCI v0.2 functions will be added
later.

The user space tools (i.e. QEMU or KVMTOOL) will have to explicitly enable
KVM_ARM_VCPU_PSCI_0_2 feature using KVM_ARM_VCPU_INIT ioctl for providing
PSCI v0.2 to VCPUs.

Changlog:

V4:
 - Implement all mandatory functions required by PSCI v0.2

V3:
 - Make KVM_ARM_VCPU_PSCI_0_2 feature experiementatl for now so that
   it fails for user space till all mandatory PSCI v0.2 functions are
   emulated by KVM ARM/ARM64
 - Have separate patch for making KVM_ARM_VCPU_PSCI_0_2 feature available
   to user space. This patch can be defferred for now

V2:
 - Don't rename PSCI return values KVM_PSCI_RET_NI and KVM_PSCI_RET_INVAL
 - Added kvm_psci_version() to get PSCI version available to VCPU
 - Fixed grammer in Documentation/virtual/kvm/api.txt

V1:
 - Initial RFC PATCH

Anup Patel (10):
  KVM: Add capability to advertise PSCI v0.2 support
  ARM/ARM64: KVM: Add base for PSCI v0.2 emulation
  KVM: Documentation: Add info regarding KVM_ARM_VCPU_PSCI_0_2 feature
  ARM/ARM64: KVM: Make kvm_psci_call() return convention more flexible
  KVM: Add KVM_EXIT_SYSTEM_EVENT to user space API header
  ARM/ARM64: KVM: Emulate PSCI v0.2 SYSTEM_OFF and SYSTEM_RESET
  ARM/ARM64: KVM: Emulate PSCI v0.2 AFFINITY_INFO
  ARM/ARM64: KVM: Emulate PSCI v0.2 MIGRATE_INFO_TYPE and related
    functions
  ARM/ARM64: KVM: Fix CPU_ON emulation for PSCI v0.2
  ARM/ARM64: KVM: Emulate PSCI v0.2 CPU_SUSPEND

 Documentation/virtual/kvm/api.txt |   17 +++
 arch/arm/include/asm/kvm_host.h   |    7 +-
 arch/arm/include/asm/kvm_psci.h   |    7 +-
 arch/arm/include/uapi/asm/kvm.h   |   35 ++++-
 arch/arm/kvm/arm.c                |    1 +
 arch/arm/kvm/handle_exit.c        |   10 +-
 arch/arm/kvm/psci.c               |  270 ++++++++++++++++++++++++++++++++++---
 arch/arm/kvm/reset.c              |    4 +
 arch/arm64/include/asm/kvm_host.h |    7 +-
 arch/arm64/include/asm/kvm_psci.h |    7 +-
 arch/arm64/include/uapi/asm/kvm.h |   35 ++++-
 arch/arm64/kvm/handle_exit.c      |   10 +-
 arch/arm64/kvm/reset.c            |    4 +
 include/uapi/linux/kvm.h          |    9 ++
 14 files changed, 395 insertions(+), 28 deletions(-)

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1.7.9.5