[PATCH v3 0/2] PSCI system off and reset for KVM ARM/ARM64

[anup.patel@linaro.org (Anup Patel)]

The Power State and Coordination Interface (PSCI) specification defines
SYSTEM_OFF and SYSTEM_RESET functions for system poweroff and reboot.

This patchset adds emulation of PSCI SYSTEM_OFF and SYSTEM_RESET functions
in KVM ARM/ARM64 by forwarding them to user space (QEMU or KVMTOOL) using
KVM_EXIT_SYSTEM_EVENT exit reason.

To try this patch from guest kernel, we will need PSCI-based restart and
poweroff support in the guest kenel for both ARM and ARM64.

Rob Herring has already submitted patches for PSCI-based restart and
poweroff in ARM kernel but these are not merged yet due unstable device
tree bindings of kernel PSCI support. We will be having similar patches
for PSCI-based restart and poweroff in ARM64 kernel.
(Refer http://www.spinics.net/lists/arm-kernel/msg262217.html)
(Refer http://www.spinics.net/lists/devicetree/msg05348.html)

Change Log:

V3:
 - Simplify handle_hvc() for both ARM and ARM64
 - Minor fix in comments for kvm_psci_call()

V2:
 - Replace KVM_EXIT_RESET with KVM_EXIT_SYSTEM_EVENT
 - Make kvm_psci_call() return convention to match
   KVM ARM return convention

V1:
 - Initial revised patch after RFC PATCH.

Anup Patel (2):
  KVM: Add KVM_EXIT_SYSTEM_EVENT to user space API header
  ARM/ARM64: KVM: Forward PSCI SYSTEM_OFF and SYSTEM_RESET to user
    space

 Documentation/virtual/kvm/api.txt |   15 ++++++++++++
 arch/arm/include/asm/kvm_psci.h   |    2 +-
 arch/arm/include/uapi/asm/kvm.h   |    2 ++
 arch/arm/kvm/handle_exit.c        |   11 ++++++---
 arch/arm/kvm/psci.c               |   47 ++++++++++++++++++++++++++++++-------
 arch/arm64/include/asm/kvm_psci.h |    2 +-
 arch/arm64/include/uapi/asm/kvm.h |    2 ++
 arch/arm64/kvm/handle_exit.c      |   10 +++++---
 include/uapi/linux/kvm.h          |    8 +++++++
 9 files changed, 83 insertions(+), 16 deletions(-)

-- 
1.7.9.5