On Tue, Feb 04, 2014 at 03:18:12PM +0530, Anup Patel wrote:
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:
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.
I think we just want the feature bit when there's proper PSCI 0.2 support as per Mark's comments, so I'll hold off with reviewing until we have a more complete patch set.
Thanks, -Christoffer