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.
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:
V10: - Updated PSCI_VERSION_xxx defines in uapi/linux/psci.h - Added PSCI_0_2_AFFINITY_LEVEL_xxxx defines in uapi/linux/psci.h - Removed PSCI v0.1 related defines from uapi/linux/psci.h - Inject undefined exception for all types of errors in PSCI emulation (i.e kvm_psci_call(vcpu) < 0) - Removed "inline" attribute of kvm_prepare_system_event() - Store INTERNAL_FAILURE in r0 (or x0) before exiting to userspace - Use MPIDR_LEVEL_BITS in AFFINITY_MASK define - Updated comment in kvm_psci_vcpu_suspend() as-per Marc's suggestion
V9: - Rename undefined PSCI_VER_xxx defines to PSCI_VERSION_xxx defines
V8: - Add #define for possible values of migrate type in uapi/linux/psci.h - Simplified psci_affinity_mask() in psci.c - Update comments in kvm_psci_vcpu_suspend() to indicate that for KVM wakeup events are interrupts. - Unconditionally update r0 (or x0) in kvm_psci_vcpu_on()
V7: - Make uapi/linux/psci.h inline with Ashwin's patch http://www.spinics.net/lists/arm-kernel/msg319090.html - Incorporate Rob's suggestions for uapi/linux/psci.h - Treat CPU_SUSPEND power-down request to be same as standby request. This further simplifies CPU_SUSPEND emulation.
V6: - Introduce uapi/linux/psci.h for sharing PSCI defines between ARM kernel, ARM64 kernel, KVM ARM/ARM64 and user space - Make CPU_SUSPEND emulation similar to WFI emulation
V5: - Have separate last patch to advertise KVM_CAP_ARM_PSCI_0_2 - Use kvm_psci_version() in kvm_psci_vcpu_on() - Return ALREADY_ON for PSCI v0.2 CPU_ON if VCPU is not paused - Remove per-VCPU suspend context - As-per PSCI v0.2 spec, only current CPU can suspend itself
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 (12): KVM: Add capability to advertise PSCI v0.2 support ARM/ARM64: KVM: Add common header for PSCI related defines 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 ARM/ARM64: KVM: Advertise KVM_CAP_ARM_PSCI_0_2 to user space
Documentation/virtual/kvm/api.txt | 17 +++ arch/arm/include/asm/kvm_host.h | 2 +- arch/arm/include/asm/kvm_psci.h | 6 +- arch/arm/include/uapi/asm/kvm.h | 10 +- arch/arm/kvm/arm.c | 1 + arch/arm/kvm/handle_exit.c | 10 +- arch/arm/kvm/psci.c | 221 +++++++++++++++++++++++++++++++++---- arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/include/asm/kvm_psci.h | 6 +- arch/arm64/include/uapi/asm/kvm.h | 10 +- arch/arm64/kvm/handle_exit.c | 10 +- include/uapi/linux/Kbuild | 1 + include/uapi/linux/kvm.h | 9 ++ include/uapi/linux/psci.h | 85 ++++++++++++++ 14 files changed, 353 insertions(+), 37 deletions(-) create mode 100644 include/uapi/linux/psci.h