From: Marc Zyngier marc.zyngier@arm.com
commit 58e0b2239a4d997094ba63986ef4de29ddc91d87 upstream.
PSCI 1.0 can be trivially implemented by providing the FEATURES call on top of PSCI 0.2 and returning 1.0 as the PSCI version.
We happily ignore everything else, as they are either optional or are clarifications that do not require any additional change.
PSCI 1.0 is now the default until we decide to add a userspace selection API.
Reviewed-by: Christoffer Dall christoffer.dall@linaro.org Tested-by: Ard Biesheuvel ard.biesheuvel@linaro.org Signed-off-by: Marc Zyngier marc.zyngier@arm.com Signed-off-by: Catalin Marinas catalin.marinas@arm.com [v4.9: account for files moved to virt/ upstream] Signed-off-by: Mark Rutland mark.rutland@arm.com [v4.9 backport] --- arch/arm/kvm/psci.c | 45 ++++++++++++++++++++++++++++++++++++++++++++- include/kvm/arm_psci.h | 3 +++ 2 files changed, 47 insertions(+), 1 deletion(-)
diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c index f579ed9d279b..220eaa04b1c4 100644 --- a/arch/arm/kvm/psci.c +++ b/arch/arm/kvm/psci.c @@ -232,7 +232,7 @@ static void kvm_psci_system_reset(struct kvm_vcpu *vcpu) int kvm_psci_version(struct kvm_vcpu *vcpu) { if (test_bit(KVM_ARM_VCPU_PSCI_0_2, vcpu->arch.features)) - return KVM_ARM_PSCI_0_2; + return KVM_ARM_PSCI_LATEST;
return KVM_ARM_PSCI_0_1; } @@ -311,6 +311,47 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu) return ret; }
+static int kvm_psci_1_0_call(struct kvm_vcpu *vcpu) +{ + u32 psci_fn = smccc_get_function(vcpu); + u32 feature; + unsigned long val; + int ret = 1; + + switch(psci_fn) { + case PSCI_0_2_FN_PSCI_VERSION: + val = KVM_ARM_PSCI_1_0; + break; + case PSCI_1_0_FN_PSCI_FEATURES: + feature = smccc_get_arg1(vcpu); + switch(feature) { + case PSCI_0_2_FN_PSCI_VERSION: + case PSCI_0_2_FN_CPU_SUSPEND: + case PSCI_0_2_FN64_CPU_SUSPEND: + case PSCI_0_2_FN_CPU_OFF: + case PSCI_0_2_FN_CPU_ON: + case PSCI_0_2_FN64_CPU_ON: + case PSCI_0_2_FN_AFFINITY_INFO: + case PSCI_0_2_FN64_AFFINITY_INFO: + case PSCI_0_2_FN_MIGRATE_INFO_TYPE: + case PSCI_0_2_FN_SYSTEM_OFF: + case PSCI_0_2_FN_SYSTEM_RESET: + case PSCI_1_0_FN_PSCI_FEATURES: + val = 0; + break; + default: + val = PSCI_RET_NOT_SUPPORTED; + break; + } + break; + default: + return kvm_psci_0_2_call(vcpu); + } + + smccc_set_retval(vcpu, val, 0, 0, 0); + return ret; +} + static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu) { struct kvm *kvm = vcpu->kvm; @@ -353,6 +394,8 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu) int kvm_psci_call(struct kvm_vcpu *vcpu) { switch (kvm_psci_version(vcpu)) { + case KVM_ARM_PSCI_1_0: + return kvm_psci_1_0_call(vcpu); case KVM_ARM_PSCI_0_2: return kvm_psci_0_2_call(vcpu); case KVM_ARM_PSCI_0_1: diff --git a/include/kvm/arm_psci.h b/include/kvm/arm_psci.h index 5659343580a3..32360432cff5 100644 --- a/include/kvm/arm_psci.h +++ b/include/kvm/arm_psci.h @@ -22,6 +22,9 @@
#define KVM_ARM_PSCI_0_1 PSCI_VERSION(0, 1) #define KVM_ARM_PSCI_0_2 PSCI_VERSION(0, 2) +#define KVM_ARM_PSCI_1_0 PSCI_VERSION(1, 0) + +#define KVM_ARM_PSCI_LATEST KVM_ARM_PSCI_1_0
int kvm_psci_version(struct kvm_vcpu *vcpu); int kvm_psci_call(struct kvm_vcpu *vcpu);