// SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2019 Arm Ltd. #include <linux/arm-smccc.h> #include <linux/kvm_host.h> #include <asm/kvm_emulate.h> #include <kvm/arm_hypercalls.h> #include <kvm/arm_psci.h> int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) { u32 func_id = smccc_get_function(vcpu); long val = SMCCC_RET_NOT_SUPPORTED; u32 feature; gpa_t gpa; switch (func_id) { case ARM_SMCCC_VERSION_FUNC_ID: val = ARM_SMCCC_VERSION_1_1; break; case ARM_SMCCC_ARCH_FEATURES_FUNC_ID: feature = smccc_get_arg1(vcpu); switch (feature) { case ARM_SMCCC_ARCH_WORKAROUND_1: switch (kvm_arm_harden_branch_predictor()) { case KVM_BP_HARDEN_UNKNOWN: break; case KVM_BP_HARDEN_WA_NEEDED: val = SMCCC_RET_SUCCESS; break; case KVM_BP_HARDEN_NOT_REQUIRED: val = SMCCC_RET_NOT_REQUIRED; break; } break; case ARM_SMCCC_ARCH_WORKAROUND_2: switch (kvm_arm_have_ssbd()) { case KVM_SSBD_FORCE_DISABLE: case KVM_SSBD_UNKNOWN: break; case KVM_SSBD_KERNEL: val = SMCCC_RET_SUCCESS; break; case KVM_SSBD_FORCE_ENABLE: case KVM_SSBD_MITIGATED: val = SMCCC_RET_NOT_REQUIRED; break; } break; case ARM_SMCCC_HV_PV_TIME_FEATURES: val = SMCCC_RET_SUCCESS; break; } break; case ARM_SMCCC_HV_PV_TIME_FEATURES: val = kvm_hypercall_pv_features(vcpu); break; case ARM_SMCCC_HV_PV_TIME_ST: gpa = kvm_init_stolen_time(vcpu); if (gpa != GPA_INVALID) val = gpa; break; default: return kvm_psci_call(vcpu); } smccc_set_retval(vcpu, val, 0, 0, 0); return 1; }