1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (C) 2019 Arm Ltd. 3 4 #include <linux/arm-smccc.h> 5 #include <linux/kvm_host.h> 6 7 #include <asm/kvm_emulate.h> 8 9 #include <kvm/arm_hypercalls.h> 10 #include <kvm/arm_psci.h> 11 12 int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) 13 { 14 u32 func_id = smccc_get_function(vcpu); 15 long val = SMCCC_RET_NOT_SUPPORTED; 16 u32 feature; 17 gpa_t gpa; 18 19 switch (func_id) { 20 case ARM_SMCCC_VERSION_FUNC_ID: 21 val = ARM_SMCCC_VERSION_1_1; 22 break; 23 case ARM_SMCCC_ARCH_FEATURES_FUNC_ID: 24 feature = smccc_get_arg1(vcpu); 25 switch (feature) { 26 case ARM_SMCCC_ARCH_WORKAROUND_1: 27 switch (kvm_arm_harden_branch_predictor()) { 28 case KVM_BP_HARDEN_UNKNOWN: 29 break; 30 case KVM_BP_HARDEN_WA_NEEDED: 31 val = SMCCC_RET_SUCCESS; 32 break; 33 case KVM_BP_HARDEN_NOT_REQUIRED: 34 val = SMCCC_RET_NOT_REQUIRED; 35 break; 36 } 37 break; 38 case ARM_SMCCC_ARCH_WORKAROUND_2: 39 switch (kvm_arm_have_ssbd()) { 40 case KVM_SSBD_FORCE_DISABLE: 41 case KVM_SSBD_UNKNOWN: 42 break; 43 case KVM_SSBD_KERNEL: 44 val = SMCCC_RET_SUCCESS; 45 break; 46 case KVM_SSBD_FORCE_ENABLE: 47 case KVM_SSBD_MITIGATED: 48 val = SMCCC_RET_NOT_REQUIRED; 49 break; 50 } 51 break; 52 case ARM_SMCCC_HV_PV_TIME_FEATURES: 53 val = SMCCC_RET_SUCCESS; 54 break; 55 } 56 break; 57 case ARM_SMCCC_HV_PV_TIME_FEATURES: 58 val = kvm_hypercall_pv_features(vcpu); 59 break; 60 case ARM_SMCCC_HV_PV_TIME_ST: 61 gpa = kvm_init_stolen_time(vcpu); 62 if (gpa != GPA_INVALID) 63 val = gpa; 64 break; 65 default: 66 return kvm_psci_call(vcpu); 67 } 68 69 smccc_set_retval(vcpu, val, 0, 0, 0); 70 return 1; 71 } 72