1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2019 Arm Ltd.
4 #include <linux/arm-smccc.h>
5 #include <linux/kvm_host.h>
7 #include <asm/kvm_emulate.h>
9 #include <kvm/arm_hypercalls.h>
10 #include <kvm/arm_psci.h>
12 int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
14 u32 func_id = smccc_get_function(vcpu);
15 long val = SMCCC_RET_NOT_SUPPORTED;
20 case ARM_SMCCC_VERSION_FUNC_ID:
21 val = ARM_SMCCC_VERSION_1_1;
23 case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
24 feature = smccc_get_arg1(vcpu);
26 case ARM_SMCCC_ARCH_WORKAROUND_1:
27 switch (kvm_arm_harden_branch_predictor()) {
28 case KVM_BP_HARDEN_UNKNOWN:
30 case KVM_BP_HARDEN_WA_NEEDED:
31 val = SMCCC_RET_SUCCESS;
33 case KVM_BP_HARDEN_NOT_REQUIRED:
34 val = SMCCC_RET_NOT_REQUIRED;
38 case ARM_SMCCC_ARCH_WORKAROUND_2:
39 switch (kvm_arm_have_ssbd()) {
40 case KVM_SSBD_FORCE_DISABLE:
41 case KVM_SSBD_UNKNOWN:
44 val = SMCCC_RET_SUCCESS;
46 case KVM_SSBD_FORCE_ENABLE:
47 case KVM_SSBD_MITIGATED:
48 val = SMCCC_RET_NOT_REQUIRED;
52 case ARM_SMCCC_HV_PV_TIME_FEATURES:
53 val = SMCCC_RET_SUCCESS;
57 case ARM_SMCCC_HV_PV_TIME_FEATURES:
58 val = kvm_hypercall_pv_features(vcpu);
60 case ARM_SMCCC_HV_PV_TIME_ST:
61 gpa = kvm_init_stolen_time(vcpu);
62 if (gpa != GPA_INVALID)
66 return kvm_psci_call(vcpu);
69 smccc_set_retval(vcpu, val, 0, 0, 0);