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// 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 (arm64_get_spectre_v2_state()) {
case SPECTRE_VULNERABLE:
break;
case SPECTRE_MITIGATED:
val = SMCCC_RET_SUCCESS;
break;
case SPECTRE_UNAFFECTED:
val = SMCCC_RET_NOT_REQUIRED;
break;
}
break;
case ARM_SMCCC_ARCH_WORKAROUND_2:
switch (arm64_get_spectre_v4_state()) {
case SPECTRE_VULNERABLE:
break;
case SPECTRE_MITIGATED:
/*
* SSBS everywhere: Indicate no firmware
* support, as the SSBS support will be
* indicated to the guest and the default is
* safe.
*
* Otherwise, expose a permanent mitigation
* to the guest, and hide SSBS so that the
* guest stays protected.
*/
if (cpus_have_final_cap(ARM64_SSBS))
break;
fallthrough;
case SPECTRE_UNAFFECTED:
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;
}
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