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86 lines
2.0 KiB
86 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2019 Arm Ltd. |
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#include <linux/arm-smccc.h> |
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#include <linux/kvm_host.h> |
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#include <asm/kvm_emulate.h> |
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#include <kvm/arm_hypercalls.h> |
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#include <kvm/arm_psci.h> |
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int kvm_hvc_call_handler(struct kvm_vcpu *vcpu) |
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{ |
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u32 func_id = smccc_get_function(vcpu); |
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long val = SMCCC_RET_NOT_SUPPORTED; |
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u32 feature; |
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gpa_t gpa; |
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switch (func_id) { |
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case ARM_SMCCC_VERSION_FUNC_ID: |
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val = ARM_SMCCC_VERSION_1_1; |
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break; |
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case ARM_SMCCC_ARCH_FEATURES_FUNC_ID: |
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feature = smccc_get_arg1(vcpu); |
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switch (feature) { |
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case ARM_SMCCC_ARCH_WORKAROUND_1: |
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switch (arm64_get_spectre_v2_state()) { |
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case SPECTRE_VULNERABLE: |
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break; |
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case SPECTRE_MITIGATED: |
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val = SMCCC_RET_SUCCESS; |
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break; |
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case SPECTRE_UNAFFECTED: |
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val = SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED; |
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break; |
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} |
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break; |
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case ARM_SMCCC_ARCH_WORKAROUND_2: |
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switch (arm64_get_spectre_v4_state()) { |
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case SPECTRE_VULNERABLE: |
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break; |
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case SPECTRE_MITIGATED: |
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/* |
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* SSBS everywhere: Indicate no firmware |
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* support, as the SSBS support will be |
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* indicated to the guest and the default is |
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* safe. |
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* |
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* Otherwise, expose a permanent mitigation |
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* to the guest, and hide SSBS so that the |
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* guest stays protected. |
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*/ |
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if (cpus_have_final_cap(ARM64_SSBS)) |
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break; |
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fallthrough; |
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case SPECTRE_UNAFFECTED: |
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val = SMCCC_RET_NOT_REQUIRED; |
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break; |
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} |
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break; |
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case ARM_SMCCC_HV_PV_TIME_FEATURES: |
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val = SMCCC_RET_SUCCESS; |
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break; |
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} |
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break; |
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case ARM_SMCCC_HV_PV_TIME_FEATURES: |
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val = kvm_hypercall_pv_features(vcpu); |
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break; |
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case ARM_SMCCC_HV_PV_TIME_ST: |
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gpa = kvm_init_stolen_time(vcpu); |
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if (gpa != GPA_INVALID) |
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val = gpa; |
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break; |
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case ARM_SMCCC_TRNG_VERSION: |
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case ARM_SMCCC_TRNG_FEATURES: |
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case ARM_SMCCC_TRNG_GET_UUID: |
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case ARM_SMCCC_TRNG_RND32: |
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case ARM_SMCCC_TRNG_RND64: |
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return kvm_trng_call(vcpu); |
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default: |
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return kvm_psci_call(vcpu); |
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} |
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smccc_set_retval(vcpu, val, 0, 0, 0); |
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return 1; |
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}
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