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100 lines
2.6 KiB
100 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2021 Western Digital Corporation or its affiliates. |
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* |
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* Authors: |
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* Atish Patra <[email protected]> |
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*/ |
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#include <linux/errno.h> |
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#include <linux/err.h> |
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#include <linux/kvm_host.h> |
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#include <linux/version.h> |
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#include <asm/csr.h> |
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#include <asm/sbi.h> |
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#include <asm/kvm_vcpu_timer.h> |
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#include <asm/kvm_vcpu_sbi.h> |
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static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, |
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unsigned long *out_val, |
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struct kvm_cpu_trap *trap, bool *exit) |
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{ |
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int ret = 0; |
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struct kvm_cpu_context *cp = &vcpu->arch.guest_context; |
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struct sbiret ecall_ret; |
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switch (cp->a6) { |
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case SBI_EXT_BASE_GET_SPEC_VERSION: |
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*out_val = (KVM_SBI_VERSION_MAJOR << |
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SBI_SPEC_VERSION_MAJOR_SHIFT) | |
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KVM_SBI_VERSION_MINOR; |
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break; |
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case SBI_EXT_BASE_GET_IMP_ID: |
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*out_val = KVM_SBI_IMPID; |
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break; |
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case SBI_EXT_BASE_GET_IMP_VERSION: |
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*out_val = LINUX_VERSION_CODE; |
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break; |
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case SBI_EXT_BASE_PROBE_EXT: |
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if ((cp->a0 >= SBI_EXT_EXPERIMENTAL_START && |
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cp->a0 <= SBI_EXT_EXPERIMENTAL_END) || |
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(cp->a0 >= SBI_EXT_VENDOR_START && |
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cp->a0 <= SBI_EXT_VENDOR_END)) { |
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/* |
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* For experimental/vendor extensions |
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* forward it to the userspace |
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*/ |
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kvm_riscv_vcpu_sbi_forward(vcpu, run); |
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*exit = true; |
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} else |
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*out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0; |
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break; |
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case SBI_EXT_BASE_GET_MVENDORID: |
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case SBI_EXT_BASE_GET_MARCHID: |
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case SBI_EXT_BASE_GET_MIMPID: |
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ecall_ret = sbi_ecall(SBI_EXT_BASE, cp->a6, 0, 0, 0, 0, 0, 0); |
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if (!ecall_ret.error) |
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*out_val = ecall_ret.value; |
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/*TODO: We are unnecessarily converting the error twice */ |
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ret = sbi_err_map_linux_errno(ecall_ret.error); |
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break; |
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default: |
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ret = -EOPNOTSUPP; |
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break; |
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} |
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return ret; |
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} |
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = { |
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.extid_start = SBI_EXT_BASE, |
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.extid_end = SBI_EXT_BASE, |
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.handler = kvm_sbi_ext_base_handler, |
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}; |
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static int kvm_sbi_ext_forward_handler(struct kvm_vcpu *vcpu, |
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struct kvm_run *run, |
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unsigned long *out_val, |
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struct kvm_cpu_trap *utrap, |
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bool *exit) |
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{ |
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/* |
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* Both SBI experimental and vendor extensions are |
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* unconditionally forwarded to userspace. |
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*/ |
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kvm_riscv_vcpu_sbi_forward(vcpu, run); |
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*exit = true; |
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return 0; |
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} |
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental = { |
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.extid_start = SBI_EXT_EXPERIMENTAL_START, |
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.extid_end = SBI_EXT_EXPERIMENTAL_END, |
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.handler = kvm_sbi_ext_forward_handler, |
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}; |
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const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor = { |
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.extid_start = SBI_EXT_VENDOR_START, |
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.extid_end = SBI_EXT_VENDOR_END, |
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.handler = kvm_sbi_ext_forward_handler, |
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};
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