// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2021 Western Digital Corporation or its affiliates. * * Authors: * Atish Patra <atish.patra@wdc.com> */ #include <linux/errno.h> #include <linux/err.h> #include <linux/kvm_host.h> #include <linux/version.h> #include <asm/sbi.h> #include <asm/kvm_vcpu_sbi.h> static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, struct kvm_vcpu_sbi_return *retdata) { struct kvm_cpu_context *cp = &vcpu->arch.guest_context; const struct kvm_vcpu_sbi_extension *sbi_ext; unsigned long *out_val = &retdata->out_val; switch (cp->a6) { case SBI_EXT_BASE_GET_SPEC_VERSION: *out_val = (KVM_SBI_VERSION_MAJOR << SBI_SPEC_VERSION_MAJOR_SHIFT) | KVM_SBI_VERSION_MINOR; break; case SBI_EXT_BASE_GET_IMP_ID: *out_val = KVM_SBI_IMPID; break; case SBI_EXT_BASE_GET_IMP_VERSION: *out_val = LINUX_VERSION_CODE; break; case SBI_EXT_BASE_PROBE_EXT: if ((cp->a0 >= SBI_EXT_EXPERIMENTAL_START && cp->a0 <= SBI_EXT_EXPERIMENTAL_END) || (cp->a0 >= SBI_EXT_VENDOR_START && cp->a0 <= SBI_EXT_VENDOR_END)) { /* * For experimental/vendor extensions * forward it to the userspace */ return kvm_riscv_vcpu_sbi_forward_handler(vcpu, run, retdata); } else { sbi_ext = kvm_vcpu_sbi_find_ext(vcpu, cp->a0); *out_val = sbi_ext && sbi_ext->probe ? sbi_ext->probe(vcpu) : !!sbi_ext; } break; case SBI_EXT_BASE_GET_MVENDORID: *out_val = vcpu->arch.mvendorid; break; case SBI_EXT_BASE_GET_MARCHID: *out_val = vcpu->arch.marchid; break; case SBI_EXT_BASE_GET_MIMPID: *out_val = vcpu->arch.mimpid; break; default: retdata->err_val = SBI_ERR_NOT_SUPPORTED; break; } return 0; } const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = { .extid_start = SBI_EXT_BASE, .extid_end = SBI_EXT_BASE, .handler = kvm_sbi_ext_base_handler, };