1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2021 Western Digital Corporation or its affiliates. 4 * 5 * Authors: 6 * Atish Patra <atish.patra@wdc.com> 7 */ 8 9 #include <linux/errno.h> 10 #include <linux/err.h> 11 #include <linux/kvm_host.h> 12 #include <linux/version.h> 13 #include <asm/sbi.h> 14 #include <asm/kvm_vcpu_sbi.h> 15 16 static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run, 17 unsigned long *out_val, 18 struct kvm_cpu_trap *trap, bool *exit) 19 { 20 int ret = 0; 21 struct kvm_cpu_context *cp = &vcpu->arch.guest_context; 22 23 switch (cp->a6) { 24 case SBI_EXT_BASE_GET_SPEC_VERSION: 25 *out_val = (KVM_SBI_VERSION_MAJOR << 26 SBI_SPEC_VERSION_MAJOR_SHIFT) | 27 KVM_SBI_VERSION_MINOR; 28 break; 29 case SBI_EXT_BASE_GET_IMP_ID: 30 *out_val = KVM_SBI_IMPID; 31 break; 32 case SBI_EXT_BASE_GET_IMP_VERSION: 33 *out_val = LINUX_VERSION_CODE; 34 break; 35 case SBI_EXT_BASE_PROBE_EXT: 36 if ((cp->a0 >= SBI_EXT_EXPERIMENTAL_START && 37 cp->a0 <= SBI_EXT_EXPERIMENTAL_END) || 38 (cp->a0 >= SBI_EXT_VENDOR_START && 39 cp->a0 <= SBI_EXT_VENDOR_END)) { 40 /* 41 * For experimental/vendor extensions 42 * forward it to the userspace 43 */ 44 kvm_riscv_vcpu_sbi_forward(vcpu, run); 45 *exit = true; 46 } else 47 *out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0; 48 break; 49 case SBI_EXT_BASE_GET_MVENDORID: 50 *out_val = vcpu->arch.mvendorid; 51 break; 52 case SBI_EXT_BASE_GET_MARCHID: 53 *out_val = vcpu->arch.marchid; 54 break; 55 case SBI_EXT_BASE_GET_MIMPID: 56 *out_val = vcpu->arch.mimpid; 57 break; 58 default: 59 ret = -EOPNOTSUPP; 60 break; 61 } 62 63 return ret; 64 } 65 66 const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = { 67 .extid_start = SBI_EXT_BASE, 68 .extid_end = SBI_EXT_BASE, 69 .handler = kvm_sbi_ext_base_handler, 70 }; 71 72 static int kvm_sbi_ext_forward_handler(struct kvm_vcpu *vcpu, 73 struct kvm_run *run, 74 unsigned long *out_val, 75 struct kvm_cpu_trap *utrap, 76 bool *exit) 77 { 78 /* 79 * Both SBI experimental and vendor extensions are 80 * unconditionally forwarded to userspace. 81 */ 82 kvm_riscv_vcpu_sbi_forward(vcpu, run); 83 *exit = true; 84 return 0; 85 } 86 87 const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental = { 88 .extid_start = SBI_EXT_EXPERIMENTAL_START, 89 .extid_end = SBI_EXT_EXPERIMENTAL_END, 90 .handler = kvm_sbi_ext_forward_handler, 91 }; 92 93 const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor = { 94 .extid_start = SBI_EXT_VENDOR_START, 95 .extid_end = SBI_EXT_VENDOR_END, 96 .handler = kvm_sbi_ext_forward_handler, 97 }; 98