1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /**
3  * Copyright (c) 2021 Western Digital Corporation or its affiliates.
4  *
5  * Authors:
6  *     Atish Patra <atish.patra@wdc.com>
7  */
8 
9 #ifndef __RISCV_KVM_VCPU_SBI_H__
10 #define __RISCV_KVM_VCPU_SBI_H__
11 
12 #define KVM_SBI_IMPID 3
13 
14 #define KVM_SBI_VERSION_MAJOR 1
15 #define KVM_SBI_VERSION_MINOR 0
16 
17 struct kvm_vcpu_sbi_context {
18 	int return_handled;
19 	bool extension_disabled[KVM_RISCV_SBI_EXT_MAX];
20 };
21 
22 struct kvm_vcpu_sbi_return {
23 	unsigned long out_val;
24 	unsigned long err_val;
25 	struct kvm_cpu_trap *utrap;
26 	bool uexit;
27 };
28 
29 struct kvm_vcpu_sbi_extension {
30 	unsigned long extid_start;
31 	unsigned long extid_end;
32 	/**
33 	 * SBI extension handler. It can be defined for a given extension or group of
34 	 * extension. But it should always return linux error codes rather than SBI
35 	 * specific error codes.
36 	 */
37 	int (*handler)(struct kvm_vcpu *vcpu, struct kvm_run *run,
38 		       struct kvm_vcpu_sbi_return *retdata);
39 
40 	/* Extension specific probe function */
41 	unsigned long (*probe)(struct kvm_vcpu *vcpu);
42 };
43 
44 void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
45 void kvm_riscv_vcpu_sbi_system_reset(struct kvm_vcpu *vcpu,
46 				     struct kvm_run *run,
47 				     u32 type, u64 flags);
48 int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
49 int kvm_riscv_vcpu_set_reg_sbi_ext(struct kvm_vcpu *vcpu,
50 				   const struct kvm_one_reg *reg);
51 int kvm_riscv_vcpu_get_reg_sbi_ext(struct kvm_vcpu *vcpu,
52 				   const struct kvm_one_reg *reg);
53 const struct kvm_vcpu_sbi_extension *kvm_vcpu_sbi_find_ext(
54 				struct kvm_vcpu *vcpu, unsigned long extid);
55 int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run);
56 
57 #ifdef CONFIG_RISCV_SBI_V01
58 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01;
59 #endif
60 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base;
61 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_time;
62 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_ipi;
63 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_rfence;
64 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_srst;
65 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_hsm;
66 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_experimental;
67 extern const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_vendor;
68 
69 #endif /* __RISCV_KVM_VCPU_SBI_H__ */
70