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
kvm_sbi_ext_base_handler(struct kvm_vcpu * vcpu,struct kvm_run * run,struct kvm_vcpu_sbi_return * retdata)16 static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
17 struct kvm_vcpu_sbi_return *retdata)
18 {
19 struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
20 const struct kvm_vcpu_sbi_extension *sbi_ext;
21 unsigned long *out_val = &retdata->out_val;
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 return kvm_riscv_vcpu_sbi_forward_handler(vcpu, run, retdata);
45 } else {
46 sbi_ext = kvm_vcpu_sbi_find_ext(vcpu, cp->a0);
47 *out_val = sbi_ext && sbi_ext->probe ?
48 sbi_ext->probe(vcpu) : !!sbi_ext;
49 }
50 break;
51 case SBI_EXT_BASE_GET_MVENDORID:
52 *out_val = vcpu->arch.mvendorid;
53 break;
54 case SBI_EXT_BASE_GET_MARCHID:
55 *out_val = vcpu->arch.marchid;
56 break;
57 case SBI_EXT_BASE_GET_MIMPID:
58 *out_val = vcpu->arch.mimpid;
59 break;
60 default:
61 retdata->err_val = SBI_ERR_NOT_SUPPORTED;
62 break;
63 }
64
65 return 0;
66 }
67
68 const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_base = {
69 .extid_start = SBI_EXT_BASE,
70 .extid_end = SBI_EXT_BASE,
71 .handler = kvm_sbi_ext_base_handler,
72 };
73