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 <asm/sbi.h>
13 #include <asm/kvm_vcpu_timer.h>
14 #include <asm/kvm_vcpu_sbi.h>
15
kvm_sbi_ext_v01_handler(struct kvm_vcpu * vcpu,struct kvm_run * run,struct kvm_vcpu_sbi_return * retdata)16 static int kvm_sbi_ext_v01_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
17 struct kvm_vcpu_sbi_return *retdata)
18 {
19 ulong hmask;
20 int i, ret = 0;
21 u64 next_cycle;
22 struct kvm_vcpu *rvcpu;
23 struct kvm *kvm = vcpu->kvm;
24 struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
25 struct kvm_cpu_trap *utrap = retdata->utrap;
26 unsigned long vmid;
27
28 switch (cp->a7) {
29 case SBI_EXT_0_1_CONSOLE_GETCHAR:
30 case SBI_EXT_0_1_CONSOLE_PUTCHAR:
31 /*
32 * The CONSOLE_GETCHAR/CONSOLE_PUTCHAR SBI calls cannot be
33 * handled in kernel so we forward these to user-space
34 */
35 kvm_riscv_vcpu_sbi_forward(vcpu, run);
36 retdata->uexit = true;
37 break;
38 case SBI_EXT_0_1_SET_TIMER:
39 #if __riscv_xlen == 32
40 next_cycle = ((u64)cp->a1 << 32) | (u64)cp->a0;
41 #else
42 next_cycle = (u64)cp->a0;
43 #endif
44 ret = kvm_riscv_vcpu_timer_next_event(vcpu, next_cycle);
45 break;
46 case SBI_EXT_0_1_CLEAR_IPI:
47 ret = kvm_riscv_vcpu_unset_interrupt(vcpu, IRQ_VS_SOFT);
48 break;
49 case SBI_EXT_0_1_SEND_IPI:
50 if (cp->a0)
51 hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0, utrap);
52 else
53 hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
54 if (utrap->scause)
55 break;
56
57 for_each_set_bit(i, &hmask, BITS_PER_LONG) {
58 rvcpu = kvm_get_vcpu_by_id(vcpu->kvm, i);
59 ret = kvm_riscv_vcpu_set_interrupt(rvcpu, IRQ_VS_SOFT);
60 if (ret < 0)
61 break;
62 }
63 break;
64 case SBI_EXT_0_1_SHUTDOWN:
65 kvm_riscv_vcpu_sbi_system_reset(vcpu, run,
66 KVM_SYSTEM_EVENT_SHUTDOWN, 0);
67 retdata->uexit = true;
68 break;
69 case SBI_EXT_0_1_REMOTE_FENCE_I:
70 case SBI_EXT_0_1_REMOTE_SFENCE_VMA:
71 case SBI_EXT_0_1_REMOTE_SFENCE_VMA_ASID:
72 if (cp->a0)
73 hmask = kvm_riscv_vcpu_unpriv_read(vcpu, false, cp->a0, utrap);
74 else
75 hmask = (1UL << atomic_read(&kvm->online_vcpus)) - 1;
76 if (utrap->scause)
77 break;
78
79 if (cp->a7 == SBI_EXT_0_1_REMOTE_FENCE_I)
80 kvm_riscv_fence_i(vcpu->kvm, 0, hmask);
81 else if (cp->a7 == SBI_EXT_0_1_REMOTE_SFENCE_VMA) {
82 vmid = READ_ONCE(vcpu->kvm->arch.vmid.vmid);
83 if (cp->a1 == 0 && cp->a2 == 0)
84 kvm_riscv_hfence_vvma_all(vcpu->kvm, 0, hmask, vmid);
85 else
86 kvm_riscv_hfence_vvma_gva(vcpu->kvm, 0, hmask, cp->a1,
87 cp->a2, PAGE_SHIFT, vmid);
88 } else {
89 vmid = READ_ONCE(vcpu->kvm->arch.vmid.vmid);
90 if (cp->a1 == 0 && cp->a2 == 0)
91 kvm_riscv_hfence_vvma_asid_all(vcpu->kvm, 0, hmask,
92 cp->a3, vmid);
93 else
94 kvm_riscv_hfence_vvma_asid_gva(vcpu->kvm, 0, hmask,
95 cp->a1, cp->a2, PAGE_SHIFT,
96 cp->a3, vmid);
97 }
98 break;
99 default:
100 retdata->err_val = SBI_ERR_NOT_SUPPORTED;
101 break;
102 }
103
104 return ret;
105 }
106
107 const struct kvm_vcpu_sbi_extension vcpu_sbi_ext_v01 = {
108 .extid_start = SBI_EXT_0_1_SET_TIMER,
109 .extid_end = SBI_EXT_0_1_SHUTDOWN,
110 .handler = kvm_sbi_ext_v01_handler,
111 };
112