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1 /*
2 * QEMU KVM Hyper-V support
3 *
4 * Copyright (C) 2015 Andrey Smetanin <asmetanin@virtuozzo.com>
5 *
6 * Authors:
7 * Andrey Smetanin <asmetanin@virtuozzo.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
11 *
12 */
13
14 #include "qemu/osdep.h"
15 #include "qemu/main-loop.h"
16 #include "exec/target_page.h"
17 #include "hyperv.h"
18 #include "hw/hyperv/hyperv.h"
19 #include "hyperv-proto.h"
20
21 int hyperv_x86_synic_add(X86CPU *cpu)
22 {
23 hyperv_synic_add(CPU(cpu));
24 return 0;
25 }
26
27 int hyperv_enable_synic(X86CPU *cpu)
28 {
29 int ret = 0;
30 if (!hyperv_is_synic_present(CPU(cpu))) {
31 ret = hyperv_x86_synic_add(cpu);
32 }
33 return ret;
34 }
35
36 /*
37 * All devices possibly using SynIC have to be reset before calling this to let
38 * them remove their SINT routes first.
39 */
40 void hyperv_x86_synic_reset(X86CPU *cpu)
41 {
42 hyperv_synic_reset(CPU(cpu));
43 }
44
45 void hyperv_x86_synic_update(X86CPU *cpu)
46 {
47 CPUX86State *env = &cpu->env;
48 bool enable = env->msr_hv_synic_control & HV_SYNIC_ENABLE;
49 hwaddr msg_page_addr = (env->msr_hv_synic_msg_page & HV_SIMP_ENABLE) ?
50 (env->msr_hv_synic_msg_page & TARGET_PAGE_MASK) : 0;
51 hwaddr event_page_addr = (env->msr_hv_synic_evt_page & HV_SIEFP_ENABLE) ?
52 (env->msr_hv_synic_evt_page & TARGET_PAGE_MASK) : 0;
53 hyperv_synic_update(CPU(cpu), enable, msg_page_addr, event_page_addr);
54 }
55
56 static void async_synic_update(CPUState *cs, run_on_cpu_data data)
57 {
58 bql_lock();
59 hyperv_x86_synic_update(X86_CPU(cs));
60 bql_unlock();
61 }
62
63 int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
64 {
65 CPUX86State *env = &cpu->env;
66
67 switch (exit->type) {
68 case KVM_EXIT_HYPERV_SYNIC:
69 if (!hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNIC)) {
70 return -1;
71 }
72
73 switch (exit->u.synic.msr) {
74 case HV_X64_MSR_SCONTROL:
75 env->msr_hv_synic_control = exit->u.synic.control;
76 break;
77 case HV_X64_MSR_SIMP:
78 env->msr_hv_synic_msg_page = exit->u.synic.msg_page;
79 break;
80 case HV_X64_MSR_SIEFP:
81 env->msr_hv_synic_evt_page = exit->u.synic.evt_page;
82 break;
83 default:
84 return -1;
85 }
86
87 /*
88 * this will run in this cpu thread before it returns to KVM, but in a
89 * safe environment (i.e. when all cpus are quiescent) -- this is
90 * necessary because memory hierarchy is being changed
91 */
92 async_safe_run_on_cpu(CPU(cpu), async_synic_update, RUN_ON_CPU_NULL);
93
94 return EXCP_INTERRUPT;
95 case KVM_EXIT_HYPERV_HCALL: {
96 uint16_t code = exit->u.hcall.input & 0xffff;
97 bool fast = exit->u.hcall.input & HV_HYPERCALL_FAST;
98 uint64_t in_param = exit->u.hcall.params[0];
99 uint64_t out_param = exit->u.hcall.params[1];
100
101 switch (code) {
102 case HV_POST_MESSAGE:
103 exit->u.hcall.result = hyperv_hcall_post_message(in_param, fast);
104 break;
105 case HV_SIGNAL_EVENT:
106 exit->u.hcall.result = hyperv_hcall_signal_event(in_param, fast);
107 break;
108 case HV_POST_DEBUG_DATA:
109 exit->u.hcall.result =
110 hyperv_hcall_post_dbg_data(in_param, out_param, fast);
111 break;
112 case HV_RETRIEVE_DEBUG_DATA:
113 exit->u.hcall.result =
114 hyperv_hcall_retreive_dbg_data(in_param, out_param, fast);
115 break;
116 case HV_RESET_DEBUG_SESSION:
117 exit->u.hcall.result =
118 hyperv_hcall_reset_dbg_session(out_param);
119 break;
120 default:
121 exit->u.hcall.result = HV_STATUS_INVALID_HYPERCALL_CODE;
122 }
123 return 0;
124 }
125
126 case KVM_EXIT_HYPERV_SYNDBG:
127 if (!hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNDBG)) {
128 return -1;
129 }
130
131 switch (exit->u.syndbg.msr) {
132 case HV_X64_MSR_SYNDBG_CONTROL: {
133 uint64_t control = exit->u.syndbg.control;
134 env->msr_hv_syndbg_control = control;
135 env->msr_hv_syndbg_send_page = exit->u.syndbg.send_page;
136 env->msr_hv_syndbg_recv_page = exit->u.syndbg.recv_page;
137 exit->u.syndbg.status = HV_STATUS_SUCCESS;
138 if (control & HV_SYNDBG_CONTROL_SEND) {
139 exit->u.syndbg.status =
140 hyperv_syndbg_send(env->msr_hv_syndbg_send_page,
141 HV_SYNDBG_CONTROL_SEND_SIZE(control));
142 } else if (control & HV_SYNDBG_CONTROL_RECV) {
143 exit->u.syndbg.status =
144 hyperv_syndbg_recv(env->msr_hv_syndbg_recv_page,
145 TARGET_PAGE_SIZE);
146 }
147 break;
148 }
149 case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
150 env->msr_hv_syndbg_pending_page = exit->u.syndbg.pending_page;
151 hyperv_syndbg_set_pending_page(env->msr_hv_syndbg_pending_page);
152 break;
153 default:
154 return -1;
155 }
156
157 return 0;
158 default:
159 return -1;
160 }
161 }
162
163 void hyperv_x86_set_vmbus_recommended_features_enabled(void)
164 {
165 hyperv_set_vmbus_recommended_features_enabled();
166 }