xref: /openbmc/qemu/target/i386/kvm/hyperv.c (revision f0984d40)
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 "hyperv.h"
17 #include "hw/hyperv/hyperv.h"
18 #include "hyperv-proto.h"
19 
20 int hyperv_x86_synic_add(X86CPU *cpu)
21 {
22     hyperv_synic_add(CPU(cpu));
23     return 0;
24 }
25 
26 /*
27  * All devices possibly using SynIC have to be reset before calling this to let
28  * them remove their SINT routes first.
29  */
30 void hyperv_x86_synic_reset(X86CPU *cpu)
31 {
32     hyperv_synic_reset(CPU(cpu));
33 }
34 
35 void hyperv_x86_synic_update(X86CPU *cpu)
36 {
37     CPUX86State *env = &cpu->env;
38     bool enable = env->msr_hv_synic_control & HV_SYNIC_ENABLE;
39     hwaddr msg_page_addr = (env->msr_hv_synic_msg_page & HV_SIMP_ENABLE) ?
40         (env->msr_hv_synic_msg_page & TARGET_PAGE_MASK) : 0;
41     hwaddr event_page_addr = (env->msr_hv_synic_evt_page & HV_SIEFP_ENABLE) ?
42         (env->msr_hv_synic_evt_page & TARGET_PAGE_MASK) : 0;
43     hyperv_synic_update(CPU(cpu), enable, msg_page_addr, event_page_addr);
44 }
45 
46 static void async_synic_update(CPUState *cs, run_on_cpu_data data)
47 {
48     qemu_mutex_lock_iothread();
49     hyperv_x86_synic_update(X86_CPU(cs));
50     qemu_mutex_unlock_iothread();
51 }
52 
53 int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
54 {
55     CPUX86State *env = &cpu->env;
56 
57     switch (exit->type) {
58     case KVM_EXIT_HYPERV_SYNIC:
59         if (!hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNIC)) {
60             return -1;
61         }
62 
63         switch (exit->u.synic.msr) {
64         case HV_X64_MSR_SCONTROL:
65             env->msr_hv_synic_control = exit->u.synic.control;
66             break;
67         case HV_X64_MSR_SIMP:
68             env->msr_hv_synic_msg_page = exit->u.synic.msg_page;
69             break;
70         case HV_X64_MSR_SIEFP:
71             env->msr_hv_synic_evt_page = exit->u.synic.evt_page;
72             break;
73         default:
74             return -1;
75         }
76 
77         /*
78          * this will run in this cpu thread before it returns to KVM, but in a
79          * safe environment (i.e. when all cpus are quiescent) -- this is
80          * necessary because memory hierarchy is being changed
81          */
82         async_safe_run_on_cpu(CPU(cpu), async_synic_update, RUN_ON_CPU_NULL);
83 
84         return 0;
85     case KVM_EXIT_HYPERV_HCALL: {
86         uint16_t code = exit->u.hcall.input & 0xffff;
87         bool fast = exit->u.hcall.input & HV_HYPERCALL_FAST;
88         uint64_t in_param = exit->u.hcall.params[0];
89         uint64_t out_param = exit->u.hcall.params[1];
90 
91         switch (code) {
92         case HV_POST_MESSAGE:
93             exit->u.hcall.result = hyperv_hcall_post_message(in_param, fast);
94             break;
95         case HV_SIGNAL_EVENT:
96             exit->u.hcall.result = hyperv_hcall_signal_event(in_param, fast);
97             break;
98         case HV_POST_DEBUG_DATA:
99             exit->u.hcall.result =
100                 hyperv_hcall_post_dbg_data(in_param, out_param, fast);
101             break;
102         case HV_RETRIEVE_DEBUG_DATA:
103             exit->u.hcall.result =
104                 hyperv_hcall_retreive_dbg_data(in_param, out_param, fast);
105             break;
106         case HV_RESET_DEBUG_SESSION:
107             exit->u.hcall.result =
108                 hyperv_hcall_reset_dbg_session(out_param);
109             break;
110         default:
111             exit->u.hcall.result = HV_STATUS_INVALID_HYPERCALL_CODE;
112         }
113         return 0;
114     }
115 
116     case KVM_EXIT_HYPERV_SYNDBG:
117         if (!hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNDBG)) {
118             return -1;
119         }
120 
121         switch (exit->u.syndbg.msr) {
122         case HV_X64_MSR_SYNDBG_CONTROL: {
123             uint64_t control = exit->u.syndbg.control;
124             env->msr_hv_syndbg_control = control;
125             env->msr_hv_syndbg_send_page = exit->u.syndbg.send_page;
126             env->msr_hv_syndbg_recv_page = exit->u.syndbg.recv_page;
127             exit->u.syndbg.status = HV_STATUS_SUCCESS;
128             if (control & HV_SYNDBG_CONTROL_SEND) {
129                 exit->u.syndbg.status =
130                     hyperv_syndbg_send(env->msr_hv_syndbg_send_page,
131                             HV_SYNDBG_CONTROL_SEND_SIZE(control));
132             } else if (control & HV_SYNDBG_CONTROL_RECV) {
133                 exit->u.syndbg.status =
134                     hyperv_syndbg_recv(env->msr_hv_syndbg_recv_page,
135                             TARGET_PAGE_SIZE);
136             }
137             break;
138         }
139         case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
140             env->msr_hv_syndbg_pending_page = exit->u.syndbg.pending_page;
141             hyperv_syndbg_set_pending_page(env->msr_hv_syndbg_pending_page);
142             break;
143         default:
144             return -1;
145         }
146 
147         return 0;
148     default:
149         return -1;
150     }
151 }
152