vmsvga: don't process more than 1024 fifo commands at once
[qemu.git] / target-i386 / hyperv.c
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 "hyperv.h"
16 #include "standard-headers/asm-x86/hyperv.h"
17
18 int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
19 {
20 CPUX86State *env = &cpu->env;
21
22 switch (exit->type) {
23 case KVM_EXIT_HYPERV_SYNIC:
24 if (!cpu->hyperv_synic) {
25 return -1;
26 }
27
28 /*
29 * For now just track changes in SynIC control and msg/evt pages msr's.
30 * When SynIC messaging/events processing will be added in future
31 * here we will do messages queues flushing and pages remapping.
32 */
33 switch (exit->u.synic.msr) {
34 case HV_X64_MSR_SCONTROL:
35 env->msr_hv_synic_control = exit->u.synic.control;
36 break;
37 case HV_X64_MSR_SIMP:
38 env->msr_hv_synic_msg_page = exit->u.synic.msg_page;
39 break;
40 case HV_X64_MSR_SIEFP:
41 env->msr_hv_synic_evt_page = exit->u.synic.evt_page;
42 break;
43 default:
44 return -1;
45 }
46 return 0;
47 case KVM_EXIT_HYPERV_HCALL: {
48 uint16_t code;
49
50 code = exit->u.hcall.input & 0xffff;
51 switch (code) {
52 case HVCALL_POST_MESSAGE:
53 case HVCALL_SIGNAL_EVENT:
54 default:
55 exit->u.hcall.result = HV_STATUS_INVALID_HYPERCALL_CODE;
56 return 0;
57 }
58 }
59 default:
60 return -1;
61 }
62 }
63
64 static void kvm_hv_sint_ack_handler(EventNotifier *notifier)
65 {
66 HvSintRoute *sint_route = container_of(notifier, HvSintRoute,
67 sint_ack_notifier);
68 event_notifier_test_and_clear(notifier);
69 if (sint_route->sint_ack_clb) {
70 sint_route->sint_ack_clb(sint_route);
71 }
72 }
73
74 HvSintRoute *kvm_hv_sint_route_create(uint32_t vcpu_id, uint32_t sint,
75 HvSintAckClb sint_ack_clb)
76 {
77 HvSintRoute *sint_route;
78 int r, gsi;
79
80 sint_route = g_malloc0(sizeof(*sint_route));
81 r = event_notifier_init(&sint_route->sint_set_notifier, false);
82 if (r) {
83 goto err;
84 }
85
86 r = event_notifier_init(&sint_route->sint_ack_notifier, false);
87 if (r) {
88 goto err_sint_set_notifier;
89 }
90
91 event_notifier_set_handler(&sint_route->sint_ack_notifier, false,
92 kvm_hv_sint_ack_handler);
93
94 gsi = kvm_irqchip_add_hv_sint_route(kvm_state, vcpu_id, sint);
95 if (gsi < 0) {
96 goto err_gsi;
97 }
98
99 r = kvm_irqchip_add_irqfd_notifier_gsi(kvm_state,
100 &sint_route->sint_set_notifier,
101 &sint_route->sint_ack_notifier, gsi);
102 if (r) {
103 goto err_irqfd;
104 }
105 sint_route->gsi = gsi;
106 sint_route->sint_ack_clb = sint_ack_clb;
107 sint_route->vcpu_id = vcpu_id;
108 sint_route->sint = sint;
109
110 return sint_route;
111
112 err_irqfd:
113 kvm_irqchip_release_virq(kvm_state, gsi);
114 err_gsi:
115 event_notifier_set_handler(&sint_route->sint_ack_notifier, false, NULL);
116 event_notifier_cleanup(&sint_route->sint_ack_notifier);
117 err_sint_set_notifier:
118 event_notifier_cleanup(&sint_route->sint_set_notifier);
119 err:
120 g_free(sint_route);
121
122 return NULL;
123 }
124
125 void kvm_hv_sint_route_destroy(HvSintRoute *sint_route)
126 {
127 kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state,
128 &sint_route->sint_set_notifier,
129 sint_route->gsi);
130 kvm_irqchip_release_virq(kvm_state, sint_route->gsi);
131 event_notifier_set_handler(&sint_route->sint_ack_notifier, false, NULL);
132 event_notifier_cleanup(&sint_route->sint_ack_notifier);
133 event_notifier_cleanup(&sint_route->sint_set_notifier);
134 g_free(sint_route);
135 }
136
137 int kvm_hv_sint_route_set_sint(HvSintRoute *sint_route)
138 {
139 return event_notifier_set(&sint_route->sint_set_notifier);
140 }