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 "hyperv.h"
  15 #include "standard-headers/asm-x86/hyperv.h"
  16
  17 int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
  18 {
  19     CPUX86State *env = &cpu->env;
  20
  21     switch (exit->type) {
  22     case KVM_EXIT_HYPERV_SYNIC:
  23         if (!cpu->hyperv_synic) {
  24             return -1;
  25         }
  26
  27         /*
  28          * For now just track changes in SynIC control and msg/evt pages msr's.
  29          * When SynIC messaging/events processing will be added in future
  30          * here we will do messages queues flushing and pages remapping.
  31          */
  32         switch (exit->u.synic.msr) {
  33         case HV_X64_MSR_SCONTROL:
  34             env->msr_hv_synic_control = exit->u.synic.control;
  35             break;
  36         case HV_X64_MSR_SIMP:
  37             env->msr_hv_synic_msg_page = exit->u.synic.msg_page;
  38             break;
  39         case HV_X64_MSR_SIEFP:
  40             env->msr_hv_synic_evt_page = exit->u.synic.evt_page;
  41             break;
  42         default:
  43             return -1;
  44         }
  45         return 0;
  46     default:
  47         return -1;
  48     }
  49 }
  50
  51 static void kvm_hv_sint_ack_handler(EventNotifier *notifier)
  52 {
  53     HvSintRoute *sint_route = container_of(notifier, HvSintRoute,
  54                                            sint_ack_notifier);
  55     event_notifier_test_and_clear(notifier);
  56     if (sint_route->sint_ack_clb) {
  57         sint_route->sint_ack_clb(sint_route);
  58     }
  59 }
  60
  61 HvSintRoute *kvm_hv_sint_route_create(uint32_t vcpu_id, uint32_t sint,
  62                                       HvSintAckClb sint_ack_clb)
  63 {
  64     HvSintRoute *sint_route;
  65     int r, gsi;
  66
  67     sint_route = g_malloc0(sizeof(*sint_route));
  68     r = event_notifier_init(&sint_route->sint_set_notifier, false);
  69     if (r) {
  70         goto err;
  71     }
  72
  73     r = event_notifier_init(&sint_route->sint_ack_notifier, false);
  74     if (r) {
  75         goto err_sint_set_notifier;
  76     }
  77
  78     event_notifier_set_handler(&sint_route->sint_ack_notifier,
  79                                kvm_hv_sint_ack_handler);
  80
  81     gsi = kvm_irqchip_add_hv_sint_route(kvm_state, vcpu_id, sint);
  82     if (gsi < 0) {
  83         goto err_gsi;
  84     }
  85
  86     r = kvm_irqchip_add_irqfd_notifier_gsi(kvm_state,
  87                                            &sint_route->sint_set_notifier,
  88                                            &sint_route->sint_ack_notifier, gsi);
  89     if (r) {
  90         goto err_irqfd;
  91     }
  92     sint_route->gsi = gsi;
  93     sint_route->sint_ack_clb = sint_ack_clb;
  94     sint_route->vcpu_id = vcpu_id;
  95     sint_route->sint = sint;
  96
  97     return sint_route;
  98
  99 err_irqfd:
 100     kvm_irqchip_release_virq(kvm_state, gsi);
 101 err_gsi:
 102     event_notifier_set_handler(&sint_route->sint_ack_notifier, NULL);
 103     event_notifier_cleanup(&sint_route->sint_ack_notifier);
 104 err_sint_set_notifier:
 105     event_notifier_cleanup(&sint_route->sint_set_notifier);
 106 err:
 107     g_free(sint_route);
 108
 109     return NULL;
 110 }
 111
 112 void kvm_hv_sint_route_destroy(HvSintRoute *sint_route)
 113 {
 114     kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state,
 115                                           &sint_route->sint_set_notifier,
 116                                           sint_route->gsi);
 117     kvm_irqchip_release_virq(kvm_state, sint_route->gsi);
 118     event_notifier_set_handler(&sint_route->sint_ack_notifier, NULL);
 119     event_notifier_cleanup(&sint_route->sint_ack_notifier);
 120     event_notifier_cleanup(&sint_route->sint_set_notifier);
 121     g_free(sint_route);
 122 }
 123
 124 int kvm_hv_sint_route_set_sint(HvSintRoute *sint_route)
 125 {
 126     return event_notifier_set(&sint_route->sint_set_notifier);
 127 }