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     default:
  48         return -1;
  49     }
  50 }
  51
  52 static void kvm_hv_sint_ack_handler(EventNotifier *notifier)
  53 {
  54     HvSintRoute *sint_route = container_of(notifier, HvSintRoute,
  55                                            sint_ack_notifier);
  56     event_notifier_test_and_clear(notifier);
  57     if (sint_route->sint_ack_clb) {
  58         sint_route->sint_ack_clb(sint_route);
  59     }
  60 }
  61
  62 HvSintRoute *kvm_hv_sint_route_create(uint32_t vcpu_id, uint32_t sint,
  63                                       HvSintAckClb sint_ack_clb)
  64 {
  65     HvSintRoute *sint_route;
  66     int r, gsi;
  67
  68     sint_route = g_malloc0(sizeof(*sint_route));
  69     r = event_notifier_init(&sint_route->sint_set_notifier, false);
  70     if (r) {
  71         goto err;
  72     }
  73
  74     r = event_notifier_init(&sint_route->sint_ack_notifier, false);
  75     if (r) {
  76         goto err_sint_set_notifier;
  77     }
  78
  79     event_notifier_set_handler(&sint_route->sint_ack_notifier,
  80                                kvm_hv_sint_ack_handler);
  81
  82     gsi = kvm_irqchip_add_hv_sint_route(kvm_state, vcpu_id, sint);
  83     if (gsi < 0) {
  84         goto err_gsi;
  85     }
  86
  87     r = kvm_irqchip_add_irqfd_notifier_gsi(kvm_state,
  88                                            &sint_route->sint_set_notifier,
  89                                            &sint_route->sint_ack_notifier, gsi);
  90     if (r) {
  91         goto err_irqfd;
  92     }
  93     sint_route->gsi = gsi;
  94     sint_route->sint_ack_clb = sint_ack_clb;
  95     sint_route->vcpu_id = vcpu_id;
  96     sint_route->sint = sint;
  97
  98     return sint_route;
  99
 100 err_irqfd:
 101     kvm_irqchip_release_virq(kvm_state, gsi);
 102 err_gsi:
 103     event_notifier_set_handler(&sint_route->sint_ack_notifier, NULL);
 104     event_notifier_cleanup(&sint_route->sint_ack_notifier);
 105 err_sint_set_notifier:
 106     event_notifier_cleanup(&sint_route->sint_set_notifier);
 107 err:
 108     g_free(sint_route);
 109
 110     return NULL;
 111 }
 112
 113 void kvm_hv_sint_route_destroy(HvSintRoute *sint_route)
 114 {
 115     kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state,
 116                                           &sint_route->sint_set_notifier,
 117                                           sint_route->gsi);
 118     kvm_irqchip_release_virq(kvm_state, sint_route->gsi);
 119     event_notifier_set_handler(&sint_route->sint_ack_notifier, NULL);
 120     event_notifier_cleanup(&sint_route->sint_ack_notifier);
 121     event_notifier_cleanup(&sint_route->sint_set_notifier);
 122     g_free(sint_route);
 123 }
 124
 125 int kvm_hv_sint_route_set_sint(HvSintRoute *sint_route)
 126 {
 127     return event_notifier_set(&sint_route->sint_set_notifier);
 128 }