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,
  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, 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, 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 }