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 "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 void hyperv_x86_synic_reset(X86CPU *cpu)
  27 {
  28     hyperv_synic_reset(CPU(cpu));
  29 }
  30
  31 void hyperv_x86_synic_update(X86CPU *cpu)
  32 {
  33     CPUX86State *env = &cpu->env;
  34     bool enable = env->msr_hv_synic_control & HV_SYNIC_ENABLE;
  35     hwaddr msg_page_addr = (env->msr_hv_synic_msg_page & HV_SIMP_ENABLE) ?
  36         (env->msr_hv_synic_msg_page & TARGET_PAGE_MASK) : 0;
  37     hwaddr event_page_addr = (env->msr_hv_synic_evt_page & HV_SIEFP_ENABLE) ?
  38         (env->msr_hv_synic_evt_page & TARGET_PAGE_MASK) : 0;
  39     hyperv_synic_update(CPU(cpu), enable, msg_page_addr, event_page_addr);
  40 }
  41
  42 static void async_synic_update(CPUState *cs, run_on_cpu_data data)
  43 {
  44     qemu_mutex_lock_iothread();
  45     hyperv_x86_synic_update(X86_CPU(cs));
  46     qemu_mutex_unlock_iothread();
  47 }
  48
  49 int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
  50 {
  51     CPUX86State *env = &cpu->env;
  52
  53     switch (exit->type) {
  54     case KVM_EXIT_HYPERV_SYNIC:
  55         if (!cpu->hyperv_synic) {
  56             return -1;
  57         }
  58
  59         switch (exit->u.synic.msr) {
  60         case HV_X64_MSR_SCONTROL:
  61             env->msr_hv_synic_control = exit->u.synic.control;
  62             break;
  63         case HV_X64_MSR_SIMP:
  64             env->msr_hv_synic_msg_page = exit->u.synic.msg_page;
  65             break;
  66         case HV_X64_MSR_SIEFP:
  67             env->msr_hv_synic_evt_page = exit->u.synic.evt_page;
  68             break;
  69         default:
  70             return -1;
  71         }
  72
  73         /*
  74          * this will run in this cpu thread before it returns to KVM, but in a
  75          * safe environment (i.e. when all cpus are quiescent) -- this is
  76          * necessary because memory hierarchy is being changed
  77          */
  78         async_safe_run_on_cpu(CPU(cpu), async_synic_update, RUN_ON_CPU_NULL);
  79
  80         return 0;
  81     case KVM_EXIT_HYPERV_HCALL: {
  82         uint16_t code = exit->u.hcall.input & 0xffff;
  83         bool fast = exit->u.hcall.input & HV_HYPERCALL_FAST;
  84         uint64_t param = exit->u.hcall.params[0];
  85
  86         switch (code) {
  87         case HV_POST_MESSAGE:
  88             exit->u.hcall.result = hyperv_hcall_post_message(param, fast);
  89             break;
  90         case HV_SIGNAL_EVENT:
  91             exit->u.hcall.result = hyperv_hcall_signal_event(param, fast);
  92             break;
  93         default:
  94             exit->u.hcall.result = HV_STATUS_INVALID_HYPERCALL_CODE;
  95         }
  96         return 0;
  97     }
  98     default:
  99         return -1;
 100     }
 101 }