target/i386/kvm/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 /*
  27  * All devices possibly using SynIC have to be reset before calling this to let
  28  * them remove their SINT routes first.
  29  */
  30 void hyperv_x86_synic_reset(X86CPU *cpu)
  31 {
  32     hyperv_synic_reset(CPU(cpu));
  33 }
  34
  35 void hyperv_x86_synic_update(X86CPU *cpu)
  36 {
  37     CPUX86State *env = &cpu->env;
  38     bool enable = env->msr_hv_synic_control & HV_SYNIC_ENABLE;
  39     hwaddr msg_page_addr = (env->msr_hv_synic_msg_page & HV_SIMP_ENABLE) ?
  40         (env->msr_hv_synic_msg_page & TARGET_PAGE_MASK) : 0;
  41     hwaddr event_page_addr = (env->msr_hv_synic_evt_page & HV_SIEFP_ENABLE) ?
  42         (env->msr_hv_synic_evt_page & TARGET_PAGE_MASK) : 0;
  43     hyperv_synic_update(CPU(cpu), enable, msg_page_addr, event_page_addr);
  44 }
  45
  46 static void async_synic_update(CPUState *cs, run_on_cpu_data data)
  47 {
  48     qemu_mutex_lock_iothread();
  49     hyperv_x86_synic_update(X86_CPU(cs));
  50     qemu_mutex_unlock_iothread();
  51 }
  52
  53 int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit)
  54 {
  55     CPUX86State *env = &cpu->env;
  56
  57     switch (exit->type) {
  58     case KVM_EXIT_HYPERV_SYNIC:
  59         if (!hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNIC)) {
  60             return -1;
  61         }
  62
  63         switch (exit->u.synic.msr) {
  64         case HV_X64_MSR_SCONTROL:
  65             env->msr_hv_synic_control = exit->u.synic.control;
  66             break;
  67         case HV_X64_MSR_SIMP:
  68             env->msr_hv_synic_msg_page = exit->u.synic.msg_page;
  69             break;
  70         case HV_X64_MSR_SIEFP:
  71             env->msr_hv_synic_evt_page = exit->u.synic.evt_page;
  72             break;
  73         default:
  74             return -1;
  75         }
  76
  77         /*
  78          * this will run in this cpu thread before it returns to KVM, but in a
  79          * safe environment (i.e. when all cpus are quiescent) -- this is
  80          * necessary because memory hierarchy is being changed
  81          */
  82         async_safe_run_on_cpu(CPU(cpu), async_synic_update, RUN_ON_CPU_NULL);
  83
  84         return 0;
  85     case KVM_EXIT_HYPERV_HCALL: {
  86         uint16_t code = exit->u.hcall.input & 0xffff;
  87         bool fast = exit->u.hcall.input & HV_HYPERCALL_FAST;
  88         uint64_t in_param = exit->u.hcall.params[0];
  89         uint64_t out_param = exit->u.hcall.params[1];
  90
  91         switch (code) {
  92         case HV_POST_MESSAGE:
  93             exit->u.hcall.result = hyperv_hcall_post_message(in_param, fast);
  94             break;
  95         case HV_SIGNAL_EVENT:
  96             exit->u.hcall.result = hyperv_hcall_signal_event(in_param, fast);
  97             break;
  98         case HV_POST_DEBUG_DATA:
  99             exit->u.hcall.result =
 100                 hyperv_hcall_post_dbg_data(in_param, out_param, fast);
 101             break;
 102         case HV_RETRIEVE_DEBUG_DATA:
 103             exit->u.hcall.result =
 104                 hyperv_hcall_retreive_dbg_data(in_param, out_param, fast);
 105             break;
 106         case HV_RESET_DEBUG_SESSION:
 107             exit->u.hcall.result =
 108                 hyperv_hcall_reset_dbg_session(out_param);
 109             break;
 110         default:
 111             exit->u.hcall.result = HV_STATUS_INVALID_HYPERCALL_CODE;
 112         }
 113         return 0;
 114     }
 115
 116     case KVM_EXIT_HYPERV_SYNDBG:
 117         if (!hyperv_feat_enabled(cpu, HYPERV_FEAT_SYNDBG)) {
 118             return -1;
 119         }
 120
 121         switch (exit->u.syndbg.msr) {
 122         case HV_X64_MSR_SYNDBG_CONTROL: {
 123             uint64_t control = exit->u.syndbg.control;
 124             env->msr_hv_syndbg_control = control;
 125             env->msr_hv_syndbg_send_page = exit->u.syndbg.send_page;
 126             env->msr_hv_syndbg_recv_page = exit->u.syndbg.recv_page;
 127             exit->u.syndbg.status = HV_STATUS_SUCCESS;
 128             if (control & HV_SYNDBG_CONTROL_SEND) {
 129                 exit->u.syndbg.status =
 130                     hyperv_syndbg_send(env->msr_hv_syndbg_send_page,
 131                             HV_SYNDBG_CONTROL_SEND_SIZE(control));
 132             } else if (control & HV_SYNDBG_CONTROL_RECV) {
 133                 exit->u.syndbg.status =
 134                     hyperv_syndbg_recv(env->msr_hv_syndbg_recv_page,
 135                             TARGET_PAGE_SIZE);
 136             }
 137             break;
 138         }
 139         case HV_X64_MSR_SYNDBG_PENDING_BUFFER:
 140             env->msr_hv_syndbg_pending_page = exit->u.syndbg.pending_page;
 141             hyperv_syndbg_set_pending_page(env->msr_hv_syndbg_pending_page);
 142             break;
 143         default:
 144             return -1;
 145         }
 146
 147         return 0;
 148     default:
 149         return -1;
 150     }
 151 }