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 (!hyperv_feat_enabled(cpu, HYPERV_FEAT_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 } 102