1 /*- SPDX-License-Identifier: BSD-2-Clause 2 * Copyright (c) 2009-2012,2016-2017, 2022 Microsoft Corp. 3 * Copyright (c) 2012 NetApp Inc. 4 * Copyright (c) 2012 Citrix Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /** 30 * Implements low-level interactions with Hyper-V/Azure 31 */ 32 33 #include <sys/cdefs.h> 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/timetc.h> 39 40 #include <vm/vm.h> 41 #include <vm/pmap.h> 42 #include <vm/vm_extern.h> 43 #include <vm/vm_kern.h> 44 45 #include <dev/hyperv/include/hyperv.h> 46 #include <dev/hyperv/include/hyperv_busdma.h> 47 #include <dev/hyperv/vmbus/aarch64/hyperv_machdep.h> 48 #include <dev/hyperv/vmbus/aarch64/hyperv_reg.h> 49 #include <dev/hyperv/vmbus/hyperv_var.h> 50 #include <dev/hyperv/vmbus/hyperv_common_reg.h> 51 #include <contrib/dev/acpica/include/acpi.h> 52 53 void hyperv_init_tc(void); 54 int hypercall_page_setup(vm_paddr_t); 55 void hypercall_disable(void); 56 bool hyperv_identify_features(void); 57 58 static bool is_hyperv(void); 59 60 u_int hyperv_ver_major; 61 u_int hyperv_features; 62 u_int hyperv_recommends; 63 64 hyperv_tc64_t hyperv_tc64; 65 66 void 67 hyperv_init_tc(void) 68 { 69 hyperv_tc64 = NULL; 70 } 71 72 int 73 hypercall_page_setup(vm_paddr_t hc) 74 { 75 return (0); 76 } 77 78 void 79 hypercall_disable(void) 80 { 81 return; 82 } 83 84 /* 85 * This function verifies if the platform is Hyper-V or not. 86 * To do that we are using ACPI FADT and for that, acpi 87 * fadt is mapped first. 88 */ 89 static bool 90 is_hyperv(void) 91 { 92 ACPI_TABLE_FADT *fadt; 93 vm_paddr_t physaddr; 94 uint64_t hypervid; 95 bool ret; 96 97 physaddr = acpi_find_table(ACPI_SIG_FADT); 98 if (physaddr == 0) 99 return (false); 100 101 fadt = acpi_map_table(physaddr, ACPI_SIG_FADT); 102 if (fadt == NULL) { 103 printf("hyperv: Unable to map the FADT\n"); 104 return (false); 105 } 106 107 hypervid = fadt->HypervisorId; 108 acpi_unmap_table(fadt); 109 ret = strncmp((char *)&hypervid, "MsHyperV", 8) == 0 ? true : false; 110 return (ret); 111 } 112 113 bool 114 hyperv_identify_features(void) 115 { 116 struct hv_get_vp_registers_output result; 117 118 if (resource_disabled("acpi", 0)) 119 return (false); 120 if (!is_hyperv()) 121 return (false); 122 123 vm_guest = VM_GUEST_HV; 124 /* use MSRs to get the hyperv specific 125 * attributes. 126 */ 127 hv_get_vpreg_128(CPUID_LEAF_HV_FEATURES, &result); 128 hyperv_features = result.as32.a; 129 hv_get_vpreg_128(CPUID_LEAF_HV_IDENTITY, &result); 130 hyperv_ver_major = result.as32.b >> 16; 131 hv_get_vpreg_128(CPUID_LEAF_HV_RECOMMENDS, &result); 132 hyperv_recommends = result.as32.a; 133 return (true); 134 } 135