1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 NetApp, 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, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 /* 31 * This file and its contents are supplied under the terms of the 32 * Common Development and Distribution License ("CDDL"), version 1.0. 33 * You may only use this file in accordance with the terms of version 34 * 1.0 of the CDDL. 35 * 36 * A full copy of the text of the CDDL should have accompanied this 37 * source. A copy of the CDDL is also available via the Internet at 38 * http://www.illumos.org/license/CDDL. 39 * 40 * Copyright 2014 Pluribus Networks Inc. 41 * Copyright 2018 Joyent, Inc. 42 * Copyright 2020 Oxide Computer Company 43 */ 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <sys/param.h> 49 #include <sys/pcpu.h> 50 #include <sys/systm.h> 51 #include <sys/sysctl.h> 52 #include <sys/x86_archext.h> 53 54 #include <machine/clock.h> 55 #include <machine/cpufunc.h> 56 #include <machine/md_var.h> 57 #include <machine/segments.h> 58 #include <machine/specialreg.h> 59 60 #include <machine/vmm.h> 61 #include <sys/vmm_kernel.h> 62 63 #include "vmm_host.h" 64 #include "vmm_util.h" 65 66 /* 67 * Return 'true' if the capability 'cap' is enabled in this virtual cpu 68 * and 'false' otherwise. 69 */ 70 bool 71 vm_cpuid_capability(struct vm *vm, int vcpuid, enum vm_cpuid_capability cap) 72 { 73 bool rv; 74 75 KASSERT(cap > 0 && cap < VCC_LAST, ("%s: invalid vm_cpu_capability %d", 76 __func__, cap)); 77 78 /* 79 * Simply passthrough the capabilities of the host cpu for now. 80 */ 81 rv = false; 82 switch (cap) { 83 #ifdef __FreeBSD__ 84 case VCC_NO_EXECUTE: 85 if (amd_feature & AMDID_NX) 86 rv = true; 87 break; 88 case VCC_FFXSR: 89 if (amd_feature & AMDID_FFXSR) 90 rv = true; 91 break; 92 case VCC_TCE: 93 if (amd_feature2 & AMDID2_TCE) 94 rv = true; 95 break; 96 #else 97 case VCC_NO_EXECUTE: 98 if (is_x86_feature(x86_featureset, X86FSET_NX)) 99 rv = true; 100 break; 101 /* XXXJOY: No kernel detection for FFXR or TCE at present, so ignore */ 102 case VCC_FFXSR: 103 case VCC_TCE: 104 break; 105 #endif 106 default: 107 panic("%s: unknown vm_cpu_capability %d", __func__, cap); 108 } 109 return (rv); 110 } 111 112 bool 113 validate_guest_xcr0(uint64_t val, uint64_t limit_mask) 114 { 115 /* x87 feature must be enabled */ 116 if ((val & XFEATURE_ENABLED_X87) == 0) { 117 return (false); 118 } 119 /* AVX cannot be enabled without SSE */ 120 if ((val & (XFEATURE_ENABLED_SSE | XFEATURE_ENABLED_AVX)) == 121 XFEATURE_ENABLED_SSE) { 122 return (false); 123 } 124 /* No bits should be outside what we dictate to be allowed */ 125 if ((val & ~limit_mask) != 0) { 126 return (false); 127 } 128 129 return (true); 130 } 131