1/*- 2 * Copyright (c) 2012 NetApp, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/11/sys/amd64/vmm/vmm_host.c 333167 2018-05-02 08:24:59Z kib $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: stable/11/sys/amd64/vmm/vmm_host.c 333167 2018-05-02 08:24:59Z kib $"); 31 32#include <sys/param.h> 33#include <sys/pcpu.h> 34 35#include <machine/cpufunc.h> 36#include <machine/segments.h> 37#include <machine/specialreg.h> 38 39#include "vmm_host.h" 40 41static uint64_t vmm_host_efer, vmm_host_pat, vmm_host_cr0, vmm_host_cr4, 42 vmm_host_xcr0; 43static struct xsave_limits vmm_xsave_limits; 44 45void 46vmm_host_state_init(void) 47{ 48 int regs[4]; 49 50 vmm_host_efer = rdmsr(MSR_EFER); 51 vmm_host_pat = rdmsr(MSR_PAT); 52 53 /* 54 * We always want CR0.TS to be set when the processor does a VM exit. 55 * 56 * With emulation turned on unconditionally after a VM exit, we are 57 * able to trap inadvertent use of the FPU until the guest FPU state 58 * has been safely squirreled away. 59 */ 60 vmm_host_cr0 = rcr0() | CR0_TS; 61 62 /* 63 * On non-PCID or PCID but without INVPCID support machines, 64 * we flush kernel i.e. global TLB entries, by temporary 65 * clearing the CR4.PGE bit, see invltlb_glob(). If 66 * preemption occurs at the wrong time, cached vmm_host_cr4 67 * might store the value with CR4.PGE cleared. Since FreeBSD 68 * requires support for PG_G on amd64, just set it 69 * unconditionally. 70 */ 71 vmm_host_cr4 = rcr4() | CR4_PGE; 72 73 /* 74 * Only permit a guest to use XSAVE if the host is using 75 * XSAVE. Only permit a guest to use XSAVE features supported 76 * by the host. This ensures that the FPU state used by the 77 * guest is always a subset of the saved guest FPU state. 78 * 79 * In addition, only permit known XSAVE features where the 80 * rules for which features depend on other features is known 81 * to properly emulate xsetbv. 82 */ 83 if (vmm_host_cr4 & CR4_XSAVE) { 84 vmm_xsave_limits.xsave_enabled = 1; 85 vmm_host_xcr0 = rxcr(0); 86 vmm_xsave_limits.xcr0_allowed = vmm_host_xcr0 & 87 (XFEATURE_AVX | XFEATURE_MPX | XFEATURE_AVX512); 88 89 cpuid_count(0xd, 0x0, regs); 90 vmm_xsave_limits.xsave_max_size = regs[1]; 91 } 92} 93 94uint64_t 95vmm_get_host_pat(void) 96{ 97 98 return (vmm_host_pat); 99} 100 101uint64_t 102vmm_get_host_efer(void) 103{ 104 105 return (vmm_host_efer); 106} 107 108uint64_t 109vmm_get_host_cr0(void) 110{ 111 112 return (vmm_host_cr0); 113} 114 115uint64_t 116vmm_get_host_cr4(void) 117{ 118 119 return (vmm_host_cr4); 120} 121 122uint64_t 123vmm_get_host_xcr0(void) 124{ 125 126 return (vmm_host_xcr0); 127} 128 129uint64_t 130vmm_get_host_datasel(void) 131{ 132 133 return (GSEL(GDATA_SEL, SEL_KPL)); 134 135} 136 137uint64_t 138vmm_get_host_codesel(void) 139{ 140 141 return (GSEL(GCODE_SEL, SEL_KPL)); 142} 143 144uint64_t 145vmm_get_host_tsssel(void) 146{ 147 148 return (GSEL(GPROC0_SEL, SEL_KPL)); 149} 150 151uint64_t 152vmm_get_host_fsbase(void) 153{ 154 155 return (0); 156} 157 158uint64_t 159vmm_get_host_idtrbase(void) 160{ 161 162 return (r_idt.rd_base); 163} 164 165const struct xsave_limits * 166vmm_get_xsave_limits(void) 167{ 168 169 return (&vmm_xsave_limits); 170} 171