vmm_host.c revision 267427
1242275Sneel/*- 2242275Sneel * Copyright (c) 2012 NetApp, Inc. 3242275Sneel * All rights reserved. 4242275Sneel * 5242275Sneel * Redistribution and use in source and binary forms, with or without 6242275Sneel * modification, are permitted provided that the following conditions 7242275Sneel * are met: 8242275Sneel * 1. Redistributions of source code must retain the above copyright 9242275Sneel * notice, this list of conditions and the following disclaimer. 10242275Sneel * 2. Redistributions in binary form must reproduce the above copyright 11242275Sneel * notice, this list of conditions and the following disclaimer in the 12242275Sneel * documentation and/or other materials provided with the distribution. 13242275Sneel * 14242275Sneel * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15242275Sneel * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16242275Sneel * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17242275Sneel * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18242275Sneel * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19242275Sneel * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20242275Sneel * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21242275Sneel * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22242275Sneel * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23242275Sneel * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24242275Sneel * SUCH DAMAGE. 25242275Sneel * 26242275Sneel * $FreeBSD: stable/10/sys/amd64/vmm/vmm_host.c 267427 2014-06-12 19:58:12Z jhb $ 27242275Sneel */ 28242275Sneel 29242275Sneel#include <sys/cdefs.h> 30242275Sneel__FBSDID("$FreeBSD: stable/10/sys/amd64/vmm/vmm_host.c 267427 2014-06-12 19:58:12Z jhb $"); 31242275Sneel 32242275Sneel#include <sys/param.h> 33242275Sneel#include <sys/pcpu.h> 34242275Sneel 35242275Sneel#include <machine/cpufunc.h> 36242275Sneel#include <machine/segments.h> 37242275Sneel#include <machine/specialreg.h> 38242275Sneel 39242275Sneel#include "vmm_host.h" 40242275Sneel 41267427Sjhbstatic uint64_t vmm_host_efer, vmm_host_pat, vmm_host_cr0, vmm_host_cr4, 42267427Sjhb vmm_host_xcr0; 43267427Sjhbstatic struct xsave_limits vmm_xsave_limits; 44242275Sneel 45242275Sneelvoid 46242275Sneelvmm_host_state_init(void) 47242275Sneel{ 48267427Sjhb int regs[4]; 49242275Sneel 50242275Sneel vmm_host_efer = rdmsr(MSR_EFER); 51242275Sneel vmm_host_pat = rdmsr(MSR_PAT); 52242275Sneel 53242275Sneel /* 54242275Sneel * We always want CR0.TS to be set when the processor does a VM exit. 55242275Sneel * 56242275Sneel * With emulation turned on unconditionally after a VM exit, we are 57242275Sneel * able to trap inadvertent use of the FPU until the guest FPU state 58242275Sneel * has been safely squirreled away. 59242275Sneel */ 60242275Sneel vmm_host_cr0 = rcr0() | CR0_TS; 61242275Sneel 62242275Sneel vmm_host_cr4 = rcr4(); 63267427Sjhb 64267427Sjhb /* 65267427Sjhb * Only permit a guest to use XSAVE if the host is using 66267427Sjhb * XSAVE. Only permit a guest to use XSAVE features supported 67267427Sjhb * by the host. This ensures that the FPU state used by the 68267427Sjhb * guest is always a subset of the saved guest FPU state. 69267427Sjhb * 70267427Sjhb * In addition, only permit known XSAVE features where the 71267427Sjhb * rules for which features depend on other features is known 72267427Sjhb * to properly emulate xsetbv. 73267427Sjhb */ 74267427Sjhb if (vmm_host_cr4 & CR4_XSAVE) { 75267427Sjhb vmm_xsave_limits.xsave_enabled = 1; 76267427Sjhb vmm_host_xcr0 = rxcr(0); 77267427Sjhb vmm_xsave_limits.xcr0_allowed = vmm_host_xcr0 & 78267427Sjhb (XFEATURE_AVX | XFEATURE_MPX | XFEATURE_AVX512); 79267427Sjhb 80267427Sjhb cpuid_count(0xd, 0x0, regs); 81267427Sjhb vmm_xsave_limits.xsave_max_size = regs[1]; 82267427Sjhb } 83242275Sneel} 84242275Sneel 85242275Sneeluint64_t 86242275Sneelvmm_get_host_pat(void) 87242275Sneel{ 88242275Sneel 89242275Sneel return (vmm_host_pat); 90242275Sneel} 91242275Sneel 92242275Sneeluint64_t 93242275Sneelvmm_get_host_efer(void) 94242275Sneel{ 95242275Sneel 96242275Sneel return (vmm_host_efer); 97242275Sneel} 98242275Sneel 99242275Sneeluint64_t 100242275Sneelvmm_get_host_cr0(void) 101242275Sneel{ 102242275Sneel 103242275Sneel return (vmm_host_cr0); 104242275Sneel} 105242275Sneel 106242275Sneeluint64_t 107242275Sneelvmm_get_host_cr4(void) 108242275Sneel{ 109242275Sneel 110242275Sneel return (vmm_host_cr4); 111242275Sneel} 112242275Sneel 113242275Sneeluint64_t 114267427Sjhbvmm_get_host_xcr0(void) 115267427Sjhb{ 116267427Sjhb 117267427Sjhb return (vmm_host_xcr0); 118267427Sjhb} 119267427Sjhb 120267427Sjhbuint64_t 121242275Sneelvmm_get_host_datasel(void) 122242275Sneel{ 123242275Sneel 124242275Sneel return (GSEL(GDATA_SEL, SEL_KPL)); 125242275Sneel 126242275Sneel} 127242275Sneel 128242275Sneeluint64_t 129242275Sneelvmm_get_host_codesel(void) 130242275Sneel{ 131242275Sneel 132242275Sneel return (GSEL(GCODE_SEL, SEL_KPL)); 133242275Sneel} 134242275Sneel 135242275Sneeluint64_t 136242275Sneelvmm_get_host_tsssel(void) 137242275Sneel{ 138242275Sneel 139242275Sneel return (GSEL(GPROC0_SEL, SEL_KPL)); 140242275Sneel} 141242275Sneel 142242275Sneeluint64_t 143242275Sneelvmm_get_host_fsbase(void) 144242275Sneel{ 145242275Sneel 146242275Sneel return (0); 147242275Sneel} 148242275Sneel 149242275Sneeluint64_t 150242275Sneelvmm_get_host_idtrbase(void) 151242275Sneel{ 152242275Sneel 153242275Sneel return (r_idt.rd_base); 154242275Sneel} 155267427Sjhb 156267427Sjhbconst struct xsave_limits * 157267427Sjhbvmm_get_xsave_limits(void) 158267427Sjhb{ 159267427Sjhb 160267427Sjhb return (&vmm_xsave_limits); 161267427Sjhb} 162