vmm_host.c revision 261638
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: head/sys/amd64/vmm/vmm_host.c 261638 2014-02-08 16:37:54Z jhb $ 27242275Sneel */ 28242275Sneel 29242275Sneel#include <sys/cdefs.h> 30242275Sneel__FBSDID("$FreeBSD: head/sys/amd64/vmm/vmm_host.c 261638 2014-02-08 16:37:54Z 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 41261638Sjhbstatic uint64_t vmm_host_efer, vmm_host_pat, vmm_host_cr0, vmm_host_cr4, 42261638Sjhb vmm_host_xcr0; 43261638Sjhbstatic struct xsave_limits vmm_xsave_limits; 44242275Sneel 45242275Sneelvoid 46242275Sneelvmm_host_state_init(void) 47242275Sneel{ 48261638Sjhb 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(); 63261638Sjhb 64261638Sjhb /* 65261638Sjhb * Only permit a guest to use XSAVE if the host is using 66261638Sjhb * XSAVE. Only permit a guest to use XSAVE features supported 67261638Sjhb * by the host. This ensures that the FPU state used by the 68261638Sjhb * guest is always a subset of the saved guest FPU state. 69261638Sjhb */ 70261638Sjhb if (vmm_host_cr4 & CR4_XSAVE) { 71261638Sjhb vmm_xsave_limits.xsave_enabled = 1; 72261638Sjhb vmm_host_xcr0 = rxcr(0); 73261638Sjhb vmm_xsave_limits.xcr0_allowed = vmm_host_xcr0; 74261638Sjhb 75261638Sjhb cpuid_count(0xd, 0x0, regs); 76261638Sjhb vmm_xsave_limits.xsave_max_size = regs[1]; 77261638Sjhb } 78242275Sneel} 79242275Sneel 80242275Sneeluint64_t 81242275Sneelvmm_get_host_pat(void) 82242275Sneel{ 83242275Sneel 84242275Sneel return (vmm_host_pat); 85242275Sneel} 86242275Sneel 87242275Sneeluint64_t 88242275Sneelvmm_get_host_efer(void) 89242275Sneel{ 90242275Sneel 91242275Sneel return (vmm_host_efer); 92242275Sneel} 93242275Sneel 94242275Sneeluint64_t 95242275Sneelvmm_get_host_cr0(void) 96242275Sneel{ 97242275Sneel 98242275Sneel return (vmm_host_cr0); 99242275Sneel} 100242275Sneel 101242275Sneeluint64_t 102242275Sneelvmm_get_host_cr4(void) 103242275Sneel{ 104242275Sneel 105242275Sneel return (vmm_host_cr4); 106242275Sneel} 107242275Sneel 108242275Sneeluint64_t 109261638Sjhbvmm_get_host_xcr0(void) 110261638Sjhb{ 111261638Sjhb 112261638Sjhb return (vmm_host_xcr0); 113261638Sjhb} 114261638Sjhb 115261638Sjhbuint64_t 116242275Sneelvmm_get_host_datasel(void) 117242275Sneel{ 118242275Sneel 119242275Sneel return (GSEL(GDATA_SEL, SEL_KPL)); 120242275Sneel 121242275Sneel} 122242275Sneel 123242275Sneeluint64_t 124242275Sneelvmm_get_host_codesel(void) 125242275Sneel{ 126242275Sneel 127242275Sneel return (GSEL(GCODE_SEL, SEL_KPL)); 128242275Sneel} 129242275Sneel 130242275Sneeluint64_t 131242275Sneelvmm_get_host_tsssel(void) 132242275Sneel{ 133242275Sneel 134242275Sneel return (GSEL(GPROC0_SEL, SEL_KPL)); 135242275Sneel} 136242275Sneel 137242275Sneeluint64_t 138242275Sneelvmm_get_host_fsbase(void) 139242275Sneel{ 140242275Sneel 141242275Sneel return (0); 142242275Sneel} 143242275Sneel 144242275Sneeluint64_t 145242275Sneelvmm_get_host_idtrbase(void) 146242275Sneel{ 147242275Sneel 148242275Sneel return (r_idt.rd_base); 149242275Sneel} 150261638Sjhb 151261638Sjhbconst struct xsave_limits * 152261638Sjhbvmm_get_xsave_limits(void) 153261638Sjhb{ 154261638Sjhb 155261638Sjhb return (&vmm_xsave_limits); 156261638Sjhb} 157