vmm_host.c revision 245652 
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: head/sys/amd64/vmm/vmm_host.c 242275 2012-10-29 01:51:24Z neel $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/amd64/vmm/vmm_host.c 242275 2012-10-29 01:51:24Z neel $");
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
43void
44vmm_host_state_init(void)
45{
46
47	vmm_host_efer = rdmsr(MSR_EFER);
48	vmm_host_pat = rdmsr(MSR_PAT);
49
50	/*
51	 * We always want CR0.TS to be set when the processor does a VM exit.
52	 *
53	 * With emulation turned on unconditionally after a VM exit, we are
54	 * able to trap inadvertent use of the FPU until the guest FPU state
55	 * has been safely squirreled away.
56	 */
57	vmm_host_cr0 = rcr0() | CR0_TS;
58
59	vmm_host_cr4 = rcr4();
60}
61
62uint64_t
63vmm_get_host_pat(void)
64{
65
66	return (vmm_host_pat);
67}
68
69uint64_t
70vmm_get_host_efer(void)
71{
72
73	return (vmm_host_efer);
74}
75
76uint64_t
77vmm_get_host_cr0(void)
78{
79
80	return (vmm_host_cr0);
81}
82
83uint64_t
84vmm_get_host_cr4(void)
85{
86
87	return (vmm_host_cr4);
88}
89
90uint64_t
91vmm_get_host_datasel(void)
92{
93
94	return (GSEL(GDATA_SEL, SEL_KPL));
95
96}
97
98uint64_t
99vmm_get_host_codesel(void)
100{
101
102	return (GSEL(GCODE_SEL, SEL_KPL));
103}
104
105uint64_t
106vmm_get_host_tsssel(void)
107{
108
109	return (GSEL(GPROC0_SEL, SEL_KPL));
110}
111
112uint64_t
113vmm_get_host_fsbase(void)
114{
115
116	return (0);
117}
118
119uint64_t
120vmm_get_host_idtrbase(void)
121{
122
123	return (r_idt.rd_base);
124}
125