1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
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 unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD: stable/12/sys/amd64/vmm/amd/npt.c 335030 2018-06-13 07:02:58Z araujo $");
31
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/systm.h>
35 #include <sys/sysctl.h>
36
37 #include <vm/vm.h>
38 #include <vm/pmap.h>
39 #include <vm/vm_extern.h>
40
41 #include "npt.h"
42
43 SYSCTL_DECL(_hw_vmm);
44 SYSCTL_NODE(_hw_vmm, OID_AUTO, npt, CTLFLAG_RW, NULL, NULL);
45
46 static int npt_flags;
47 SYSCTL_INT(_hw_vmm_npt, OID_AUTO, pmap_flags, CTLFLAG_RD,
48 &npt_flags, 0, NULL);
49
50 #define NPT_IPIMASK 0xFF
51
52 /*
53 * AMD nested page table init.
54 */
55 int
svm_npt_init(int ipinum)56 svm_npt_init(int ipinum)
57 {
58 int enable_superpage = 1;
59
60 npt_flags = ipinum & NPT_IPIMASK;
61 TUNABLE_INT_FETCH("hw.vmm.npt.enable_superpage", &enable_superpage);
62 if (enable_superpage)
63 npt_flags |= PMAP_PDE_SUPERPAGE;
64
65 return (0);
66 }
67
68 static int
npt_pinit(pmap_t pmap)69 npt_pinit(pmap_t pmap)
70 {
71
72 return (pmap_pinit_type(pmap, PT_RVI, npt_flags));
73 }
74
75 struct vmspace *
svm_npt_alloc(vm_offset_t min,vm_offset_t max)76 svm_npt_alloc(vm_offset_t min, vm_offset_t max)
77 {
78
79 return (vmspace_alloc(min, max, npt_pinit));
80 }
81
82 void
svm_npt_free(struct vmspace * vmspace)83 svm_npt_free(struct vmspace *vmspace)
84 {
85
86 vmspace_free(vmspace);
87 }
88