1 /*
2 * Copyright (c) 2014-2019, Intel Corporation
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * * Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright notice,
10 * this list of conditions and the following disclaimer in the documentation
11 * and/or other materials provided with the distribution.
12 * * Neither the name of Intel Corporation nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "pt_asid.h"
30
31 #include "intel-pt.h"
32
33 #include <string.h>
34
35
pt_asid_from_user(struct pt_asid * asid,const struct pt_asid * user)36 int pt_asid_from_user(struct pt_asid *asid, const struct pt_asid *user)
37 {
38 if (!asid)
39 return -pte_internal;
40
41 pt_asid_init(asid);
42
43 if (user) {
44 size_t size;
45
46 size = user->size;
47
48 /* Ignore fields in the user's asid we don't know. */
49 if (sizeof(*asid) < size)
50 size = sizeof(*asid);
51
52 /* Copy (portions of) the user's asid. */
53 memcpy(asid, user, size);
54
55 /* We copied user's size - fix it. */
56 asid->size = sizeof(*asid);
57 }
58
59 return 0;
60 }
61
pt_asid_to_user(struct pt_asid * user,const struct pt_asid * asid,size_t size)62 int pt_asid_to_user(struct pt_asid *user, const struct pt_asid *asid,
63 size_t size)
64 {
65 if (!user || !asid)
66 return -pte_internal;
67
68 /* We need at least space for the size field. */
69 if (size < sizeof(asid->size))
70 return -pte_invalid;
71
72 /* Only provide the fields we actually have. */
73 if (sizeof(*asid) < size)
74 size = sizeof(*asid);
75
76 /* Copy (portions of) our asid to the user's. */
77 memcpy(user, asid, size);
78
79 /* We copied our size - fix it. */
80 user->size = size;
81
82 return 0;
83 }
84
pt_asid_match(const struct pt_asid * lhs,const struct pt_asid * rhs)85 int pt_asid_match(const struct pt_asid *lhs, const struct pt_asid *rhs)
86 {
87 uint64_t lcr3, rcr3, lvmcs, rvmcs;
88
89 if (!lhs || !rhs)
90 return -pte_internal;
91
92 lcr3 = lhs->cr3;
93 rcr3 = rhs->cr3;
94
95 if (lcr3 != rcr3 && lcr3 != pt_asid_no_cr3 && rcr3 != pt_asid_no_cr3)
96 return 0;
97
98 lvmcs = lhs->vmcs;
99 rvmcs = rhs->vmcs;
100
101 if (lvmcs != rvmcs && lvmcs != pt_asid_no_vmcs &&
102 rvmcs != pt_asid_no_vmcs)
103 return 0;
104
105 return 1;
106 }
107