1/*
2 * Copyright (c) 2014-2018, 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
36int 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
62int 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
85int 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