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 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 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 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