| /* |
| * Copyright (c) 2014-2017, Intel Corporation |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * * Neither the name of Intel Corporation nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "pt_asid.h" |
| |
| #include "intel-pt.h" |
| |
| #include <string.h> |
| |
| |
| int pt_asid_from_user(struct pt_asid *asid, const struct pt_asid *user) |
| { |
| if (!asid) |
| return -pte_internal; |
| |
| pt_asid_init(asid); |
| |
| if (user) { |
| size_t size; |
| |
| size = user->size; |
| |
| /* Ignore fields in the user's asid we don't know. */ |
| if (sizeof(*asid) < size) |
| size = sizeof(*asid); |
| |
| /* Copy (portions of) the user's asid. */ |
| memcpy(asid, user, size); |
| |
| /* We copied user's size - fix it. */ |
| asid->size = sizeof(*asid); |
| } |
| |
| return 0; |
| } |
| |
| int pt_asid_to_user(struct pt_asid *user, const struct pt_asid *asid, |
| size_t size) |
| { |
| if (!user || !asid) |
| return -pte_internal; |
| |
| /* We need at least space for the size field. */ |
| if (size < sizeof(asid->size)) |
| return -pte_invalid; |
| |
| /* Only provide the fields we actually have. */ |
| if (sizeof(*asid) < size) |
| size = sizeof(*asid); |
| |
| /* Copy (portions of) our asid to the user's. */ |
| memcpy(user, asid, size); |
| |
| /* We copied our size - fix it. */ |
| user->size = size; |
| |
| return 0; |
| } |
| |
| int pt_asid_match(const struct pt_asid *lhs, const struct pt_asid *rhs) |
| { |
| uint64_t lcr3, rcr3, lvmcs, rvmcs; |
| |
| if (!lhs || !rhs) |
| return -pte_internal; |
| |
| lcr3 = lhs->cr3; |
| rcr3 = rhs->cr3; |
| |
| if (lcr3 != rcr3 && lcr3 != pt_asid_no_cr3 && rcr3 != pt_asid_no_cr3) |
| return 0; |
| |
| lvmcs = lhs->vmcs; |
| rvmcs = rhs->vmcs; |
| |
| if (lvmcs != rvmcs && lvmcs != pt_asid_no_vmcs && |
| rvmcs != pt_asid_no_vmcs) |
| return 0; |
| |
| return 1; |
| } |