| cpu_machdep.c (361561) | cpu_machdep.c (362383) |
|---|---|
| 1/*- 2 * Copyright (c) 2003 Peter Wemm. 3 * Copyright (c) 1992 Terrence R. Lambert. 4 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. --- 25 unchanged lines hidden (view full) --- 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 39 */ 40 41#include <sys/cdefs.h> | 1/*- 2 * Copyright (c) 2003 Peter Wemm. 3 * Copyright (c) 1992 Terrence R. Lambert. 4 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. --- 25 unchanged lines hidden (view full) --- 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 39 */ 40 41#include <sys/cdefs.h> |
| 42__FBSDID("$FreeBSD: stable/11/sys/x86/x86/cpu_machdep.c 361561 2020-05-27 18:55:24Z kib $"); | 42__FBSDID("$FreeBSD: stable/11/sys/x86/x86/cpu_machdep.c 362383 2020-06-19 13:48:23Z kib $"); |
| 43 44#include "opt_atpic.h" 45#include "opt_compat.h" 46#include "opt_cpu.h" 47#include "opt_ddb.h" 48#include "opt_inet.h" 49#include "opt_isa.h" 50#include "opt_kdb.h" --- 1308 unchanged lines hidden (view full) --- 1359 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1360 sysctl_taa_state_handler, "A", 1361 "TAA Mitigation state"); 1362 1363int __read_frequently cpu_flush_rsb_ctxsw; 1364SYSCTL_INT(_machdep_mitigations, OID_AUTO, flush_rsb_ctxsw, 1365 CTLFLAG_RW | CTLFLAG_NOFETCH, &cpu_flush_rsb_ctxsw, 0, 1366 "Flush Return Stack Buffer on context switch"); | 43 44#include "opt_atpic.h" 45#include "opt_compat.h" 46#include "opt_cpu.h" 47#include "opt_ddb.h" 48#include "opt_inet.h" 49#include "opt_isa.h" 50#include "opt_kdb.h" --- 1308 unchanged lines hidden (view full) --- 1359 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1360 sysctl_taa_state_handler, "A", 1361 "TAA Mitigation state"); 1362 1363int __read_frequently cpu_flush_rsb_ctxsw; 1364SYSCTL_INT(_machdep_mitigations, OID_AUTO, flush_rsb_ctxsw, 1365 CTLFLAG_RW | CTLFLAG_NOFETCH, &cpu_flush_rsb_ctxsw, 0, 1366 "Flush Return Stack Buffer on context switch"); |
| 1367 1368SYSCTL_NODE(_machdep_mitigations, OID_AUTO, rngds, 1369 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 1370 "MCU Optimization, disable RDSEED mitigation"); 1371 1372int x86_rngds_mitg_enable = 1; 1373void 1374x86_rngds_mitg_recalculate(bool all_cpus) 1375{ 1376 if ((cpu_stdext_feature3 & CPUID_STDEXT3_MCUOPT) == 0) 1377 return; 1378 x86_msr_op(MSR_IA32_MCU_OPT_CTRL, 1379 (x86_rngds_mitg_enable ? MSR_OP_OR : MSR_OP_ANDNOT) | 1380 (all_cpus ? MSR_OP_RENDEZVOUS : MSR_OP_LOCAL), 1381 IA32_RNGDS_MITG_DIS); 1382} 1383 1384static int 1385sysctl_rngds_mitg_enable_handler(SYSCTL_HANDLER_ARGS) 1386{ 1387 int error, val; 1388 1389 val = x86_rngds_mitg_enable; 1390 error = sysctl_handle_int(oidp, &val, 0, req); 1391 if (error != 0 || req->newptr == NULL) 1392 return (error); 1393 x86_rngds_mitg_enable = val; 1394 x86_rngds_mitg_recalculate(true); 1395 return (0); 1396} 1397SYSCTL_PROC(_machdep_mitigations_rngds, OID_AUTO, enable, CTLTYPE_INT | 1398 CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, NULL, 0, 1399 sysctl_rngds_mitg_enable_handler, "I", 1400 "MCU Optimization, disabling RDSEED mitigation control " 1401 "(0 - mitigation disabled (RDSEED optimized), 1 - mitigation enabled"); 1402 1403static int 1404sysctl_rngds_state_handler(SYSCTL_HANDLER_ARGS) 1405{ 1406 const char *state; 1407 1408 if ((cpu_stdext_feature3 & CPUID_STDEXT3_MCUOPT) == 0) { 1409 state = "Not applicable"; 1410 } else if (x86_rngds_mitg_enable == 0) { 1411 state = "RDSEED not serialized"; 1412 } else { 1413 state = "Mitigated"; 1414 } 1415 return (SYSCTL_OUT(req, state, strlen(state))); 1416} 1417SYSCTL_PROC(_machdep_mitigations_rngds, OID_AUTO, state, 1418 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0, 1419 sysctl_rngds_state_handler, "A", 1420 "MCU Optimization state"); |
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