Author: scottl
Date: Sat Nov 16 00:31:57 2019
New Revision: 354761
URL: https://svnweb.freebsd.org/changeset/base/354761
Log:
Partially revert r354760, it included a patch that wasn't ready yet.
Modified:
stable/12/sys/amd64/amd64/machdep.c
stable/12/sys/dev/cpuctl/cpuctl.c
stable/12/sys/x86/include/x86_var.h
stable/12/sys/x86/x86/cpu_machdep.c
Modified: stable/12/sys/amd64/amd64/machdep.c
==============================================================================
--- stable/12/sys/amd64/amd64/machdep.c Sat Nov 16 00:29:26 2019
(r354760)
+++ stable/12/sys/amd64/amd64/machdep.c Sat Nov 16 00:31:57 2019
(r354761)
@@ -1790,7 +1790,6 @@ hammer_time(u_int64_t modulep, u_int64_t physfree)
TUNABLE_INT_FETCH("machdep.syscall_ret_l1d_flush",
&syscall_ret_l1d_flush_mode);
TUNABLE_INT_FETCH("hw.mds_disable", &hw_mds_disable);
- TUNABLE_INT_FETCH("hw.tsx_disable", &hw_tsx_disable);
finishidentcpu(); /* Final stage of CPU initialization */
initializecpu(); /* Initialize CPU registers */
Modified: stable/12/sys/dev/cpuctl/cpuctl.c
==============================================================================
--- stable/12/sys/dev/cpuctl/cpuctl.c Sat Nov 16 00:29:26 2019
(r354760)
+++ stable/12/sys/dev/cpuctl/cpuctl.c Sat Nov 16 00:31:57 2019
(r354761)
@@ -546,7 +546,6 @@ cpuctl_do_eval_cpu_features(int cpu, struct thread *td
pmap_allow_2m_x_ept_recalculate();
#endif
hw_mds_recalculate();
- hw_tsx_recalculate();
printcpuinfo();
return (0);
}
Modified: stable/12/sys/x86/include/x86_var.h
==============================================================================
--- stable/12/sys/x86/include/x86_var.h Sat Nov 16 00:29:26 2019
(r354760)
+++ stable/12/sys/x86/include/x86_var.h Sat Nov 16 00:31:57 2019
(r354761)
@@ -87,7 +87,6 @@ extern int pti;
extern int hw_ibrs_active;
extern int hw_mds_disable;
extern int hw_ssb_active;
-extern int hw_tsx_disable;
struct pcb;
struct thread;
@@ -144,7 +143,6 @@ void handle_ibrs_exit(void);
void hw_ibrs_recalculate(void);
void hw_mds_recalculate(void);
void hw_ssb_recalculate(bool all_cpus);
-void hw_tsx_recalculate(void);
void nmi_call_kdb(u_int cpu, u_int type, struct trapframe *frame);
void nmi_call_kdb_smp(u_int type, struct trapframe *frame);
void nmi_handle_intr(u_int type, struct trapframe *frame);
Modified: stable/12/sys/x86/x86/cpu_machdep.c
==============================================================================
--- stable/12/sys/x86/x86/cpu_machdep.c Sat Nov 16 00:29:26 2019
(r354760)
+++ stable/12/sys/x86/x86/cpu_machdep.c Sat Nov 16 00:31:57 2019
(r354761)
@@ -1120,187 +1120,6 @@ SYSCTL_PROC(_hw, OID_AUTO, mds_disable, CTLTYPE_INT |
"Microarchitectural Data Sampling Mitigation "
"(0 - off, 1 - on VERW, 2 - on SW, 3 - on AUTO");
-int hw_tsx_disable;
-int hw_tsx_state;
-enum {
- TSX_TAA_NONE = 0,
- TSX_TAA_DISABLE = 1,
- TSX_TAA_VERW = 2,
- TSX_TAA_AUTO = 3
-};
-
-static void
-hw_tsx_set_one(bool enable)
-{
- uint64_t v;
-
- v = rdmsr(MSR_IA32_TSX_CTRL);
- if (enable)
- v |= (uint64_t)(IA32_TSX_CTRL_RTM_DISABLE |
- IA32_TSX_CTRL_TSX_CPUID_CLEAR);
- else
- v &= ~(uint64_t)(IA32_TSX_CTRL_RTM_DISABLE |
- IA32_TSX_CTRL_TSX_CPUID_CLEAR);
-
- wrmsr(MSR_IA32_TSX_CTRL, v);
-}
-
-static void
-hw_tsx_set(bool enable, bool all)
-{
- struct thread *td;
- int bound_cpu, i, is_bound;
-
- if (all) {
- td = curthread;
- thread_lock(td);
- is_bound = sched_is_bound(td);
- bound_cpu = td->td_oncpu;
- CPU_FOREACH(i) {
- sched_bind(td, i);
- hw_tsx_set_one(enable);
- }
- if (is_bound)
- sched_bind(td, bound_cpu);
- else
- sched_unbind(td);
- thread_unlock(td);
- } else
- hw_tsx_set_one(enable);
-
-}
-
-void
-hw_tsx_recalculate(void)
-{
- static int tsx_saved_mds_disable = 0;
- int tsx_need = 0, tsx_state = 0;
- int mds_disable = 0, need_mds_recalc = 0;
-
- /* Check CPUID.07h.EBX.HLE and RTM for the presence of TSX */
- if ((cpu_stdext_feature & CPUID_STDEXT_HLE) == 0 ||
- (cpu_stdext_feature & CPUID_STDEXT_RTM) == 0) {
- /* TSX is not present */
- hw_tsx_state = 0;
- return;
- }
-
- /* Check to see what mitigation options the CPU gives us */
- if (cpu_ia32_arch_caps & IA32_ARCH_CAP_TAA_NO)
- tsx_need = TSX_TAA_NONE;
- else if (cpu_ia32_arch_caps & IA32_ARCH_CAP_TSX_CTRL)
- tsx_need = TSX_TAA_DISABLE;
- else {
- /* No TSX specific remedies are available. */
- if (hw_tsx_disable == TSX_TAA_DISABLE) {
- /* The user asked for the disable option, but
- * it's not available. */
- if (bootverbose)
- printf("TSX control not available\n");
- return;
- } else
- tsx_need = TSX_TAA_VERW;
- }
-
- /* Can we automatically take action, or are we being forced? */
- if (hw_tsx_disable == TSX_TAA_AUTO)
- tsx_state = tsx_need;
- else
- tsx_state = hw_tsx_disable;
-
- /* No state change, nothing to do */
- if (tsx_state == hw_tsx_state) {
- if (bootverbose)
- printf("No TSX change made\n");
- return;
- }
-
- /* Does the MSR need to be turned on or off? */
- if (tsx_state == TSX_TAA_DISABLE)
- hw_tsx_set(1 /* enable */, 1 /* all */);
- else if (hw_tsx_state == TSX_TAA_DISABLE)
- hw_tsx_set(0 /* disable */, 1 /* all */);
-
- /* Does MDS need to be set to turn on VERW? */
- if (tsx_state == TSX_TAA_VERW) {
- tsx_saved_mds_disable = hw_mds_disable;
- mds_disable = hw_mds_disable = 1;
- need_mds_recalc = 1;
- } else if (hw_tsx_state == TSX_TAA_VERW) {
- mds_disable = hw_mds_disable = tsx_saved_mds_disable;
- need_mds_recalc = 1;
- }
- if (need_mds_recalc) {
- hw_mds_recalculate();
- if (mds_disable != hw_mds_disable) {
- if (bootverbose)
- printf("Cannot change MDS state for TSX\n");
- /* Don't update our state */
- return;
- }
- }
-
- hw_tsx_state = tsx_state;
- return;
-}
-
-static void
-hw_tsx_recalculate_boot(void * arg __unused)
-{
-
- hw_tsx_recalculate();
-}
-SYSINIT(tsx_recalc, SI_SUB_SMP, SI_ORDER_ANY, hw_tsx_recalculate_boot, NULL);
-
-static int
-sysctl_tsx_disable_handler(SYSCTL_HANDLER_ARGS)
-{
- int error, val;
-
- val = hw_tsx_disable;
- error = sysctl_handle_int(oidp, &val, 0, req);
- if (error != 0 || req->newptr == NULL)
- return (error);
- if (val < 0 || val > 3)
- return (EINVAL);
- hw_tsx_disable = val;
- hw_tsx_recalculate();
- return (0);
-}
-
-SYSCTL_PROC(_hw, OID_AUTO, tsx_disable, CTLTYPE_INT |
- CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, NULL, 0,
- sysctl_tsx_disable_handler, "I",
- "TSX Asynchronous Abort Mitigation "
- "(0 - off, 1 - disable TSX, 2 - MDS/VERW, 3 - on AUTO");
-
-static int
-sysctl_hw_tsx_disable_state_handler(SYSCTL_HANDLER_ARGS)
-{
- const char *state;
-
- switch (hw_tsx_state) {
- case TSX_TAA_NONE:
- state = "inactive";
- break;
- case TSX_TAA_DISABLE:
- state = "TSX disabled";
- break;
- case TSX_TAA_VERW:
- state = "MDS/VERW";
- break;
- default:
- state = "unknown";
- }
-
- return (SYSCTL_OUT(req, state, strlen(state)));
-}
-
-SYSCTL_PROC(_hw, OID_AUTO, tsx_disable_state,
- CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
- sysctl_hw_tsx_disable_state_handler, "A",
- "Transactional Memory Asynchronous Abort Mitigation state");
-
/*
* Enable and restore kernel text write permissions.
* Callers must ensure that disable_wp()/restore_wp() are executed
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