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- Remove dead code leftovers after a recent mitigations cleanup which fail

Browse source 
a Clang build
 
 - Make sure a Retbleed mitigation message is printed only when necessary
 
 - Correct the last Zen1 microcode revision for which Entrysign sha256 check is
   needed
 
 - Fix a NULL ptr deref when mounting the resctrl fs on a system which supports
   assignable counters but where L3 total and local bandwidth monitoring has
   been disabled at boot
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Merge tag 'x86_urgent_for_v6.18_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Borislav Petkov:

 - Remove dead code leftovers after a recent mitigations cleanup which
   fail a Clang build

 - Make sure a Retbleed mitigation message is printed only when
   necessary

 - Correct the last Zen1 microcode revision for which Entrysign sha256
   check is needed

 - Fix a NULL ptr deref when mounting the resctrl fs on a system which
   supports assignable counters but where L3 total and local bandwidth
   monitoring has been disabled at boot

* tag 'x86_urgent_for_v6.18_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/bugs: Remove dead code which might prevent from building
  x86/bugs: Qualify RETBLEED_INTEL_MSG
  x86/microcode: Fix Entrysign revision check for Zen1/Naples
  x86,fs/resctrl: Fix NULL pointer dereference with events force-disabled in mbm_event mode
This commit is contained in:
Linus Torvalds 2025-10-26 09:57:18 -07:00
commit dbfc6422a3
4 changed files with 21 additions and 19 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

11
arch/x86/kernel/cpu/bugs.c
View file

@ -1463,7 +1463,9 @@ static void __init retbleed_update_mitigation(void)
break;
default:
if (retbleed_mitigation != RETBLEED_MITIGATION_STUFF) {
pr_err(RETBLEED_INTEL_MSG);
if (retbleed_mitigation != RETBLEED_MITIGATION_NONE)
pr_err(RETBLEED_INTEL_MSG);
retbleed_mitigation = RETBLEED_MITIGATION_NONE;
}
}
@ -1825,13 +1827,6 @@ void unpriv_ebpf_notify(int new_state)
}
#endif
static inline bool match_option(const char *arg, int arglen, const char *opt)
{
int len = strlen(opt);
return len == arglen && !strncmp(arg, opt, len);
}
/* The kernel command line selection for spectre v2 */
enum spectre_v2_mitigation_cmd {
SPECTRE_V2_CMD_NONE,

2
arch/x86/kernel/cpu/microcode/amd.c
View file

@ -194,7 +194,7 @@ static bool need_sha_check(u32 cur_rev)
}
switch (cur_rev >> 8) {
case 0x80012: return cur_rev <= 0x800126f; break;
case 0x80012: return cur_rev <= 0x8001277; break;
case 0x80082: return cur_rev <= 0x800820f; break;
case 0x83010: return cur_rev <= 0x830107c; break;
case 0x86001: return cur_rev <= 0x860010e; break;

11
arch/x86/kernel/cpu/resctrl/monitor.c
View file

@ -458,7 +458,16 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
r->mon.mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS;
}
if (rdt_cpu_has(X86_FEATURE_ABMC)) {
/*
* resctrl assumes a system that supports assignable counters can
* switch to "default" mode. Ensure that there is a "default" mode
* to switch to. This enforces a dependency between the independent
* X86_FEATURE_ABMC and X86_FEATURE_CQM_MBM_TOTAL/X86_FEATURE_CQM_MBM_LOCAL
* hardware features.
*/
if (rdt_cpu_has(X86_FEATURE_ABMC) &&
(rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL) ||
rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))) {
r->mon.mbm_cntr_assignable = true;
cpuid_count(0x80000020, 5, &eax, &ebx, &ecx, &edx);
r->mon.num_mbm_cntrs = (ebx & GENMASK(15, 0)) + 1;

16
fs/resctrl/monitor.c
View file

@ -1782,15 +1782,13 @@ int resctrl_mon_resource_init(void)
mba_mbps_default_event = QOS_L3_MBM_TOTAL_EVENT_ID;
if (r->mon.mbm_cntr_assignable) {
if (!resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID))
resctrl_enable_mon_event(QOS_L3_MBM_TOTAL_EVENT_ID);
if (!resctrl_is_mon_event_enabled(QOS_L3_MBM_LOCAL_EVENT_ID))
resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID);
mon_event_all[QOS_L3_MBM_TOTAL_EVENT_ID].evt_cfg = r->mon.mbm_cfg_mask;
mon_event_all[QOS_L3_MBM_LOCAL_EVENT_ID].evt_cfg = r->mon.mbm_cfg_mask &
(READS_TO_LOCAL_MEM |
READS_TO_LOCAL_S_MEM |
NON_TEMP_WRITE_TO_LOCAL_MEM);
if (resctrl_is_mon_event_enabled(QOS_L3_MBM_TOTAL_EVENT_ID))
mon_event_all[QOS_L3_MBM_TOTAL_EVENT_ID].evt_cfg = r->mon.mbm_cfg_mask;
if (resctrl_is_mon_event_enabled(QOS_L3_MBM_LOCAL_EVENT_ID))
mon_event_all[QOS_L3_MBM_LOCAL_EVENT_ID].evt_cfg = r->mon.mbm_cfg_mask &
(READS_TO_LOCAL_MEM |
READS_TO_LOCAL_S_MEM |
NON_TEMP_WRITE_TO_LOCAL_MEM);
r->mon.mbm_assign_on_mkdir = true;
resctrl_file_fflags_init("num_mbm_cntrs",
RFTYPE_MON_INFO | RFTYPE_RES_CACHE);