From 62e81568e375272dc52a649e841b496dd1c12a43 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Fri, 13 Jul 2018 16:23:24 +0200
Subject: [PATCH 09/11] cpu/hotplug: Set CPU_SMT_NOT_SUPPORTED early
Patch-mainline: v4.19-rc1
Git-commit: fee0aede6f4739c87179eca76136f83210953b86
References: bsc#1089343 CVE-2018-3646
commit fee0aede6f4739c87179eca76136f83210953b86 upstream
The CPU_SMT_NOT_SUPPORTED state is set (if the processor does not support
SMT) when the sysfs SMT control file is initialized.
That was fine so far as this was only required to make the output of the
control file correct and to prevent writes in that case.
With the upcoming l1tf command line parameter, this needs to be set up
before the L1TF mitigation selection and command line parsing happens.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20180713142323.121795971@linutronix.de
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---
arch/x86/kernel/cpu/bugs.c | 6 ++++++
include/linux/cpu.h | 2 ++
kernel/cpu.c | 13 ++++++++++---
3 files changed, 18 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -58,6 +58,12 @@ void __init check_bugs(void)
{
identify_boot_cpu();
+ /*
+ * identify_boot_cpu() initialized SMT support information, let the
+ * core code know.
+ */
+ cpu_smt_check_topology();
+
if (!IS_ENABLED(CONFIG_SMP)) {
pr_info("CPU: ");
print_cpu_info(&boot_cpu_data);
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -187,9 +187,11 @@ enum cpuhp_smt_control {
#if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT)
extern enum cpuhp_smt_control cpu_smt_control;
extern void cpu_smt_disable(bool force);
+extern void cpu_smt_check_topology(void);
#else
# define cpu_smt_control (CPU_SMT_ENABLED)
static inline void cpu_smt_disable(bool force) { }
+static inline void cpu_smt_check_topology(void) { }
#endif
#endif /* _LINUX_CPU_H_ */
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -363,6 +363,16 @@ void __init cpu_smt_disable(bool force)
}
}
+/*
+ * The decision whether SMT is supported can only be done after the full
+ * CPU identification. Called from architecture code.
+ */
+void __init cpu_smt_check_topology(void)
+{
+ if (!topology_smt_supported())
+ cpu_smt_control = CPU_SMT_NOT_SUPPORTED;
+}
+
static int __init smt_cmdline_disable(char *str)
{
cpu_smt_disable(str && !strcmp(str, "force"));
@@ -1919,9 +1929,6 @@ static const struct attribute_group cpuh
static int __init cpu_smt_state_init(void)
{
- if (!topology_smt_supported())
- cpu_smt_control = CPU_SMT_NOT_SUPPORTED;
-
return sysfs_create_group(&cpu_subsys.dev_root->kobj,
&cpuhp_smt_attr_group);
}