x86, pat/mtrr: Rendezvous all the cpus for MTRR/PAT init
SDM Vol 3a section titled "MTRR considerations in MP systems" specifies
the need for synchronizing the logical cpu's while initializing/updating
MTRR.
Currently Linux kernel does the synchronization of all cpu's only when
a single MTRR register is programmed/updated. During an AP online
(during boot/cpu-online/resume) where we initialize all the MTRR/PAT registers,
we don't follow this synchronization algorithm.
This can lead to scenarios where during a dynamic cpu online, that logical cpu
is initializing MTRR/PAT with cache disabled (cr0.cd=1) etc while other logical
HT sibling continue to run (also with cache disabled because of cr0.cd=1
on its sibling).
Starting from Westmere, VMX transitions with cr0.cd=1 don't work properly
(because of some VMX performance optimizations) and the above scenario
(with one logical cpu doing VMX activity and another logical cpu coming online)
can result in system crash.
Fix the MTRR initialization by doing rendezvous of all the cpus. During
boot and resume, we delay the MTRR/PAT init for APs till all the
logical cpu's come online and the rendezvous process at the end of AP's bringup,
will initialize the MTRR/PAT for all AP's.
For dynamic single cpu online, we synchronize all the logical cpus and
do the MTRR/PAT init on the AP that is coming online.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index a51ada8..d5366ec 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -121,8 +121,12 @@
extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
extern void mtrr_ap_init(void);
extern void mtrr_bp_init(void);
+extern void set_mtrr_aps_delayed_init(void);
+extern void mtrr_aps_init(void);
+extern void mtrr_bp_restore(void);
extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
extern int amd_special_default_mtrr(void);
+extern u32 mtrr_aps_delayed_init;
# else
static inline u8 mtrr_type_lookup(u64 addr, u64 end)
{
@@ -161,6 +165,9 @@
#define mtrr_ap_init() do {} while (0)
#define mtrr_bp_init() do {} while (0)
+#define set_mtrr_aps_delayed_init() do {} while (0)
+#define mtrr_aps_init() do {} while (0)
+#define mtrr_bp_restore() do {} while (0)
# endif
#ifdef CONFIG_COMPAT
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 7af0f88..7339be0 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -58,6 +58,7 @@
static DEFINE_MUTEX(mtrr_mutex);
u64 size_or_mask, size_and_mask;
+u32 mtrr_aps_delayed_init;
static struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM];
@@ -163,7 +164,10 @@
if (data->smp_reg != ~0U) {
mtrr_if->set(data->smp_reg, data->smp_base,
data->smp_size, data->smp_type);
- } else {
+ } else if (mtrr_aps_delayed_init) {
+ /*
+ * Initialize the MTRRs inaddition to the synchronisation.
+ */
mtrr_if->set_all();
}
@@ -265,6 +269,8 @@
*/
if (reg != ~0U)
mtrr_if->set(reg, base, size, type);
+ else if (!mtrr_aps_delayed_init)
+ mtrr_if->set_all();
/* Wait for the others */
while (atomic_read(&data.count))
@@ -721,9 +727,7 @@
void mtrr_ap_init(void)
{
- unsigned long flags;
-
- if (!mtrr_if || !use_intel())
+ if (!use_intel() || mtrr_aps_delayed_init)
return;
/*
* Ideally we should hold mtrr_mutex here to avoid mtrr entries
@@ -738,11 +742,7 @@
* 2. cpu hotadd time. We let mtrr_add/del_page hold cpuhotplug
* lock to prevent mtrr entry changes
*/
- local_irq_save(flags);
-
- mtrr_if->set_all();
-
- local_irq_restore(flags);
+ set_mtrr(~0U, 0, 0, 0);
}
/**
@@ -753,6 +753,34 @@
smp_call_function_single(0, mtrr_save_fixed_ranges, NULL, 1);
}
+void set_mtrr_aps_delayed_init(void)
+{
+ if (!use_intel())
+ return;
+
+ mtrr_aps_delayed_init = 1;
+}
+
+/*
+ * MTRR initialization for all AP's
+ */
+void mtrr_aps_init(void)
+{
+ if (!use_intel())
+ return;
+
+ set_mtrr(~0U, 0, 0, 0);
+ mtrr_aps_delayed_init = 0;
+}
+
+void mtrr_bp_restore(void)
+{
+ if (!use_intel())
+ return;
+
+ mtrr_if->set_all();
+}
+
static int __init mtrr_init_finialize(void)
{
if (!mtrr_if)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 2fecda6..d720b7e 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1116,9 +1116,22 @@
if (is_uv_system())
uv_system_init();
+
+ set_mtrr_aps_delayed_init();
out:
preempt_enable();
}
+
+void arch_enable_nonboot_cpus_begin(void)
+{
+ set_mtrr_aps_delayed_init();
+}
+
+void arch_enable_nonboot_cpus_end(void)
+{
+ mtrr_aps_init();
+}
+
/*
* Early setup to make printk work.
*/
@@ -1140,6 +1153,7 @@
setup_ioapic_dest();
#endif
check_nmi_watchdog();
+ mtrr_aps_init();
}
static int __initdata setup_possible_cpus = -1;
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index b3d20b9..417c9f5 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -242,7 +242,7 @@
fix_processor_context();
do_fpu_end();
- mtrr_ap_init();
+ mtrr_bp_restore();
#ifdef CONFIG_X86_OLD_MCE
mcheck_init(&boot_cpu_data);
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 8ce1004..f5f9485 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -413,6 +413,14 @@
return error;
}
+void __weak arch_enable_nonboot_cpus_begin(void)
+{
+}
+
+void __weak arch_enable_nonboot_cpus_end(void)
+{
+}
+
void __ref enable_nonboot_cpus(void)
{
int cpu, error;
@@ -424,6 +432,9 @@
goto out;
printk("Enabling non-boot CPUs ...\n");
+
+ arch_enable_nonboot_cpus_begin();
+
for_each_cpu(cpu, frozen_cpus) {
error = _cpu_up(cpu, 1);
if (!error) {
@@ -432,6 +443,9 @@
}
printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error);
}
+
+ arch_enable_nonboot_cpus_end();
+
cpumask_clear(frozen_cpus);
out:
cpu_maps_update_done();