Enable virtualization when slave CPUs are activated, and disable when
the CPUs are dying using slave CPU notifier call chain.
In x86, TSC kHz must also be initialized by tsc_khz_changed when the
new slave CPUs are activated.
Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama.qu@xxxxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxx>
Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
---
arch/x86/kvm/x86.c | 20 ++++++++++++++++++++
virt/kvm/kvm_main.c | 38 ++++++++++++++++++++++++++++++++++++--
2 files changed, 56 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4a69c66..9bb2f8f2 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -61,6 +61,7 @@
#include <asm/xcr.h>
#include <asm/pvclock.h>
#include <asm/div64.h>
+#include <asm/cpu.h>
#define MAX_IO_MSRS 256
#define KVM_MAX_MCE_BANKS 32
@@ -4769,9 +4770,15 @@ static int kvmclock_cpu_notifier(struct notifier_block *nfb,
switch (action) {
case CPU_ONLINE:
case CPU_DOWN_FAILED:
+#ifdef CONFIG_SLAVE_CPU
+ case CPU_SLAVE_UP:
+#endif
smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
break;
case CPU_DOWN_PREPARE:
+#ifdef CONFIG_SLAVE_CPU
+ case CPU_SLAVE_DYING:
+#endif
smp_call_function_single(cpu, tsc_bad, NULL, 1);
break;
}
@@ -4783,12 +4790,20 @@ static struct notifier_block kvmclock_cpu_notifier_block = {
.priority = -INT_MAX
};
+static struct notifier_block kvmclock_slave_cpu_notifier_block = {
+ .notifier_call = kvmclock_cpu_notifier,
+ .priority = -INT_MAX
+};
+
static void kvm_timer_init(void)
{
int cpu;
max_tsc_khz = tsc_khz;
register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
+#ifdef CONFIG_SLAVE_CPU
+ register_slave_cpu_notifier(&kvmclock_slave_cpu_notifier_block);
+#endif
if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
#ifdef CONFIG_CPU_FREQ
struct cpufreq_policy policy;
@@ -4805,6 +4820,8 @@ static void kvm_timer_init(void)
pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
for_each_online_cpu(cpu)
smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
+ for_each_slave_cpu(cpu)
+ smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
}
static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
@@ -4930,6 +4947,9 @@ void kvm_arch_exit(void)
cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
+#ifdef CONFIG_SLAVE_CPU
+ unregister_slave_cpu_notifier(&kvmclock_slave_cpu_notifier_block);
+#endif
kvm_x86_ops = NULL;
kvm_mmu_module_exit();
}
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 7e14068..f5890f0 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -54,6 +54,9 @@
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
+#ifdef CONFIG_X86
+#include <asm/cpu.h>
+#endif
#include "coalesced_mmio.h"
#include "async_pf.h"
@@ -2323,11 +2326,17 @@ static void hardware_disable(void *junk)
static void hardware_disable_all_nolock(void)
{
+ int cpu;
+
BUG_ON(!kvm_usage_count);
kvm_usage_count--;
- if (!kvm_usage_count)
+ if (!kvm_usage_count) {
on_each_cpu(hardware_disable_nolock, NULL, 1);
+ for_each_slave_cpu(cpu)
+ smp_call_function_single(cpu, hardware_disable_nolock,
+ NULL, 1);
+ }
}
static void hardware_disable_all(void)
@@ -2340,6 +2349,7 @@ static void hardware_disable_all(void)
static int hardware_enable_all(void)
{
int r = 0;
+ int cpu;
raw_spin_lock(&kvm_lock);
@@ -2347,6 +2357,9 @@ static int hardware_enable_all(void)
if (kvm_usage_count == 1) {
atomic_set(&hardware_enable_failed, 0);
on_each_cpu(hardware_enable_nolock, NULL, 1);
+ for_each_slave_cpu(cpu)
+ smp_call_function_single(cpu, hardware_enable_nolock,
+ NULL, 1);
if (atomic_read(&hardware_enable_failed)) {
hardware_disable_all_nolock();
@@ -2370,11 +2383,17 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
val &= ~CPU_TASKS_FROZEN;
switch (val) {
case CPU_DYING:
+#ifdef CONFIG_SLAVE_CPU
+ case CPU_SLAVE_DYING:
+#endif
printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
cpu);
hardware_disable(NULL);
break;
case CPU_STARTING:
+#ifdef CONFIG_SLAVE_CPU
+ case CPU_SLAVE_UP:
+#endif
printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
cpu);
hardware_enable(NULL);
@@ -2592,6 +2611,12 @@ static struct notifier_block kvm_cpu_notifier = {
.notifier_call = kvm_cpu_hotplug,
};
+#ifdef CONFIG_SLAVE_CPU
+static struct notifier_block kvm_slave_cpu_notifier = {
+ .notifier_call = kvm_cpu_hotplug,
+};
+#endif
+
static int vm_stat_get(void *_offset, u64 *val)
{
unsigned offset = (long)_offset;
@@ -2755,7 +2780,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
if (r < 0)
goto out_free_0a;
- for_each_online_cpu(cpu) {
+ for_each_cpu(cpu, cpu_online_or_slave_mask) {
smp_call_function_single(cpu,
kvm_arch_check_processor_compat,
&r, 1);
@@ -2766,6 +2791,9 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
r = register_cpu_notifier(&kvm_cpu_notifier);
if (r)
goto out_free_2;
+#ifdef CONFIG_SLAVE_CPU
+ register_slave_cpu_notifier(&kvm_slave_cpu_notifier);
+#endif
register_reboot_notifier(&kvm_reboot_notifier);
/* A kmem cache lets us meet the alignment requirements of fx_save. */
@@ -2813,6 +2841,9 @@ out_free:
kmem_cache_destroy(kvm_vcpu_cache);
out_free_3:
unregister_reboot_notifier(&kvm_reboot_notifier);
+#ifdef CONFIG_SLAVE_CPU
+ unregister_slave_cpu_notifier(&kvm_slave_cpu_notifier);
+#endif
unregister_cpu_notifier(&kvm_cpu_notifier);
out_free_2:
out_free_1:
@@ -2840,6 +2871,9 @@ void kvm_exit(void)
kvm_async_pf_deinit();
unregister_syscore_ops(&kvm_syscore_ops);
unregister_reboot_notifier(&kvm_reboot_notifier);
+#ifdef CONFIG_SLAVE_CPU
+ unregister_slave_cpu_notifier(&kvm_slave_cpu_notifier);
+#endif
unregister_cpu_notifier(&kvm_cpu_notifier);
on_each_cpu(hardware_disable_nolock, NULL, 1);
kvm_arch_hardware_unsetup();
--
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