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...@hitachi.com> Cc: Avi Kivity <a...@redhat.com> Cc: Marcelo Tosatti <mtosa...@redhat.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: Ingo Molnar <mi...@redhat.com> Cc: "H. Peter Anvin" <h...@zytor.com> --- arch/x86/kvm/x86.c | 16 ++++++++++++++++ virt/kvm/kvm_main.c | 30 ++++++++++++++++++++++++++++-- 2 files changed, 44 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 148ed66..7501cc4 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 @@ -4782,9 +4783,15 @@ 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; } @@ -4796,12 +4803,18 @@ 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); + register_slave_cpu_notifier(&kvmclock_slave_cpu_notifier_block); if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) { #ifdef CONFIG_CPU_FREQ struct cpufreq_policy policy; @@ -4818,6 +4831,8 @@ 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); @@ -4943,6 +4958,7 @@ void kvm_arch_exit(void) cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, CPUFREQ_TRANSITION_NOTIFIER); unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block); + unregister_slave_cpu_notifier(&kvmclock_slave_cpu_notifier_block); kvm_x86_ops = NULL; kvm_mmu_module_exit(); } diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d617f69..dc86e9a 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" @@ -2336,11 +2339,17 @@ 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) @@ -2353,6 +2362,7 @@ static void hardware_disable_all(void) static int hardware_enable_all(void) { int r = 0; + int cpu; raw_spin_lock(&kvm_lock); @@ -2360,6 +2370,9 @@ 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(); @@ -2383,11 +2396,17 @@ 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); @@ -2605,6 +2624,10 @@ static struct notifier_block kvm_cpu_notifier = { .notifier_call = kvm_cpu_hotplug, }; +static struct notifier_block kvm_slave_cpu_notifier = { + .notifier_call = kvm_cpu_hotplug, +}; + static int vm_stat_get(void *_offset, u64 *val) { unsigned offset = (long)_offset; @@ -2768,7 +2791,7 @@ 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); @@ -2779,6 +2802,7 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, r = register_cpu_notifier(&kvm_cpu_notifier); if (r) goto out_free_2; + register_slave_cpu_notifier(&kvm_slave_cpu_notifier); register_reboot_notifier(&kvm_reboot_notifier); /* A kmem cache lets us meet the alignment requirements of fx_save. */ @@ -2826,6 +2850,7 @@ out_free: kmem_cache_destroy(kvm_vcpu_cache); out_free_3: unregister_reboot_notifier(&kvm_reboot_notifier); + unregister_slave_cpu_notifier(&kvm_slave_cpu_notifier); unregister_cpu_notifier(&kvm_cpu_notifier); out_free_2: out_free_1: @@ -2853,6 +2878,7 @@ void kvm_exit(void) kvm_async_pf_deinit(); unregister_syscore_ops(&kvm_syscore_ops); unregister_reboot_notifier(&kvm_reboot_notifier); + unregister_slave_cpu_notifier(&kvm_slave_cpu_notifier); unregister_cpu_notifier(&kvm_cpu_notifier); on_each_cpu(hardware_disable_nolock, NULL, 1); kvm_arch_hardware_unsetup(); -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html