diff options
Diffstat (limited to 'virt/kvm/kvm_main.c')
| -rw-r--r-- | virt/kvm/kvm_main.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 4f3ac8b753b6..7837fd524296 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -107,6 +107,7 @@ static atomic_t hardware_enable_failed; static struct kmem_cache *kvm_vcpu_cache; static __read_mostly struct preempt_ops kvm_preempt_ops; +static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_running_vcpu); struct dentry *kvm_debugfs_dir; EXPORT_SYMBOL_GPL(kvm_debugfs_dir); @@ -196,6 +197,8 @@ bool kvm_is_reserved_pfn(kvm_pfn_t pfn) void vcpu_load(struct kvm_vcpu *vcpu) { int cpu = get_cpu(); + + __this_cpu_write(kvm_running_vcpu, vcpu); preempt_notifier_register(&vcpu->preempt_notifier); kvm_arch_vcpu_load(vcpu, cpu); put_cpu(); @@ -207,6 +210,7 @@ void vcpu_put(struct kvm_vcpu *vcpu) preempt_disable(); kvm_arch_vcpu_put(vcpu); preempt_notifier_unregister(&vcpu->preempt_notifier); + __this_cpu_write(kvm_running_vcpu, NULL); preempt_enable(); } EXPORT_SYMBOL_GPL(vcpu_put); @@ -4288,8 +4292,8 @@ static void kvm_sched_in(struct preempt_notifier *pn, int cpu) WRITE_ONCE(vcpu->preempted, false); WRITE_ONCE(vcpu->ready, false); + __this_cpu_write(kvm_running_vcpu, vcpu); kvm_arch_sched_in(vcpu, cpu); - kvm_arch_vcpu_load(vcpu, cpu); } @@ -4303,6 +4307,25 @@ static void kvm_sched_out(struct preempt_notifier *pn, WRITE_ONCE(vcpu->ready, true); } kvm_arch_vcpu_put(vcpu); + __this_cpu_write(kvm_running_vcpu, NULL); +} + +/** + * kvm_get_running_vcpu - get the vcpu running on the current CPU. + * Thanks to preempt notifiers, this can also be called from + * preemptible context. + */ +struct kvm_vcpu *kvm_get_running_vcpu(void) +{ + return __this_cpu_read(kvm_running_vcpu); +} + +/** + * kvm_get_running_vcpus - get the per-CPU array of currently running vcpus. + */ +struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) +{ + return &kvm_running_vcpu; } static void check_processor_compat(void *rtn) |