diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c index d656ebd5f9d4614deab7668c2c091c8ab644c038..97fb2a40e6ba193efc51fa1cf0c05bb0815db648 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.c +++ b/virt/kvm/arm/vgic/vgic-mmio.c @@ -179,18 +179,6 @@ unsigned long vgic_mmio_read_pending(struct kvm_vcpu *vcpu, return value; } -/* - * This function will return the VCPU that performed the MMIO access and - * trapped from within the VM, and will return NULL if this is a userspace - * access. - * - * We can disable preemption locally around accessing the per-CPU variable, - * and use the resolved vcpu pointer after enabling preemption again, because - * even if the current thread is migrated to another CPU, reading the per-CPU - * value later will give us the same value as we update the per-CPU variable - * in the preempt notifier handlers. - */ - /* Must be called with irq->irq_lock held */ static void vgic_hw_irq_spending(struct kvm_vcpu *vcpu, struct vgic_irq *irq, bool is_uaccess) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 67ae2d5c37b238749aa153485d6bbbe855f8f108..70f03ce0e5c1d547beaa2d206ce6687f292a3b48 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4409,12 +4409,22 @@ static void kvm_sched_out(struct preempt_notifier *pn, /** * kvm_get_running_vcpu - get the vcpu running on the current CPU. - * Thanks to preempt notifiers, this can also be called from - * preemptible context. + * + * We can disable preemption locally around accessing the per-CPU variable, + * and use the resolved vcpu pointer after enabling preemption again, + * because even if the current thread is migrated to another CPU, reading + * the per-CPU value later will give us the same value as we update the + * per-CPU variable in the preempt notifier handlers. */ struct kvm_vcpu *kvm_get_running_vcpu(void) { - return __this_cpu_read(kvm_running_vcpu); + struct kvm_vcpu *vcpu; + + preempt_disable(); + vcpu = __this_cpu_read(kvm_running_vcpu); + preempt_enable(); + + return vcpu; } /**