KVM: PPC: select IRQ_BYPASS_MANAGER

Select IRQ_BYPASS_MANAGER for PPC when CONFIG_KVM is set.
Add the PPC producer functions for add and del producer.

[paulus@ozlabs.org - Moved new functions from book3s.c to powerpc.c
 so booke compiles; added kvm_arch_has_irq_bypass implementation.]
Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

arch/powerpc/include/asm/kvm_ppc.h

@@ -287,6 +287,10 @@ struct kvmppc_ops {
 	long (*arch_vm_ioctl)(struct file *filp, unsigned int ioctl,
 			      unsigned long arg);
 	int (*hcall_implemented)(unsigned long hcall);
+	int (*irq_bypass_add_producer)(struct irq_bypass_consumer *,
+				       struct irq_bypass_producer *);
+	void (*irq_bypass_del_producer)(struct irq_bypass_consumer *,
+					struct irq_bypass_producer *);
 };
 
 extern struct kvmppc_ops *kvmppc_hv_ops;

arch/powerpc/kvm/Kconfig

@@ -23,6 +23,8 @@ config KVM
 	select HAVE_KVM_EVENTFD
 	select SRCU
 	select KVM_VFIO
+	select IRQ_BYPASS_MANAGER
+	select HAVE_KVM_IRQ_BYPASS
 
 config KVM_BOOK3S_HANDLER
 	bool

arch/powerpc/kvm/powerpc.c

@@ -27,6 +27,8 @@
 #include <linux/slab.h>
 #include <linux/file.h>
 #include <linux/module.h>
+#include <linux/irqbypass.h>
+#include <linux/kvm_irqfd.h>
 #include <asm/cputable.h>
 #include <asm/uaccess.h>
 #include <asm/kvm_ppc.h>
@@ -739,6 +741,42 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 #endif
 }
 
+/*
+ * irq_bypass_add_producer and irq_bypass_del_producer are only
+ * useful if the architecture supports PCI passthrough.
+ * irq_bypass_stop and irq_bypass_start are not needed and so
+ * kvm_ops are not defined for them.
+ */
+bool kvm_arch_has_irq_bypass(void)
+{
+	return ((kvmppc_hv_ops && kvmppc_hv_ops->irq_bypass_add_producer) ||
+		(kvmppc_pr_ops && kvmppc_pr_ops->irq_bypass_add_producer));
+}
+
+int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
+				     struct irq_bypass_producer *prod)
+{
+	struct kvm_kernel_irqfd *irqfd =
+		container_of(cons, struct kvm_kernel_irqfd, consumer);
+	struct kvm *kvm = irqfd->kvm;
+
+	if (kvm->arch.kvm_ops->irq_bypass_add_producer)
+		return kvm->arch.kvm_ops->irq_bypass_add_producer(cons, prod);
+
+	return 0;
+}
+
+void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
+				      struct irq_bypass_producer *prod)
+{
+	struct kvm_kernel_irqfd *irqfd =
+		container_of(cons, struct kvm_kernel_irqfd, consumer);
+	struct kvm *kvm = irqfd->kvm;
+
+	if (kvm->arch.kvm_ops->irq_bypass_del_producer)
+		kvm->arch.kvm_ops->irq_bypass_del_producer(cons, prod);
+}
+
 static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
                                       struct kvm_run *run)
 {