KVM: Add KVM_IRQCHIP_NUM_PINS in addition to KVM_IOAPIC_NUM_PINS

The concept of routing interrupt lines to an irqchip is nothing
that is IOAPIC specific. Every irqchip has a maximum number of pins
that can be linked to irq lines.

So let's add a new define that allows us to reuse generic code for
non-IOAPIC platforms.
Signed-off-by: Alexander Graf <agraf@suse.de>
Acked-by: Michael S. Tsirkin <mst@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -43,6 +43,8 @@
 #define KVM_PIO_PAGE_OFFSET 1
 #define KVM_COALESCED_MMIO_PAGE_OFFSET 2
 
+#define KVM_IRQCHIP_NUM_PINS  KVM_IOAPIC_NUM_PINS
+
 #define CR0_RESERVED_BITS                                               \
 	(~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
 			  | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \

include/linux/kvm_host.h

@@ -307,7 +307,7 @@ struct kvm_kernel_irq_routing_entry {
 #ifdef __KVM_HAVE_IOAPIC
 
 struct kvm_irq_routing_table {
-	int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
+	int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
 	struct kvm_kernel_irq_routing_entry *rt_entries;
 	u32 nr_rt_entries;
 	/*

virt/kvm/irq_comm.c

@@ -480,7 +480,7 @@ int kvm_set_irq_routing(struct kvm *kvm,
 
 	new->nr_rt_entries = nr_rt_entries;
 	for (i = 0; i < 3; i++)
-		for (j = 0; j < KVM_IOAPIC_NUM_PINS; j++)
+		for (j = 0; j < KVM_IRQCHIP_NUM_PINS; j++)
 			new->chip[i][j] = -1;
 
 	for (i = 0; i < nr; ++i) {