KVM: Increase NR_IOBUS_DEVS limit to 200

This patch increases the current hardcoded limit of NR_IOBUS_DEVS
from 6 to 200. We are hitting this limit when creating a guest with more
than 1 virtio-net device using vhost-net backend. Each virtio-net
device requires 2 such devices to service notifications from rx/tx queues.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 9ad825e..169d077 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -54,7 +54,7 @@ extern struct kmem_cache *kvm_vcpu_cache;
  */
 struct kvm_io_bus {
        int                   dev_count;
  */
 struct kvm_io_bus {
        int                   dev_count;

-#define NR_IOBUS_DEVS 6
+#define NR_IOBUS_DEVS 200

        struct kvm_io_device *devs[NR_IOBUS_DEVS];
 };
 
        struct kvm_io_device *devs[NR_IOBUS_DEVS];
 };