releases/2.6.32.12/0008-KVM-Increase-NR_IOBUS_DEVS-limit-to-200.patch

   1 From f8dd49cc65898e9636df861e880aa6c94ab15ca5 Mon Sep 17 00:00:00 2001
   2 From: Sridhar Samudrala <sri@us.ibm.com>
   3 Date: Tue, 30 Mar 2010 16:48:25 -0700
   4 Subject: KVM: Increase NR_IOBUS_DEVS limit to 200
   5
   6 From: Sridhar Samudrala <sri@us.ibm.com>
   7
   8 (Cherry-picked from commit e80e2a60ff7914dae691345a976c80bbbff3ec74)
   9
  10 This patch increases the current hardcoded limit of NR_IOBUS_DEVS
  11 from 6 to 200. We are hitting this limit when creating a guest with more
  12 than 1 virtio-net device using vhost-net backend. Each virtio-net
  13 device requires 2 such devices to service notifications from rx/tx queues.
  14
  15 Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
  16 Signed-off-by: Avi Kivity <avi@redhat.com>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  18
  19 ---
  20  include/linux/kvm_host.h |    2 +-
  21  1 file changed, 1 insertion(+), 1 deletion(-)
  22
  23 --- a/include/linux/kvm_host.h
  24 +++ b/include/linux/kvm_host.h
  25 @@ -53,7 +53,7 @@ extern struct kmem_cache *kvm_vcpu_cache
  26   */
  27  struct kvm_io_bus {
  28         int                   dev_count;
  29 -#define NR_IOBUS_DEVS 6
  30 +#define NR_IOBUS_DEVS 200
  31         struct kvm_io_device *devs[NR_IOBUS_DEVS];
  32  };
  33