Re: [Qemu-devel] [PATCH] kvm: add detail error message when fail to add ioeventfd

[Amos Kong]

On Wed, May 22, 2013 at 11:32:27AM +0200, Stefan Hajnoczi wrote:
> On Wed, May 22, 2013 at 12:57:35PM +0800, Amos Kong wrote:
> > I try to hotplug 28 * 8 multiple-function devices to guest with
> > old host kernel, ioeventfds in host kernel will be exhausted, then
> > qemu fails to allocate ioeventfds for blk/nic devices.
> > 
> > It's better to add detail error here.
> > 
> > Signed-off-by: Amos Kong <address@hidden>
> > ---
> >  kvm-all.c |    4 ++++
> >  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> It would be nice to make kvm bus scalable so that the hardcoded
> in-kernel I/O device limit can be lifted.

I had increased kernel NR_IOBUS_DEVS to 1000 (a limitation is needed for
security) in last Mar, and make resizing kvm_io_range array dynamical.

> Reviewed-by: Stefan Hajnoczi <address@hidden>

-- 
                        Amos.