Hi,
I'm trying to use ioeventfds for notification between guests. After
assigning a handful of ioeventfds I was getting a "no space left on
device error". The culprit seems to be that only 6 devices are
allowed for a guest on the kvm IO bus. The comment indicates a
somewhat low number was chosen. Can the limit be increased to
something on the order of the number of file descriptors a process
could have?
/*
* It would be nice to use something smarter than a linear search, TBD...
* Thankfully we dont expect many devices to register (famous last words :),
* so until then it will suffice. At least its abstracted so we can change
* in one place.
*/
struct kvm_io_bus {
int dev_count;
#define NR_IOBUS_DEVS 6
struct kvm_io_device *devs[NR_IOBUS_DEVS];
};
from kvm_main.c
int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
struct kvm_io_device *dev)
{
struct kvm_io_bus *new_bus, *bus;
bus = kvm->buses[bus_idx];
if (bus->dev_count > NR_IOBUS_DEVS-1)
return -ENOSPC;
...snip...
}
Thanks,
Cam
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