----- Original Message -----
> On 2012-02-29 14:30, Amos Kong wrote:
> > kvm_io_bus devices are used for ioevent, pit, pic, ioapic,
> > coalesced_mmio.
> >
> > Currently Qemu only emulates one PCI bus, it contains 32 slots,
> > one slot contains 8 functions, maximum of supported PCI devices:
> > 1 * 32 * 8 = 256. The maximum of coalesced mmio zone is 100,
> > each zone has an iobus devices. 300 io_bus devices is not enough.
> >
> > This patch makes the kvm_io_range array can be resized dynamically.
>
> Is there any limit, or can userspace allocate arbitrary amounts of
> kernel memory this way?
Hi Jan,
There is a fixed array in linux-2.6/include/linux/kvm_host.h,
we can only register 300 devices.
struct kvm_io_range {
gpa_t addr;
int len;
struct kvm_io_device *dev;
};
struct kvm_io_bus {
int dev_count;
#define NR_IOBUS_DEVS 300
struct kvm_io_range range[NR_IOBUS_DEVS];
};
^^^^^^^^^^^^^^
Amos.
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