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. One virtio-blk takes one iobus device,
one virtio-net(vhost=on) takes two iobus devices.
The maximum of coalesced mmio zone is 100, each zone
has an iobus devices. So 300 io_bus devices are not enough.
Set an upper bounds for kvm_io_range to limit userspace.
1000 is a very large limit and not bloat the typical user.
Signed-off-by: Amos Kong <ak...@redhat.com>
---
include/linux/kvm_host.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 9aff477..b0195d2 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -67,7 +67,7 @@ struct kvm_io_range {
struct kvm_io_device *dev;
};
-#define NR_IOBUS_DEVS 300
+#define NR_IOBUS_DEVS 1000
struct kvm_io_bus {
int dev_count;
--
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