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. Each virtio-blk device needs 1 iobus device,
each virtio-net device requires 2 such devices to service
notifications (ioevent) from rx/tx queues. So it needs 512 io_bus
devices.
The maximum of coalesced mmio zone is 100, each zone has an iobus
devices.
pit, pic, ioapic don't use many kvm_io_bus devices. So increase
NR_IOBUS_DEVS limit to 700.
Signed-off-by: Amos Kong <akong@xxxxxxxxxx>
---
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 9698080..9933a0d 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -69,7 +69,7 @@ struct kvm_io_range {
struct kvm_io_bus {
int dev_count;
-#define NR_IOBUS_DEVS 300
+#define NR_IOBUS_DEVS 700
struct kvm_io_range range[NR_IOBUS_DEVS];
};
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