From: Amos Kong Date: Fri, 9 Mar 2012 04:17:40 +0000 (+0800) Subject: KVM: set upper bounds for iobus dev to limit userspace X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=786a9f888bfbe70a36d0592b26037ca1e8c8da7f;p=linux-beck.git KVM: set upper bounds for iobus dev to limit userspace 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 Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index ba9fb4a9762d..3a2cea616283 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -68,7 +68,7 @@ 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;