On Thu, Aug 10, 2017 at 02:08:38PM -0400, Konrad Rzeszutek Wilk wrote: > On Wed, Aug 09, 2017 at 11:58:20PM -0400, Lan Tianyu wrote: > > Intel Xeon phi chip will support 352 logical threads. For HPC > > usage case, it will create a huge VM with vcpus number as same as host > > cpus. This patch is to increase max vcpu number to 352. > > There is this ioctl called KVM_CAP_MAX_VCPUS. Why not use that? > > Oh wait, this is generic code. Perhaps there is a way to make > this more abstract? Where this information is provided via > an function to which various accelerators register?
We already check KVM_CAP_MAX_VCPUS, see kvm-all.c:kvm_init(). MachineClass::max_cpus is a limit defined at compile time, based on the limitations of the existing QEMU machine/device code. -- Eduardo
