vmm(4): add limit to number of vcpus
After fixing previous syzbot issues related to lock contention, the reproducer code managed to hit an issue where it can exhaust kernel memory by allocating vcpus. Since each vcpu (regardless if it's SVM or VMX-capable) requires wiring some number of pages of memory, it was possible to starve other parts of the kernel.
This change limits the total number of vcpus to 512, a conservative number given vmm(4) only supports single vcpu guests at the moment.
ok mlarkin@
projects / openbsd / commit