CVSROOT: /cvs
Module name: src
Changes by: d...@cvs.openbsd.org 2021/09/13 16:16:28
Modified files:
sys/arch/amd64/amd64: vmm.c
sys/arch/amd64/include: vmmvar.h
Log message:
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@
