https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271330
Bug ID: 271330
Summary: struct vm_exit requires userland cpuset_t to be
MAXCPU-sized
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: ema...@freebsd.org
Blocks: 269572
In 76887e84be97 I increased the userland maximum size for cpuset_t to 1024
cores, but corvink reported it broke bhyve
> vmm kernel module and bhyve userland are sharing a cpuset_t. So, this
> commit introduces a mismatch in the ioctl signature of VM_RUN.
mjg adds:
> On one hand this really should not be a part of the abi (you could
> have a pointer to cpuset and a a var stating the size).
>
> On the other hand, i suspect the least problematic long term solution
> is to introduce usercpuset_t (or whatever the name) and have a
> conversion func on import. This would still mean you need a kernel and
> user variant of the vm_exit struct.
Referenced Bugs:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269572
[Bug 269572] MAXCPU too low for contemporary servers
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