On 2023-06-13 19:21, Sean Christopherson wrote:
On Thu, 01 Jun 2023 17:58:59 -0700, Sean Christopherson wrote:
Add a "never" option to the nx_huge_pages module param to allow userspace
to do a one-way hard disabling of the mitigation, and don't create the
per-VM recovery threads when the mitigation is hard disabled. Letting
userspace pinky swear that userspace doesn't want to enable NX mitigation
(without reloading KVM) allows certain use cases to avoid the latency
problems associated with spawning a kthread for each VM.
[...]
Applied to kvm-x86 mmu. I kept the default as "auto" for now, as that can go on
top and I don't want to introduce that change this late in the cycle. If no one
beats me to the punch (hint, hint ;-) ), I'll post a patch to make "never" the
default for unaffected hosts so that we can discuss/consider that change for 6.6.
Thanks Sean, I agree with the plan. I could give a try on the patch if you'd like.
- Luiz
Thanks for the reviews!
[1/1] KVM: x86/mmu: Add "never" option to allow sticky disabling of nx_huge_pages
https://github.com/kvm-x86/linux/commit/0b210faf3373
--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes
