john cooper wrote:
This patch from over a month ago doesn't seem to have made it into kvm-73 and may have been lost in the shuffle. Attached is essentially the same patch but as applied to kvm-73, and validated relative to that version.
I must have missed it. Thanks for persisting.
In a nutshell the intention here is to allow preallocation of guest huge page backed memory at qemu initialization time to avoid a quirk in the kernel's huge page accounting allowing overcommit of huge pages. Failure of the kernel to resolve a guest fault to overcommitted huge page memory during runtime results in sigkill termination of the guest. This patch provides the option of avoiding such behavior at the cost of up-front preallocation of physical huge pages backing the guest.
What is the motivation for providing an option to disable this? If we can detect mem-path is backed by huge pages somehow, I think we can prefault the memory unconditionally.
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