Re: [PATCH v13 17/35] KVM: Add transparent hugepage support for dedicated guest memory

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On 10/28/2023 2:21 AM, Sean Christopherson wrote:
Extended guest_memfd to allow backing guest memory with transparent hugepages. Require userspace to opt-in via a flag even though there's no known/anticipated use case for forcing small pages as THP is optional, i.e. to avoid ending up in a situation where userspace is unaware that KVM can't provide hugepages.

Personally, it seems not so "transparent" if requiring userspace to opt-in.

People need to 1) check if the kernel built with TRANSPARENT_HUGEPAGE support, or check is the sysfs of transparent hugepage exists; 2)get the maximum support hugepage size 3) ensure the size satisfies the alignment; before opt-in it.

Even simpler, userspace can blindly try to create guest memfd with transparent hugapage flag. If getting error, fallback to create without the transparent hugepage flag.

However, it doesn't look transparent to me.

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