Re: [PATCH v8 18/46] KVM: guest_memfd: Handle lru_add fbatch refcounts during conversion safety check
From: Sean Christopherson <seanjc@google.com>
Date: 2026-06-24 16:57:05
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kvm, linux-coco, linux-doc, linux-kselftest, linux-mm, lkml
On Thu, Jun 18, 2026, Ackerley Tng wrote:
When checking if a guest_memfd folio is safe for conversion, its refcount is examined. A folio may be present in a per-CPU lru_add fbatch, which temporarily increases its refcount.
Under what circumstances does this happen, and what alternatives are there for userspace to work around the issue?