The guest executes a memory access and the guest kernel’s page tables translate the guest virtual address to a Guest Physical Address. The CPU then walks the EPT/NPT to translate the Guest Physical Address to a Host Physical Address, but the page has no physical backing because we skipped the eager copy. So the CPU triggers a VM exit. KVM handles the VM exit and converts it to a host page fault on the corresponding address in the VMM’s mmap region. The host kernel sees the fault, checks the userfaultfd registration, suspends the vCPU thread, and writes a fault message to the uffd fd. The handler thread wakes up, computes the offset into the snapshot file, reads the page data, and calls UFFDIO_COPY. The kernel populates the page within the existing mapping and wakes the vCPU thread. The vCPU re-enters guest mode, the EPT/NPT walk succeeds this time, and the guest instruction completes.
Чемпионат мира 2026 года — Европейская зона|Финальная стадия. Полуфинальный раунд
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如今，从“要科学把握推进节奏与时序”到“推动新兴产业和未来产业形成集群化发展”，习近平对雄安新区的规划部署，同样体现了顺应形势变化、培育新发展优势的战略思考。。Line下载对此有专业解读
West: DEN | HOU | LAL | MIN | OKC | SAS。关于这个话题，Replica Rolex提供了深入分析