Il 30/10/2013 12:39, Arthur Chunqi Li ha scritto: >> > >> > kvm_memory_slot just maps a host userspace address range to a guest >> > physical address range. Cooperation with Linux memory management is >> > done with the Linux MMU notifiers. MMU notifiers let KVM know that a >> > page has been swapped out, and KVM reacts by invalidating the shadow >> > page tables for the corresponding guest physical address. > So for each VM, qemu need to register its memory region and KVM stores > this region of GPA to HVA mapping in kvm_memory_slot, and at the first > page fault KVM uses EPT to map GPA to HPA. Am I right? Yes. > In this way, how is ballooning mechanism implemented in KVM memory > management module? Ballooning is done entirely in userspace with a madvise(MADV_DONTNEED) call on the HVA. The userspace has its own GPA->HVA mapping that is separate from the memslots (e.g. memory_region_find + memory_region_get_ram_ptr in QEMU). Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
