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bdc7a6947d
Add a `mergeable` field to `MemoryZoneConfig` so that KSM page merging can be enabled selectively per memory zone rather than globally for all guest RAM. Previously, `MADV_MERGEABLE` was only controllable via the top-level `--memory mergeable=on` flag, which applied uniformly to all regions. With this change, users can leave boot memory unmerged while enabling KSM only on hotplug zones: --memory size=0,hotplug_method=virtio-mem --memory-zone id=boot,size=512M,shared=on,mergeable=off --memory-zone id=hotplug,size=256M,hotplug_size=1G,shared=off,mergeable=on The `MemoryZone` runtime struct now carries the `mergeable` flag so that both `allocate_address_space` and `add_ram_region` can apply per-zone `MADV_MERGEABLE` instead of the global `self.mergeable`. The top-level `--memory mergeable=on` path continues to work unchanged: the default zone is synthesised from `MemoryConfig` and inherits its `mergeable` value. AI/LLM disclosure: this patch was co-authored with GitHub Copilot and Claude Code (Opus 4.6). Signed-off-by: JP Kobryn <inwardvessel@gmail.com>