refine: Reinfe mm init

[junyu0312]

Summary by CodeRabbit

• Refactor

  • Simplified virtual machine memory initialization and region management processes.
  • Streamlined memory address space configuration by updating internal handling mechanisms.
  • Reduced memory layout dependency complexity.

• Tests

  • Updated memory management tests to reflect refactored initialization patterns.

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📥 Commits

Reviewing files that changed from the base of the PR and between f10f45a and bfffc9f.

📒 Files selected for processing (7)

• crates/vm-core/src/virt.rs
• crates/vm-core/src/virt/hvp.rs
• crates/vm-core/src/virt/kvm.rs
• crates/vm-core/src/virt/kvm/vcpu/arch/x86_64.rs
• crates/vm-machine/src/vm_builder.rs
• crates/vm-mm/src/manager.rs
• crates/vm-mm/src/region.rs

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