vmbase: Move stack to end of writable_data

Instead of imposing an arbitrary size for the stack, allows clients to
query a validated address range of a given size with boot_stack_range(),
which places the stack at the largest address possible, extending
downwards (common on AArch64).

Keep allocating 40 pages of stack in vmbase_example, rialto, and pvmfw.

Bug: 279209532
Bug: 270684188
Test: atest vmbase_example.integration_test
Test: atest rialto_test
Test: atest MicrodroidTests
Change-Id: If205ccd4fa408e32e5533b880a85f4cccbd3f005
Merged-In: If205ccd4fa408e32e5533b880a85f4cccbd3f005
8 files changed
tree: 50e89bb71d4545f00e27b245bcb9f647415e18ef
  1. apex/
  2. apkdmverity/
  3. authfs/
  4. compos/
  5. demo/
  6. docs/
  7. encryptedstore/
  8. javalib/
  9. launcher/
  10. libs/
  11. microdroid/
  12. microdroid_manager/
  13. pvmfw/
  14. rialto/
  15. tests/
  16. virtualizationmanager/
  17. virtualizationservice/
  18. vm/
  19. vm_payload/
  20. vmbase/
  21. vmclient/
  22. zipfuse/
  23. .clang-format
  24. .gitignore
  25. Android.bp
  26. OWNERS
  27. PREUPLOAD.cfg
  28. README.md
  29. TEST_MAPPING
README.md

Virtualization

This repository contains userspace services related to running virtual machines on Android, especially protected virtual machines. See the getting started documentation and Microdroid README for more information.