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[PAL/Linux-SGX] Add AEX-Notify enabling code #2034

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[PAL/Linux-SGX] Add AEX-Notify enabling code #2034

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Commits on Oct 16, 2024

  1. [PAL/Linux-SGX] Add AEX-Notify enabling code 

    This is a preparatory commit for AEX-Notify support. This commit:
- Introduces the `sgx.experimental_enable_aex_notify` manifest option.
- Adds architectural flags/bits for SECS, TCS, SSA data structures.
- Adds a Gramine startup check whether AEX-Notify hardware feature is
  supported by the platform.
- Adds dynamic enablement/disablement of AEX-Notify feature per enclave
  thread (enable on thread creation, disable on thread termination).
  Currently per-thread enablement is commented out, as otherwise Gramine
  would segfault (as in-enclave code doesn't yet implement AEX-Notify).

Signed-off-by: Dmitrii Kuvaiskii <[email protected]>
    @dimakuv
    dimakuv committed Oct 16, 2024
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