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Expose CPU features to AArch64 Linux guests via AT_HWCAP/AT_HWCAP2 - #1710
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🤖 SemverChecks 🤖 No breaking API changes detected Note: this does not mean API is unchanged, or even that there are no breaking changes; simply, none of the detections triggered. |
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This PR exposes CPU features to AArch64 Linux guests via
AT_HWCAP/AT_HWCAP2. Unlike on x86-64, AArch64 user code (EL0) cannot read the CPU's ID registers by itself and relies on these kernel-provided values. Currently, the Linux shim omits both, so guests' feature detection falls back to the baseline. A newArchSpecificProvider::get_guest_cpu_featureslets the platform report the CPU features whose state it preserves, and the shim filters out unsupported features.