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arm64/vmm: Add a feature flag and use it for HCRX
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Authored by andrew on Aug 8 2025, 12:20 PM.
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Details

Summary

Add a field to hold the features the hardware supports that need to be
handled when switching to a guest and use it to handle FEAT_HCX that
adds the HRX_EL2 register.

This reduces the number of times we read ID registers in guest
switching which may be trapped when running under nested virtualisation.

Sponsored by: Arm Ltd

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