arm64: add HCRX_EL2 register
ClosedPublic
Actions

Authored by harry.moulton_arm.com on Jan 21 2025, 5:47 PM.

Details

Reviewers

andrew
manu

Group Reviewers

arm64

Commits

rG4d1acfb132a5: arm64: add HCRX_EL2 register

Summary

HCRX_EL2 is the Extended Hypervisor Configuration Register introduced
with FEAT_HCX in ARMv8.7. All fields in this register are used for
features in ARMv8.7 and above. Initially zero the register, incase
firmware has not properly configured it.

Sponsored By: Arm Ltd
Signed-off-by: Harry Moulton <harry.moulton@arm.com>

Diff Detail

Repository

rG FreeBSD src repository

Lint

Lint Skipped

Unit

Tests Skipped

Build Status

Buildable 61880
Build 58764: arc lint + arc unit

Event Timeline

harry.moulton_arm.com created this revision.Jan 21 2025, 5:47 PM

Herald added a reviewer: manu. · View Herald TranscriptJan 21 2025, 5:47 PM

Herald added subscribers: emaste, imp. · View Herald Transcript

harry.moulton_arm.com requested review of this revision.Jan 21 2025, 5:47 PM

Harbormaster completed remote builds in B61872: Diff 149676.Jan 21 2025, 5:47 PM

harry.moulton_arm.com added a child revision: D48584: arm64/vmm: save and restore HCRX_EL2 register.Jan 21 2025, 5:47 PM

andrew added inline comments.Jan 21 2025, 6:17 PM

sys/arm64/arm64/locore.S
378–390	Is there a reason to put this in a `VHE` only code path? It's also unlikely to need the `isb` as there is one before the `eret` that can be used as the context synchronization event.
sys/arm64/include/armreg.h
721–727 ↗	(On Diff #149676)	This should be in `hypervisor.h` as it's an EL2 only register.