Differential D45528

arm64: Ensure sctlr and pstate are in known states
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Authored by andrew on Jun 7 2024, 2:25 PM.

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rGe70860e519df: arm64: Ensure sctlr and pstate are in known states
rG0fbb9df20dd8: arm64: Ensure sctlr and pstate are in known states
rG034c83fd7d85: arm64: Ensure sctlr and pstate are in known states

Summary

Before entering the kernel exception level ensure sctlr_el2 and
sctlr_el1 are in a known state. The EOS flag needs to be set to ensure
an eret instruction is a context synchronization event.

Set spcr_el1 when entering the kernel from EL1 and use an eret
instruction to return to the caller. This ensures the CPU pstate is
consistent with the value in spcr_el1 as it is the only way to set it
directly.

Sponsored by: Arm Ltd

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rG FreeBSD src repository

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Event Timeline

andrew created this revision.Jun 7 2024, 2:25 PM

Herald added a reviewer: manu. · View Herald TranscriptJun 7 2024, 2:25 PM

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

andrew requested review of this revision.Jun 7 2024, 2:25 PM

andrew added a parent revision: D45527: hwpmc/arm64: Support the kernel booting to VHE.

Harbormaster completed remote builds in B58101: Diff 139623.Jun 7 2024, 2:25 PM

andrew added a child revision: D45529: arm64: Support counter access with E2H.Jun 7 2024, 2:25 PM

Readd the isb at the end of enter_kernel_el. It seems to be needed.

Harbormaster completed remote builds in B58347: Diff 140226.Jun 25 2024, 4:27 PM

This revision was not accepted when it landed; it landed in state Needs Review.Jul 23 2024, 9:52 AM

Closed by commit rG034c83fd7d85: arm64: Ensure sctlr and pstate are in known states (authored by andrew). · Explain Why

This revision was automatically updated to reflect the committed changes.

andrew added a commit: rG034c83fd7d85: arm64: Ensure sctlr and pstate are in known states.

andrew added a commit: rG0fbb9df20dd8: arm64: Ensure sctlr and pstate are in known states.Sep 2 2024, 8:51 AM

andrew added a commit: rGe70860e519df: arm64: Ensure sctlr and pstate are in known states.Sep 2 2024, 9:13 AM

Revision Contents
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Path

Size

sys/

arm64/

arm64/

52 lines

include/

4 lines

Diff 141249

sys/arm64/arm64/locore.S

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sys/arm64/include/hypervisor.h

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