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Differential D56599

arm64: VM/PMAP changes for CCA guest support
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Authored by sarah.walker2_arm.com on Apr 23 2026, 10:30 AM.

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Reviewers

andrew
manu
alc
markj
kib

Commits

rG56abdbc5f709: arm64: VM/PMAP changes for CCA guest support

Summary

When in a realm:

Mappings with mode VM_MEMATTR_DEVICE and VM_MEMATTR_DEVICE_NP are unprotected
Imported busdma buffers in protected memory are always bounced
If EARLY_PRINTK is in use, the UART physical address must be in the unprotected address space

Sponsored by: Arm Ltd

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rG FreeBSD src repository

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Tests Not Applicable

Event Timeline

sarah.walker2_arm.com created this revision.Apr 23 2026, 10:30 AM

Herald added a reviewer: andrew. · View Herald TranscriptApr 23 2026, 10:30 AM

Herald added a reviewer: andrew. · View Herald Transcript

Herald added a reviewer: manu. · View Herald Transcript

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

sarah.walker2_arm.com requested review of this revision.Apr 23 2026, 10:30 AM

Harbormaster completed remote builds in B72465: Diff 176244.Apr 23 2026, 10:30 AM

sarah.walker2_arm.com added a parent revision: D56598: arm64: Add RSI detection for CCA.Apr 23 2026, 10:30 AM

sarah.walker2_arm.com added a child revision: D56600: arm64: Load SOCDEV_PA as a literal rather than an immediate.

sarah.walker2_arm.com mentioned this in D56520: arm64: Add CCA guest support.Apr 23 2026, 10:31 AM

andrew added reviewers: alc, markj, kib.Apr 23 2026, 3:49 PM

andrew added inline comments.

sys/arm64/arm64/efirt_machdep.c
233	Needs to be on `pa` not page table entry
sys/arm64/arm64/pmap.c
4237
5454–5455	This should be applied to `pa` as it may be wrong under FEAT_LPA2
5774	Is this correct when entering a large page, e.g. when `psind == 2` a level 2 block will be created

Address review comments

Harbormaster completed remote builds in B72488: Diff 176274.Apr 23 2026, 5:26 PM

andrew accepted this revision.May 5 2026, 2:02 PM

This revision is now accepted and ready to land.May 5 2026, 2:02 PM

Closed by commit rG56abdbc5f709: arm64: VM/PMAP changes for CCA guest support (authored by sarah.walker2_arm.com, committed by andrew). · Explain WhyMay 12 2026, 4:56 PM

This revision was automatically updated to reflect the committed changes.

andrew added a commit: rG56abdbc5f709: arm64: VM/PMAP changes for CCA guest support.

Revision Contents
Changeset List

Path

Size

sys/

arm64/

arm64/

busdma_bounce.c

68 lines

efirt_machdep.c

10 lines

40 lines

conf/

1 line

vm/

8 lines

Diff 177688

sys/arm64/arm64/busdma_bounce.c

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sys/arm64/arm64/efirt_machdep.c

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sys/arm64/arm64/pmap.c

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sys/conf/files.arm64

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sys/vm/vm_page.c

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