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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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imp

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andrew
manu
alc
markj
kib
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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

Diff Detail

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rG FreeBSD src repository
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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

sarah.walker2_arm.com updated this revision to Diff 176274.Apr 23 2026, 5:26 PM

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

PathSize
sys/
arm64/
arm64/
68 lines
10 lines
40 lines
conf/
1 line
vm/
8 lines

Diff 177688

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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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