KVM: arm64: ptdump: Flush the last region

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Currently the stage-2 ptdump calls note_page() at each leaf entry visit.
This simply misses the output of the last region, because note_page()
only dumps output when it detects a change in level/prot, or when the
walk enters a next marker section. The last region in the guest IPA
space with the same level/prot is not dumped since there is no change
after it.

Call note_page_flush() to dump the final region. note_page_flush()
uses ptdump_pg_state.end_address to call the final note_page(), so also
provide the end address.

Also change the second marker's start address to ULONG_MAX so we never
cross it. This avoids dumping redundant marker names (which are NULL),
and advancing beyond the end of the marker array.

Fixes: 7c4f73548e ("KVM: arm64: Register ptdump with debugfs on guest creation")
Reported-by: Sashiko AI <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/kvmarm/20260630122758.891011F00A3A@smtp.kernel.org/
Reviewed-by: Dev Jain <dev.jain@arm.com>
Tested-by: Dev Jain <dev.jain@arm.com>
Signed-off-by: Wei-Lin Chang <weilin.chang@arm.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>

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Wei-Lin Chang 2026-08-14 23:24:58 +01:00 • committed by Will Deacon

parent 902caade3c

commit beca1b97a2

1 changed files with 7 additions and 4 deletions

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arch/arm64/kvm/ptdump.c

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