`kl-v2p`¶

Virtual to physical

Canonical: kernlens-v2p
Category: addresses & page tables
Synopsis: kl-v2p [-h] vaddr

Translates a virtual address to physical by consulting the live page tables, falling back to the direct-map arithmetic when the address is in the direct map.

Options¶

Option	Argument	Meaning
	—	virtual address to translate

A direct-map address¶

Invocation¶

kl-v2p 0xffff90c340400000

Output¶

Virtual: 0xffff90c340400000
Physical: 0x400000
page: 0xffffcd3b80010000
PFN: 1024  type: buddy
refcount: 0

Reading it¶

The result matches kl-p2v 0x400000 in reverse, which is the check that matters. Because a direct-map address's translation is exactly virt - page_offset_base, agreement here means the base is correct; disagreement means the slide or the base is wrong, not that the tables are.

Notes¶

For an address outside the direct map this must walk the tables, so it fails where kl-p2v cannot: an unmapped page has no physical address even though the arithmetic would produce one.

Part of the KernLens tutorial. Every output block on this page was captured from the kernel described in the tutorial index.

kl-v2p¶