KVM: arm64: Register ptdump with debugfs on guest creation

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While arch/*/mem/ptdump handles the kernel pagetable dumping code,
introduce KVM/ptdump to show the guest stage-2 pagetables. The
separation is necessary because most of the definitions from the
stage-2 pagetable reside in the KVM path and we will be invoking
functionality specific to KVM. Introduce the PTDUMP_STAGE2_DEBUGFS config.

When a guest is created, register a new file entry under the guest
debugfs dir which allows userspace to show the contents of the guest
stage-2 pagetables when accessed.

[maz: moved function prototypes from kvm_host.h to kvm_mmu.h]

Signed-off-by: Sebastian Ene <sebastianene@google.com>
Reviewed-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://lore.kernel.org/r/20240909124721.1672199-6-sebastianene@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Sebastian Ene 2024-09-09 12:47:21 +00:00 • committed by Marc Zyngier

parent 79c4c7284f

commit 7c4f73548e

5 changed files with 293 additions and 0 deletions

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6

arch/arm64/include/asm/kvm_mmu.h

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arch/arm64/kvm/Kconfig

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arch/arm64/kvm/Makefile

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arch/arm64/kvm/arm.c

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arch/arm64/kvm/ptdump.c

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