KVM: arm64: Add stand-alone page-table walker infrastructure

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The KVM page-table code is intricately tied into the kernel page-table
code and re-uses the pte/pmd/pud/p4d/pgd macros directly in an attempt
to reduce code duplication. Unfortunately, the reality is that there is
an awful lot of code required to make this work, and at the end of the
day you're limited to creating page-tables with the same configuration
as the host kernel. Furthermore, lifting the page-table code to run
directly at EL2 on a non-VHE system (as we plan to to do in future
patches) is practically impossible due to the number of dependencies it
has on the core kernel.

Introduce a framework for walking Armv8 page-tables configured
independently from the host kernel.

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20200911132529.19844-3-will@kernel.org

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Will Deacon 2020-09-11 14:25:10 +01:00 • committed by Marc Zyngier

parent 9af3e08baa

commit b1e57de62c

3 changed files with 390 additions and 1 deletions

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104

arch/arm64/include/asm/kvm_pgtable.h

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2

arch/arm64/kvm/hyp/Makefile

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285

arch/arm64/kvm/hyp/pgtable.c

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