KVM: arm64: Provide the host_stage2_try() helper macro

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We currently unmap all MMIO mappings from the host stage-2 to recycle
the pages whenever we run out. In order to make this pattern easy to
re-use from other places, factor the logic out into a dedicated macro.
While at it, apply the macro for the kvm_pgtable_stage2_set_owner()
calls. They're currently only called early on and are guaranteed to
succeed, but making them robust to the -ENOMEM case doesn't hurt and
will avoid painful debugging sessions later on.

Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210809152448.1810400-4-qperret@google.com

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Quentin Perret 2021-08-09 16:24:30 +01:00 • committed by Marc Zyngier

parent 8e049e0daf

commit 1bac49d490

1 changed files with 22 additions and 18 deletions

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arch/arm64/kvm/hyp/nvhe/mem_protect.c

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