KVM: arm64: nv: Invalidate TLBs based on shadow S2 TTL-like information

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In order to be able to make S2 TLB invalidations more performant on NV,
let's use a scheme derived from the FEAT_TTL extension.

If bits [56:55] in the leaf descriptor translating the address in the
corresponding shadow S2 are non-zero, they indicate a level which can
be used as an invalidation range. This allows further reduction of the
systematic over-invalidation that takes place otherwise.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240614144552.2773592-14-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Marc Zyngier 2024-06-14 15:45:49 +01:00 • committed by Oliver Upton

parent b1a3a94812

commit 809b2e6013

1 changed files with 84 additions and 1 deletions

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arch/arm64/kvm/nested.c

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