kvm: arm64: Configure VTCR_EL2.SL0 per VM

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VTCR_EL2 holds the following key stage2 translation table
parameters:
  SL0  - Entry level in the page table lookup.
  T0SZ - Denotes the size of the memory addressed by the table.

We have been using fixed values for the SL0 depending on the
page size as we have a fixed IPA size. But since we are about
to make it dynamic, we need to calculate the SL0 at runtime
per VM. This patch adds a helper to compute the value of SL0
for a VM based on the IPA size.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <cdall@kernel.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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This commit is contained in:

Suzuki K Poulose 2018-09-26 17:32:48 +01:00 • committed by Marc Zyngier

parent 5955833064

commit 7e8130456e

2 changed files with 49 additions and 19 deletions

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69

arch/arm64/include/asm/kvm_arm.h

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1

arch/arm64/kvm/reset.c

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