arm64: KVM: Disable EL1 PTW when invalidating S2 TLBs

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When erratum 1319367 is being worked around, special care must
be taken not to allow the page table walker to populate TLBs
while we have the stage-2 translation enabled (which would otherwise
result in a bizare mix of the host S1 and the guest S2).

We enforce this by setting TCR_EL1.EPD{0,1} before restoring the S2
configuration, and clear the same bits after having disabled S2.

Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Marc Zyngier 2019-07-30 10:50:38 +01:00

parent 1d8cd06af5

commit 37553941c6

1 changed files with 23 additions and 0 deletions

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arch/arm64/kvm/hyp/tlb.c

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