[PATCH 0/2] arm64: Workaround for Cortex-A55 erratum 1530923

[Steven Price]

This series enables a workaround for Cortex-A55 erratum 1530923. The
erratum potentially allows TLB entries to be allocated as a result of a
speculative AT instruction. This may happen in the middle of a guest
world switch while the relevant VMSA configuration is in an inconsistent
state, leading to erroneous content being allocated into TLBs.

The existing workaround for Cortex-A76 erratum 1165522 is the same, so
the first patch renames this workaround to a generic name
(SPECULATIVE_AT), the second patch then adds the detection for the
Cortex-A55 erratum 1530923.

Steven Price (2):
  arm64: Rename WORKAROUND_1165522 to SPECULATIVE_AT
  arm64: Workaround for Cortex-A55 erratum 1530923

 Documentation/arm64/silicon-errata.rst |  2 ++
 arch/arm64/Kconfig                     | 17 +++++++++++++++++
 arch/arm64/include/asm/cpucaps.h       |  2 +-
 arch/arm64/include/asm/kvm_host.h      |  2 +-
 arch/arm64/include/asm/kvm_hyp.h       |  7 +++----
 arch/arm64/kernel/cpu_errata.c         | 23 ++++++++++++++++++-----
 arch/arm64/kvm/hyp/switch.c            |  6 +++---
 arch/arm64/kvm/hyp/tlb.c               |  8 ++++----
 8 files changed, 49 insertions(+), 18 deletions(-)

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2.20.1