linux-kernel - [PATCH 0/5] arm64: Add workaround for Cortex-A77 erratum 1542418

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Date:   Thu, 14 Nov 2019 14:59:13 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, james.morse@....com, will@...nel.org,
        catalin.marinas@....com, mark.rutland@....com, maz@...nel.org,
        suzuki.poulose@....com
Subject: [PATCH 0/5] arm64: Add workaround for Cortex-A77 erratum 1542418

This series adds workaround for Arm erratum 1542418 which affects
Cortex-A77 cores (r0p0 - r1p0). Affected cores may execute stale
instructions from the L0 macro-op cache violating the
prefetch-speculation-protection guaranteed by the architecture.
This happens when the when the branch predictor bases its predictions
on a branch at this address on the stale history due to ASID or VMID
reuse.

The workaround is to invalidate the branch history before reusing
any ASID for a new address space. This is done by ensuring 60 ASIDs
are selected before any ASID is reused.

James Morse (5):
  arm64: Add MIDR encoding for Arm Cortex-A77
  arm64: mm: Workaround Cortex-A77 erratum 1542418 on ASID rollover
  arm64: Workaround Cortex-A77 erratum 1542418 on boot due to kexec
  KVM: arm64: Workaround Cortex-A77 erratum 1542418 on VMID rollover
  KVM: arm/arm64: Don't invoke defacto-CnP on first run

 Documentation/arm64/silicon-errata.rst |  2 +
 arch/arm/include/asm/kvm_mmu.h         |  5 ++
 arch/arm64/Kconfig                     | 16 ++++++
 arch/arm64/include/asm/cpucaps.h       |  3 +-
 arch/arm64/include/asm/cputype.h       |  2 +
 arch/arm64/include/asm/kvm_mmu.h       | 15 ++++++
 arch/arm64/include/asm/mmu_context.h   |  1 +
 arch/arm64/kernel/cpu_errata.c         | 21 ++++++++
 arch/arm64/mm/context.c                | 73 +++++++++++++++++++++++++-
 virt/kvm/arm/arm.c                     | 23 +++++---
 10 files changed, 151 insertions(+), 10 deletions(-)

-- 
2.23.0