From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: mark.rutland@arm.com, suzuki.poulose@arm.com, maz@kernel.org,
linux-kernel@vger.kernel.org, james.morse@arm.com,
catalin.marinas@arm.com, will@kernel.org
Subject: [PATCH 0/5] arm64: Add workaround for Cortex-A77 erratum 1542418
Date: Thu, 14 Nov 2019 14:59:13 +0000 [thread overview]
Message-ID: <20191114145918.235339-1-suzuki.poulose@arm.com> (raw)
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
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next reply other threads:[~2019-11-14 15:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-14 14:59 Suzuki K Poulose [this message]
2019-11-14 14:59 ` [PATCH 1/5] arm64: Add MIDR encoding for Arm Cortex-A77 Suzuki K Poulose
2019-11-14 14:59 ` [PATCH 2/5] arm64: mm: Workaround Cortex-A77 erratum 1542418 on ASID rollover Suzuki K Poulose
2019-11-14 14:59 ` [PATCH 3/5] arm64: Workaround Cortex-A77 erratum 1542418 on boot due to kexec Suzuki K Poulose
2019-11-14 14:59 ` [PATCH 4/5] KVM: arm64: Workaround Cortex-A77 erratum 1542418 on VMID rollover Suzuki K Poulose
2019-11-14 14:59 ` [PATCH 5/5] KVM: arm/arm64: Don't invoke defacto-CnP on first run Suzuki K Poulose
2019-11-14 16:39 ` [PATCH 0/5] arm64: Add workaround for Cortex-A77 erratum 1542418 Will Deacon
2019-11-15 1:14 ` Suzuki K Poulose
2019-11-20 19:18 ` Will Deacon
2020-04-08 10:09 ` Will Deacon
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