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. There are existing workarounds for similar issues, 1165522 is effectively the same, and 1319367/1319537 is similar but without VHE support. Rather than add to the selection of errata, the first patch combines the existing errata into one workaround. The second patch then adds the detection for the Cortex-A55 erratum 1530923. Changes since v1: * Combine 1319367/1319537 into the same 'SPECULATIVE_AT' workaround. Steven Price (2): arm64: Combine workarounds for speculative AT errata arm64: Workaround for Cortex-A55 erratum 1530923 Documentation/arm64/silicon-errata.rst | 2 ++ arch/arm64/Kconfig | 18 ++++++++++++++++++ arch/arm64/include/asm/cpucaps.h | 5 ++--- arch/arm64/include/asm/kvm_host.h | 4 ---- arch/arm64/include/asm/kvm_hyp.h | 7 ++++--- arch/arm64/kernel/cpu_errata.c | 25 +++++++++++++++++++------ arch/arm64/kvm/hyp/switch.c | 10 +++++----- arch/arm64/kvm/hyp/sysreg-sr.c | 6 ++++-- arch/arm64/kvm/hyp/tlb.c | 12 ++++++------ 9 files changed, 60 insertions(+), 29 deletions(-) -- 2.20.1 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
