Version 4 fixes a silly mistake in the final patch. 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 renames 1165522 to WORKAROUND_SPECULATIVE_AT which can be reused (in the final patch) for 1530923. The workaround for errata 1319367 and 1319537 although similar cannot use VHE (not available on those CPUs) so cannot share the workaround. However, to keep some sense of symmetry the workaround is renamed to SPECULATIVE_AT_NVHE. Changes since v3: * Added Suzuki's reviewed-bys - thanks! * Corrected ARM64_WORKAROUND_SPECULATIVE_AT to ARM64_WORKAROUND_SPECULATIVE_AT_VHE in the final patch Changes since v2: * Split 1319367/1319537 back into their own workaround, but rename it for symmetry with the VHE workaround. Changes since v1: * Combine 1319367/1319537 into the same 'SPECULATIVE_AT' workaround. Steven Price (3): arm64: Rename WORKAROUND_1165522 to SPECULATIVE_AT_VHE arm64: Rename WORKAROUND_1319367 to SPECULATIVE_AT_NVHE arm64: Workaround for Cortex-A55 erratum 1530923 Documentation/arm64/silicon-errata.rst | 2 ++ arch/arm64/Kconfig | 21 +++++++++++++++++++++ arch/arm64/include/asm/cpucaps.h | 4 ++-- arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/include/asm/kvm_hyp.h | 6 +++--- arch/arm64/kernel/cpu_errata.c | 25 +++++++++++++++++++------ arch/arm64/kvm/hyp/switch.c | 10 +++++----- arch/arm64/kvm/hyp/sysreg-sr.c | 4 ++-- arch/arm64/kvm/hyp/tlb.c | 12 ++++++------ 9 files changed, 61 insertions(+), 25 deletions(-) -- 2.20.1 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
