• Mark Rutland's avatar
    arm64: sanity checks: ignore ID_MMFR0.AuxReg · 9760270c
    Mark Rutland authored
    It seems that Cortex-A53 r0p4 added support for AIFSR and ADFSR, and
    ID_MMFR0.AuxReg has been updated accordingly to report this fact. As
    Cortex-A53 could be paired with CPUs which do not implement these
    registers (e.g. all current revisions of Cortex-A57), this may trigger a
    sanity check failure at boot.
    The AuxReg value describes the availability of the ACTLR, AIFSR, and
    ADFSR registers, which are only of use to 32-bit guest OSs, and have
    IMPLEMENTATION DEFINED contents. Given the nature of these registers it
    is likely that KVM will need to trap accesses regardless of whether the
    CPUs are heterogeneous.
    This patch masks out the ID_MMFR0.AuxReg value from the sanity checks,
    preventing spurious warnings at boot time.
    Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
    Reported-by: default avatarAndre Przywara <andre.przywara@arm.com>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Acked-by: default avatarWill Deacon <will.deacon@arm.com>
    Cc: Marc Zyngier <marc.zyngier@arm.com>
    Cc: Peter Maydell <peter.maydell@linaro.org>
    Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
cpuinfo.c 6.87 KB