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    SubjectRe: Reading /dev/mem by dd
    On Thu, Nov 12, 2009 at 10:07:22PM +0100, Krzysztof Halasa wrote:
    > "Henrique de Moraes Holschuh" <hmh@hmh.eng.br> writes:
    >
    > > In this case, the problem seems to be access over /dev/mem to stuff the
    > > kernel is already taking care of.
    >
    > Not sure if local APIC counts as "PCI space and the BIOS code and data
    > regions" but:
    >
    > $ grep STRICT_DEVMEM -A 15 arch/x86/Kconfig.debug
    > config STRICT_DEVMEM
    > bool "Filter access to /dev/mem"
    > ---help---
    >

    Yes, having this option turned on an access to LAPIC/IO_APIC
    space will be forbidden.

    -- Cyrill


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