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    SubjectRe: [PATCH v4 22/22] x86/fpu/xstate: Introduce boot-parameters to control state component support
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    On 2/21/21 12:10 PM, Bae, Chang Seok wrote:
    > On Feb 21, 2021, at 11:30, Randy Dunlap <rdunlap@infradead.org> wrote:
    >> Can we tell people (in this Doc file) where to look up the values that can be
    >> used in xstate.enable and xstate.disable?
    >
    > Perhaps add something like this with the change below:
    > “See comment before function fpu__init_parse_early_param() in
    > arch/x86/kernel/fpu/init.c."

    Hi,

    I was thinking more along the lines of where can I find the value
    0x60000 or BIT(22) or BIT(19), for example and see what they mean,
    even though it will likely be some abbreviation.


    > /*
    > * The kernel parameter "xstate.enable='mask'" and "xstate.disable='mask'" have a
    > * mask value in a subset of XFEATURE_MASK_CONFIGURABLE.
    > *
    > * The longest parameter is 22 octal number characters with '0' prefix and an extra
    > * '\0' for termination.
    > */
    > #define MAX_XSTATE_MASK_CHARS 24
    >
    > /**
    > * fpu__init_parse_early_param() - parse the xstate kernel parameters
    > *
    > * Parse them early because fpu__init_system() is executed before
    > * parse_early_param().
    > */
    > static void __init fpu__init_parse_early_param(void)

    thanks.
    --
    ~Randy

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