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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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