Re: [Xen-devel] [PATCH v5 03/21] xen/x86: Generate deep dependencies of features

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.04.16 at 13:57, <andrew.cooper3@xxxxxxxxxx> wrote:
> +    deps = {
> +        # FPU is taken to mean support for the x87 regisers as well as the
> +        # instructions.  MMX is documented to alias the %MM registers over 
> the
> +        # x87 %ST registers in hardware.
> +        FPU: [MMX],
> +
> +        # The PSE36 feature indicates that reserved bits in a PSE superpage
> +        # may be used as extra physical address bits.
> +        PSE: [PSE36],
> +
> +        # Entering Long Mode requires that %CR4.PAE is set.  The NX and PKU
> +        # pagetable bits are only representable in the 64bit PTE format
> +        # offered by PAE.
> +        PAE: [LM, NX, PKU],

PKU is explicitly documented to be available only in IA-32e paging,
so I think it should be listed as a dependent of LM.

Jan


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