On Wed, Mar 16 2022 at 05:08, Kirill A. Shutemov wrote:
> +
> +static void get_info(unsigned int *gpa_width)
get_info() is really not a descriptive function name. Also why does this
need a pointer and does not return gpa_width?
>
> setup_force_cpu_cap(X86_FEATURE_TDX_GUEST);
>
> + get_info(&gpa_width);
> +
> + cc_set_vendor(CC_VENDOR_INTEL);
> +
> + /*
> + * The highest bit of a guest physical address is the "sharing" bit.
> + * Set it for shared pages and clear it for private pages.
> + */
> + cc_set_mask(BIT_ULL(gpa_width - 1));
The code ordering here is silly:
1) Retrieve gpa width
2) Set CC vendor
3) Use gpa width
static u64 get_cc_mask(void)
{
gpa_width = magic();
/*
* Comment explaining the return value
*/
return BIT_ULL(gpa_width - 1);
}
and
cc_set_vendor(CC_VENDOR_INTEL);
cc_set_mask(get_cc_mask());
would be too intuitive, right?
Thanks,
tglx
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