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Re: [Xen-devel] [PATCH 4/8] x86/AMD: distinguish compute units from hyper-threads


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 12 Jul 2018 14:02:57 +0100
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  • Cc: Brian Woods <brian.woods@xxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
  • Delivery-date: Thu, 12 Jul 2018 13:04:18 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 11/07/18 13:07, Jan Beulich wrote:
> Fam17 replaces CUs by HTs, which we should reflect accordingly, even if
> the difference is not very big. The most relevant change (requiring some
> code restructuring) is that the topoext feature no longer means there is
> a valid CU ID.
>
> Take the opportunity and convert wrongly plain int variables in
> set_cpu_sibling_map() to unsigned int.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> --- a/xen/arch/x86/cpu/amd.c
> +++ b/xen/arch/x86/cpu/amd.c
> @@ -504,17 +504,23 @@ static void amd_get_topology(struct cpui
>                  u32 eax, ebx, ecx, edx;
>  
>                  cpuid(0x8000001e, &eax, &ebx, &ecx, &edx);
> -                c->compute_unit_id = ebx & 0xFF;
>                  c->x86_num_siblings = ((ebx >> 8) & 0x3) + 1;
> +
> +             if (c->x86 < 0x17)
> +                     c->compute_unit_id = ebx & 0xFF;
> +             else {
> +                     c->cpu_core_id = ebx & 0xFF;
> +                     c->x86_max_cores /= c->x86_num_siblings;
> +             }

The indentation here is odd.  It turns out the function uses entirely
8-spaces rather than tabs, like the rest of the file.

Would you mind either retaining spaces, or fixing up the entire function
(probably easiest as a prereq patch) ?

Otherwise LGTM.

~Andrew

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