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Re: [PATCH CPU v1] cpuid: initialize cpuinfo with boot_cpu_data


  • To: Norbert Manthey <nmanthey@xxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Fri, 11 Feb 2022 11:34:57 +0100
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Fri, 11 Feb 2022 10:35:06 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 11.02.2022 08:23, Norbert Manthey wrote:
> --- a/xen/arch/x86/cpuid.c
> +++ b/xen/arch/x86/cpuid.c
> @@ -609,7 +609,7 @@ void __init init_guest_cpuid(void)
>  bool recheck_cpu_features(unsigned int cpu)
>  {
>      bool okay = true;
> -    struct cpuinfo_x86 c;
> +    struct cpuinfo_x86 c = boot_cpu_data;
>      const struct cpuinfo_x86 *bsp = &boot_cpu_data;
>      unsigned int i;

While I agree with the need to initialize the local variable, I
don't think it should be pre-seeded with previous indentification
results: This could end up hiding bugs. Instead I'd see it simply
be zero-filled.

Jan




 


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