Re: [PATCH] x86: always store APIC ID of CPU

[Andrew Cooper <andrew.cooper3@citrix.com>]

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On 26/06/14 11:11, Jan Beulich wrote:
> So far for non-Intel CPUs struct cpuinfo_x86's apicid field didn't get
> set, despite MCE code consuming it.
>
> Do some formatting/ordering adjustment to the touched code at once.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
>
> --- a/xen/arch/x86/cpu/common.c
> +++ b/xen/arch/x86/cpu/common.c
> @@ -152,6 +152,17 @@ static void __cpuinit get_cpu_vendor(str
>  	this_cpu = &default_cpu;
>  }
>  
> +/*
> + * cpuid returns the value latched in the HW at reset, not the APIC ID
> + * register's value.  For any box whose BIOS changes APIC IDs, like
> + * clustered APIC systems, we must use hard_smp_processor_id.
> + *
> + * See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
> + */
> +static inline u32 phys_pkg_id(u32 cpuid_apic, int index_msb)

What is the point of the cpuid_apic parameter?  It is unused.

index_msb should probably be unsigned as it is used to shift with.

~Andrew

> +{
> +	return hard_smp_processor_id() >> index_msb;
> +}
>  
>  /* Do minimum CPU detection early.
>     Fields really needed: vendor, cpuid_level, family, model, mask, cache alignment.
> @@ -216,6 +227,7 @@ static void __cpuinit generic_identify(s
>  	if (c->x86 >= 0x6)
>  		c->x86_model += ((tfms >> 16) & 0xF) << 4;
>  	c->x86_mask = tfms & 15;
> +	c->apicid = phys_pkg_id((ebx >> 24) & 0xFF, 0);
>  	if ( cpu_has(c, X86_FEATURE_CLFLSH) )
>  		c->x86_clflush_size = ((ebx >> 8) & 0xff) * 8;
>  
> @@ -339,17 +351,6 @@ void __cpuinit identify_cpu(struct cpuin
>  	}
>  }
>  
> -/* cpuid returns the value latched in the HW at reset, not the APIC ID
> - * register's value.  For any box whose BIOS changes APIC IDs, like
> - * clustered APIC systems, we must use hard_smp_processor_id.
> - *
> - * See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
> - */
> -static inline u32 phys_pkg_id(u32 cpuid_apic, int index_msb)
> -{
> -	return hard_smp_processor_id() >> index_msb;
> -}
> -
>  /* leaf 0xb SMT level */
>  #define SMT_LEVEL       0
>  
> @@ -429,14 +430,12 @@ void __cpuinit detect_ht(struct cpuinfo_
>  	u32 	eax, ebx, ecx, edx;
>  	int 	index_msb, core_bits;
>  
> -	cpuid(1, &eax, &ebx, &ecx, &edx);
> -
> -	c->apicid = phys_pkg_id((ebx >> 24) & 0xFF, 0);
> -
> -	if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY)
> -        || cpu_has(c, X86_FEATURE_XTOPOLOGY))
> +	if (!cpu_has(c, X86_FEATURE_HT) ||
> +	    cpu_has(c, X86_FEATURE_CMP_LEGACY) ||
> +	    cpu_has(c, X86_FEATURE_XTOPOLOGY))
>  		return;
>  
> +	cpuid(1, &eax, &ebx, &ecx, &edx);
>  	c->x86_num_siblings = (ebx & 0xff0000) >> 16;
>  
>  	if (c->x86_num_siblings == 1) {
>
>
>
>
>
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> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel


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