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Re: [Xen-devel] [PATCH] x86/cpuid: Fix handling of the CPUID.7[0].eax levelling MSR


  • To: Jan Beulich <jbeulich@xxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 10 Sep 2019 11:26:30 +0100
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  • Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Tue, 10 Sep 2019 10:26:37 +0000
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On 10/09/2019 11:24, Jan Beulich wrote:
> On 09.09.2019 17:51, Andrew Cooper wrote:
>> --- a/xen/arch/x86/domctl.c
>> +++ b/xen/arch/x86/domctl.c
>> @@ -218,11 +218,16 @@ static int update_domain_cpuid_info(struct domain *d,
>>          if ( is_pv_domain(d) && ((levelling_caps & LCAP_7ab0) == LCAP_7ab0) 
>> )
>>          {
>>              uint64_t mask = cpuidmask_defaults._7ab0;
>> -            uint32_t eax = ctl->eax;
>> -            uint32_t ebx = p->feat._7b0;
>>  
>> -            if ( boot_cpu_data.x86_vendor & (X86_VENDOR_AMD | 
>> X86_VENDOR_HYGON) )
>> -                mask &= ((uint64_t)eax << 32) | ebx;
>> +            /*
>> +             * Leaf 7[0].eax is max_subleaf, not a feature mask.  Take it
>> +             * wholesale from the policy, but clamp the features in 7[0].ebx
>> +             * per usual.
>> +             */
>> +            if ( boot_cpu_data.x86_vendor &
>> +                 (X86_VENDOR_AMD | X86_VENDOR_HYGON) )
>> +                mask = (((uint64_t)p->feat.max_subleaf << 32) |
>> +                        ((uint32_t)mask | p->feat._7b0));
> Assuming you mean & instead of | here, with it fixed

Oops - I do.

> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

Thanks,

~Andrew

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