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Re: [Xen-devel] [PATCH v2] x86/amd: Avoid cpu_has_hypervisor evaluating true on native hardware


  • To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Tue, 11 Feb 2020 16:41:39 +0000
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  • Cc: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>, Claudia <claudia1@xxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Tue, 11 Feb 2020 16:41:52 +0000
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On 11/02/2020 16:31, Roger Pau Monné wrote:
> On Tue, Feb 11, 2020 at 03:51:54PM +0000, Andrew Cooper wrote:
>> diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
>> index 4fa9c91140..ce76d6d776 100644
>> --- a/xen/arch/x86/domctl.c
>> +++ b/xen/arch/x86/domctl.c
>> @@ -48,7 +48,7 @@ static int gdbsx_guest_mem_io(domid_t domid, struct 
>> xen_domctl_gdbsx_memio *iop)
>>  }
>>  #endif
>>  
>> -static void domain_cpu_policy_changed(struct domain *d)
>> +void domain_cpu_policy_changed(struct domain *d)
>>  {
>>      const struct cpuid_policy *p = d->arch.cpuid;
>>      struct vcpu *v;
>> @@ -106,6 +106,13 @@ static void domain_cpu_policy_changed(struct domain *d)
>>                      ecx = 0;
>>                  edx = cpufeat_mask(X86_FEATURE_APIC);
>>  
>> +                /*
>> +                 * If the Hypervisor bit is set in the policy, we can also
>> +                 * forward it into real CPUID.
>> +                 */
>> +                if ( p->basic.hypervisor )
>> +                    ecx |= cpufeat_mask(X86_FEATURE_HYPERVISOR);
> AFAICT dom0 will also get the hypervisor bit set by default, as that's
> part of both the HVM and the PV max policy?

Correct.

>
> If so:
>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Thanks.

~Andrew

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