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From: Pierre Morel <pmorel@linux.ibm.com>
To: David Hildenbrand <david@redhat.com>, kvm@vger.kernel.org
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
	borntraeger@de.ibm.com, frankja@linux.ibm.com, cohuck@redhat.com,
	thuth@redhat.com, imbrenda@linux.ibm.com, hca@linux.ibm.com,
	gor@linux.ibm.com
Subject: Re: [PATCH v3 2/3] s390x: KVM: Implementation of Multiprocessor Topology-Change-Report
Date: Wed, 1 Sep 2021 11:46:02 +0200	[thread overview]
Message-ID: <98d3b4fb-f875-d833-2a75-5412cd426ec7@linux.ibm.com> (raw)
In-Reply-To: <4d462f11-2990-6799-75e5-add0c39f9563@redhat.com>



On 8/31/21 4:03 PM, David Hildenbrand wrote:
> On 03.08.21 10:26, Pierre Morel wrote:

...snip...


>> @@ -819,6 +820,23 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm, 
>> struct kvm_enable_cap *cap)
>>           icpt_operexc_on_all_vcpus(kvm);
>>           r = 0;
>>           break;
>> +    case KVM_CAP_S390_CPU_TOPOLOGY:
>> +        mutex_lock(&kvm->lock);
>> +        if (kvm->created_vcpus) {
>> +            r = -EBUSY;
>> +        } else {
>> +            set_kvm_facility(kvm->arch.model.fac_mask, 11);
>> +            set_kvm_facility(kvm->arch.model.fac_list, 11);
>> +            r = 0;
>> +        }
>> +        mutex_unlock(&kvm->lock);
>> +        VM_EVENT(kvm, 3, "ENABLE: CPU TOPOLOGY %s",
>> +             r ? "(not available)" : "(success)");
>> +        break;
>> +
>> +        r = -EINVAL;
>> +        break;
>> +
>>       default:
>>           r = -EINVAL;
>>           break;

This above enables the facility 11.

...snip...

>> @@ -3198,6 +3239,11 @@ static int kvm_s390_vcpu_setup(struct kvm_vcpu 
>> *vcpu)
>>           vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
>>       if (test_kvm_facility(vcpu->kvm, 9))
>>           vcpu->arch.sie_block->ecb |= ECB_SRSI;
>> +
>> +    /* PTF needs both host and guest facilities to enable 
>> interpretation */
>> +    if (test_kvm_facility(vcpu->kvm, 11) && test_facility(11))
>> +        vcpu->arch.sie_block->ecb |= ECB_PTF;
> 
> 
> Again, doesn't test_kvm_facility(vcpu->kvm, 11) imply that we have host 
> support by checking fac_mask?
> 

-- 
Pierre Morel
IBM Lab Boeblingen

  reply	other threads:[~2021-09-01  9:46 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-03  8:26 [PATCH v3 0/3] s390x: KVM: CPU Topology Pierre Morel
2021-08-03  8:26 ` [PATCH v3 1/3] s390x: KVM: accept STSI for CPU topology information Pierre Morel
2021-08-31 13:59   ` David Hildenbrand
2021-09-01  9:43     ` Pierre Morel
2021-09-06 18:14       ` David Hildenbrand
2021-09-07 10:11         ` Pierre Morel
2021-08-03  8:26 ` [PATCH v3 2/3] s390x: KVM: Implementation of Multiprocessor Topology-Change-Report Pierre Morel
2021-08-31 14:03   ` David Hildenbrand
2021-09-01  9:46     ` Pierre Morel [this message]
2021-09-06 18:37   ` David Hildenbrand
2021-09-07 10:24     ` Pierre Morel
2021-09-08  7:04       ` Christian Borntraeger
2021-09-08 12:00         ` Pierre Morel
2021-09-08 12:01           ` Christian Borntraeger
2021-09-08 12:52             ` Pierre Morel
2021-09-07 12:28     ` Pierre Morel
2021-09-08  7:07       ` Christian Borntraeger
2021-09-08 13:09         ` Pierre Morel
2021-09-08 13:16           ` Christian Borntraeger
2021-09-08 14:17             ` Pierre Morel
2021-09-09  9:03     ` Pierre Morel
2021-08-03  8:26 ` [PATCH v3 3/3] s390x: optimization of the check for CPU topology change Pierre Morel
2021-08-03  8:42   ` Heiko Carstens
2021-08-03  8:57     ` Pierre Morel
2021-08-03  9:28       ` Pierre Morel

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