linux-kernel - Re: [PATCH v2 08/15] KVM: s390: interface to enable AP execution mode

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Message-ID: <dcb6e922-6349-9932-c9be-ff8581ba0259@redhat.com>
Date:   Thu, 1 Mar 2018 10:32:12 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, fiuczy@...ux.vnet.ibm.com,
        buendgen@...ibm.com
Subject: Re: [PATCH v2 08/15] KVM: s390: interface to enable AP execution mode


>>> +EXPORT_SYMBOL(kvm_ap_enable_ie_mode);
>>> diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
>>> index 1b5621f..3142541 100644
>>> --- a/arch/s390/kvm/kvm-s390.h
>>> +++ b/arch/s390/kvm/kvm-s390.h
>>> @@ -18,6 +18,7 @@
>>>   #include <asm/facility.h>
>>>   #include <asm/processor.h>
>>>   #include <asm/sclp.h>
>>> +#include <asm/ap.h>
>>>   
>>>   /* Transactional Memory Execution related macros */
>>>   #define IS_TE_ENABLED(vcpu)	((vcpu->arch.sie_block->ecb & ECB_TE))
>>>
>> What about VSIE?
> That is a good question. I'm beginning to think introducing AP on second 
> level guests
> ought to be postponed for now. I'm going to look into this further.
>>

Once you provide AP support to the guest, vSIE also has to be in place.

But don't worry about vSIE, I think I know what we have to do.

-- 

Thanks,

David / dhildenb