From: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
To: Halil Pasic <pasic@linux.vnet.ibm.com>,
Pierre Morel <pmorel@linux.vnet.ibm.com>,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Cc: freude@de.ibm.com, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
cohuck@redhat.com, kwankhede@nvidia.com,
bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com,
alex.williamson@redhat.com, alifm@linux.vnet.ibm.com,
mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com,
thuth@redhat.com, berrange@redhat.com, fiuczy@linux.vnet.ibm.com,
buendgen@de.ibm.com
Subject: Re: [PATCH v3 04/14] KVM: s390: device attribute to set AP interpretive execution
Date: Mon, 2 Apr 2018 14:55:46 -0400 [thread overview]
Message-ID: <b781deb9-5fdc-1809-8e3c-3858e10aa944@linux.vnet.ibm.com> (raw)
In-Reply-To: <6c42b3e2-0f32-b84b-ea73-4e99157720d3@linux.vnet.ibm.com>
On 03/20/2018 06:48 PM, Halil Pasic wrote:
>
> On 03/20/2018 06:58 PM, Tony Krowiak wrote:
>> I spoke with Christian this morning and he made a suggestion which I think would provide the best solution here.
>> This is my proposal:
>> 1. Get rid of the KVM_S390_VM_CRYPTO_INTERPRET_AP device attribute and return to setting ECA.28 from the
>> mdev device open callback.
>> 2. Since there may be vcpus online at the time the mdev device open is called, we must first take all running vcpus out of
>> SIE and block them. Christian suggested the kvm_s390_vcpu_block_all(struct kvm *kvm) function will do the trick. So I
>> propose introducing a function like the following to be called during mdev open:
> There is one thing you missed, otherwise I'm *very* satisfied with this
> proposal.
>
> What you have missed IMHO is vcpu hottplug. So IMHO you should keep
> kvm->arch.crypto.apie, and update it accordingly ...
I agree, I will fix it.
>
>
>> int kvm_ap_set_interpretive_exec(struct kvm *kvm, bool enable)
>> {
>> int i;
>> struct kvm_vcpu *vcpu;
>>
>> if (!test_kvm_cpu_feat(kvm, KVM_S390_VM_CPU_FEAT_AP))
>> return -EOPNOTSUPP;
>>
>> mutex_lock(&kvm->lock);
>>
>> kvm_s390_vcpu_block_all(kvm);
> ... let's say here.
Yep
>
>> kvm_for_each_vcpu(i, vcpu, kvm) {
> And here you can call kvm_s390_vcpu_crypto_setup(vcpu) (the changes to
> this function will be required for hotplug) if you like
Sounds good to me.
>
>> if (enable)
>> vcpu->arch.sie_block->eca |= ECA_APIE;
>> else
>> vcpu->arch.sie_block->eca &= ~ECA_APIE;
> or keep this stuff, it does not really matter to me.
I'll call the kvm_s390_vcpu_crypto_setup(vcpu) to set ECA_APIE.
>
>> }
>>
>> kvm_s390_vcpu_unblock_all(kvm);
>>
>> mutex_unlock(&kvm->lock);
>>
>> return 0;
>> }
>>
>> This interface allows us to set ECA.28 even if vcpus are running
> I tend to agree. I will give it a proper review when this gets more
> formal (e.g. v4 (preferably) or patches to be fixed up to this series).
>
> Please don't forget to revisit the discussion on kvm_s390_vm_set_crypto:
> if the mechanism there isn't right for ECA.28 I think you should tell
> us why it's OK for the other attributes if it's OK. If it is not then
> I guess you will want to do a stand alone patch for that.
That will no longer be a part of this patch series. We can revisit that as
a separate issue at a future time.
>
next prev parent reply other threads:[~2018-04-02 18:56 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-14 18:25 [PATCH v3 00/14] s390: vfio-ap: guest dedicated crypto adapters Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 01/14] KVM: s390: refactor crypto initialization Tony Krowiak
2018-03-15 12:26 ` Pierre Morel
2018-03-15 14:48 ` Tony Krowiak
2018-03-15 14:55 ` Pierre Morel
2018-03-26 8:44 ` Cornelia Huck
2018-03-29 18:57 ` Tony Krowiak
2018-04-03 11:26 ` Cornelia Huck
2018-04-05 10:42 ` Christian Borntraeger
2018-04-05 10:45 ` Christian Borntraeger
2018-04-05 13:16 ` Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 02/14] s390: zcrypt: externalize AP instructions available function Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 03/14] KVM: s390: CPU model support for AP virtualization Tony Krowiak
2018-03-27 10:59 ` Cornelia Huck
2018-03-27 11:22 ` Pierre Morel
2018-03-27 11:30 ` Cornelia Huck
2018-03-14 18:25 ` [PATCH v3 04/14] KVM: s390: device attribute to set AP interpretive execution Tony Krowiak
2018-03-14 21:57 ` Halil Pasic
2018-03-15 13:00 ` Pierre Morel
2018-03-15 15:26 ` Tony Krowiak
2018-03-15 15:45 ` Pierre Morel
2018-03-15 17:21 ` Tony Krowiak
2018-03-15 17:56 ` Pierre Morel
2018-03-15 23:39 ` Tony Krowiak
2018-03-16 7:51 ` Pierre Morel
2018-03-16 16:09 ` Tony Krowiak
2018-03-20 17:58 ` Tony Krowiak
2018-03-20 22:48 ` Halil Pasic
2018-04-02 18:55 ` Tony Krowiak [this message]
2018-03-15 15:23 ` Tony Krowiak
2018-03-15 16:00 ` Pierre Morel
2018-03-15 23:37 ` Tony Krowiak
2018-03-15 16:25 ` Halil Pasic
2018-03-14 18:25 ` [PATCH v3 05/14] s390: vfio-ap: base implementation of VFIO AP device driver Tony Krowiak
2018-03-15 13:25 ` Pierre Morel
2018-03-15 17:25 ` Tony Krowiak
2018-03-27 11:17 ` Cornelia Huck
2018-03-27 14:45 ` Pierre Morel
2018-04-03 9:56 ` Cornelia Huck
2018-04-03 10:57 ` Cornelia Huck
2018-04-03 13:02 ` Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 06/14] s390: vfio-ap: register matrix device with VFIO mdev framework Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 07/14] KVM: s390: interfaces to configure/deconfigure guest's AP matrix Tony Krowiak
2018-04-03 11:07 ` Cornelia Huck
2018-04-03 13:17 ` Tony Krowiak
2018-04-03 13:38 ` Cornelia Huck
2018-03-14 18:25 ` [PATCH v3 08/14] s390: vfio-ap: sysfs interfaces to configure adapters Tony Krowiak
2018-04-03 11:10 ` Cornelia Huck
2018-04-03 13:33 ` Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 09/14] s390: vfio-ap: sysfs interfaces to configure domains Tony Krowiak
2018-04-03 11:17 ` Cornelia Huck
[not found] ` <1860430c-df59-6d58-77f9-b36c51595b4b@linux.vnet.ibm.com>
2018-04-03 15:19 ` Cornelia Huck
2018-04-03 15:42 ` Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 10/14] s390: vfio-ap: sysfs interfaces to configure control domains Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 11/14] s390: vfio-ap: sysfs interface to view matrix mdev matrix Tony Krowiak
2018-03-15 9:42 ` Pierre Morel
2018-03-15 14:52 ` Tony Krowiak
2018-03-15 15:35 ` Pierre Morel
2018-03-27 11:19 ` Cornelia Huck
2018-03-14 18:25 ` [PATCH v3 12/14] KVM: s390: configure the guest's AP devices Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 13/14] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 14/14] s390: doc: detailed specifications for AP virtualization Tony Krowiak
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