linux-kernel - Re: [PATCH v2 13/15] KVM: s390: Configure the guest's CRYCB

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Date:   Wed, 28 Feb 2018 10:49:34 +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 13/15] KVM: s390: Configure the guest's CRYCB


> +static int vfio_ap_mdev_open(struct mdev_device *mdev)
> +{
> +	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
> +	unsigned long events;
> +	int ret;
> +
> +	matrix_mdev->group_notifier.notifier_call = vfio_ap_mdev_group_notifier;
> +	events = VFIO_GROUP_NOTIFY_SET_KVM;
> +	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
> +				     &events, &matrix_mdev->group_notifier);
> +
> +	ret = kvm_ap_configure_matrix(matrix_mdev->kvm,
> +				      matrix_mdev->matrix);
> +	if (ret)
> +		return ret;
> +
> +	ret = kvm_ap_enable_ie_mode(matrix_mdev->kvm);

Can't this happen while the guest is already running? Or what hinders us
from doing that?

> +
> +	return ret;
> +}
> +
> +static void vfio_ap_mdev_release(struct mdev_device *mdev)

Thanks,

David / dhildenb