From: Tony Krowiak <akrowiak@linux.ibm.com>
To: Halil Pasic <pasic@linux.ibm.com>
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, freude@linux.ibm.com,
borntraeger@de.ibm.com, cohuck@redhat.com,
mjrosato@linux.ibm.com, alex.williamson@redhat.com,
kwankhede@nvidia.com, fiuczy@linux.ibm.com,
frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com,
hca@linux.ibm.com, gor@linux.ibm.com
Subject: Re: [PATCH v10 10/16] s390/vfio-ap: allow configuration of matrix mdev in use by a KVM guest
Date: Wed, 30 Sep 2020 09:19:50 -0400 [thread overview]
Message-ID: <d854afee-51bc-997b-26fc-72b9560f3a0f@linux.ibm.com> (raw)
In-Reply-To: <20200927020316.38bf3fa1.pasic@linux.ibm.com>
On 9/26/20 8:03 PM, Halil Pasic wrote:
> On Fri, 21 Aug 2020 15:56:10 -0400
> Tony Krowiak <akrowiak@linux.ibm.com> wrote:
>
>> The current support for pass-through crypto adapters does not allow
>> configuration of a matrix mdev when it is in use by a KVM guest. Let's
>> allow AP resources - i.e., adapters, domains and control domains - to be
>> assigned to or unassigned from a matrix mdev while it is in use by a guest.
>> This is in preparation for the introduction of support for dynamic
>> configuration of the AP matrix for a running KVM guest.
> AFAIU this will let the user do the assign, which will however only take
> effect if the same mdev is re-used with a freshly constructed VM, or?
>
> This is however supposed to change real soon (in patch 11). From the
> perspective of bisectability we would end up with a single commit that
> acts funny.
>
> How about switching up patches 10 and 11. This way the changes you have
> in the current 11 would remain dormant until the changes in the current
> 10 enable the complete new feature (hotplug)?
I can do that, but maybe it makes more sense to squash patches 10
and 11 since they are completely dependent on each other. What say
you?
>
>
>> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
>> ---
>> drivers/s390/crypto/vfio_ap_ops.c | 24 ------------------------
>> 1 file changed, 24 deletions(-)
>>
>> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
>> index 24fd47e43b80..cf3321eb239b 100644
>> --- a/drivers/s390/crypto/vfio_ap_ops.c
>> +++ b/drivers/s390/crypto/vfio_ap_ops.c
>> @@ -773,10 +773,6 @@ static ssize_t assign_adapter_store(struct device *dev,
>> struct mdev_device *mdev = mdev_from_dev(dev);
>> struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
>>
>> - /* If the guest is running, disallow assignment of adapter */
>> - if (matrix_mdev->kvm)
>> - return -EBUSY;
>> -
>> ret = kstrtoul(buf, 0, &apid);
>> if (ret)
>> return ret;
>> @@ -828,10 +824,6 @@ static ssize_t unassign_adapter_store(struct device *dev,
>> struct mdev_device *mdev = mdev_from_dev(dev);
>> struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
>>
>> - /* If the guest is running, disallow un-assignment of adapter */
>> - if (matrix_mdev->kvm)
>> - return -EBUSY;
>> -
>> ret = kstrtoul(buf, 0, &apid);
>> if (ret)
>> return ret;
>> @@ -891,10 +883,6 @@ static ssize_t assign_domain_store(struct device *dev,
>> struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
>> unsigned long max_apqi = matrix_mdev->matrix.aqm_max;
>>
>> - /* If the guest is running, disallow assignment of domain */
>> - if (matrix_mdev->kvm)
>> - return -EBUSY;
>> -
>> ret = kstrtoul(buf, 0, &apqi);
>> if (ret)
>> return ret;
>> @@ -946,10 +934,6 @@ static ssize_t unassign_domain_store(struct device *dev,
>> struct mdev_device *mdev = mdev_from_dev(dev);
>> struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
>>
>> - /* If the guest is running, disallow un-assignment of domain */
>> - if (matrix_mdev->kvm)
>> - return -EBUSY;
>> -
>> ret = kstrtoul(buf, 0, &apqi);
>> if (ret)
>> return ret;
>> @@ -991,10 +975,6 @@ static ssize_t assign_control_domain_store(struct device *dev,
>> struct mdev_device *mdev = mdev_from_dev(dev);
>> struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
>>
>> - /* If the guest is running, disallow assignment of control domain */
>> - if (matrix_mdev->kvm)
>> - return -EBUSY;
>> -
>> ret = kstrtoul(buf, 0, &id);
>> if (ret)
>> return ret;
>> @@ -1036,10 +1016,6 @@ static ssize_t unassign_control_domain_store(struct device *dev,
>> struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
>> unsigned long max_domid = matrix_mdev->matrix.adm_max;
>>
>> - /* If the guest is running, disallow un-assignment of control domain */
>> - if (matrix_mdev->kvm)
>> - return -EBUSY;
>> -
>> ret = kstrtoul(buf, 0, &domid);
>> if (ret)
>> return ret;
next prev parent reply other threads:[~2020-09-30 13:20 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 19:56 [PATCH v10 00/16] s390/vfio-ap: dynamic configuration support Tony Krowiak
2020-08-21 19:56 ` [PATCH v10 01/16] s390/vfio-ap: add version vfio_ap module Tony Krowiak
2020-08-25 10:04 ` Cornelia Huck
2020-08-26 14:49 ` Tony Krowiak
2020-08-27 10:32 ` Cornelia Huck
2020-08-27 14:39 ` Tony Krowiak
2020-08-28 8:10 ` Cornelia Huck
2020-08-21 19:56 ` [PATCH v10 02/16] s390/vfio-ap: use new AP bus interface to search for queue devices Tony Krowiak
2020-08-25 10:13 ` Cornelia Huck
2020-08-27 14:24 ` Tony Krowiak
2020-08-28 8:13 ` Cornelia Huck
2020-08-28 15:10 ` Tony Krowiak
2020-09-25 2:11 ` Halil Pasic
2020-10-16 20:59 ` Tony Krowiak
2020-09-04 8:11 ` Christian Borntraeger
2020-09-08 18:54 ` Tony Krowiak
2020-09-25 2:27 ` Halil Pasic
2020-09-29 13:07 ` Tony Krowiak
2020-09-29 13:37 ` Halil Pasic
2020-09-29 20:57 ` Tony Krowiak
2020-08-21 19:56 ` [PATCH v10 03/16] s390/vfio-ap: manage link between queue struct and matrix mdev Tony Krowiak
2020-08-25 10:25 ` Cornelia Huck
2020-08-28 23:05 ` Tony Krowiak
2020-09-04 8:15 ` Christian Borntraeger
2020-09-08 19:03 ` Tony Krowiak
2020-09-25 7:58 ` Halil Pasic
2020-08-21 19:56 ` [PATCH v10 04/16] s390/zcrypt: driver callback to indicate resource in use Tony Krowiak
2020-09-14 15:29 ` Cornelia Huck
2020-09-15 19:32 ` Tony Krowiak
2020-09-17 12:14 ` Cornelia Huck
2020-09-17 13:54 ` Tony Krowiak
2020-09-25 9:24 ` Halil Pasic
2020-09-29 13:59 ` Tony Krowiak
2020-08-21 19:56 ` [PATCH v10 05/16] s390/vfio-ap: implement in-use callback for vfio_ap driver Tony Krowiak
2020-09-14 15:31 ` Cornelia Huck
2020-09-25 9:29 ` Halil Pasic
2020-09-29 14:00 ` Tony Krowiak
2020-08-21 19:56 ` [PATCH v10 06/16] s390/vfio-ap: introduce shadow APCB Tony Krowiak
2020-09-17 14:22 ` Cornelia Huck
2020-09-18 17:03 ` Tony Krowiak
2020-09-26 1:38 ` Halil Pasic
2020-09-29 16:04 ` Tony Krowiak
2020-09-29 16:19 ` Halil Pasic
2020-08-21 19:56 ` [PATCH v10 07/16] s390/vfio-ap: sysfs attribute to display the guest's matrix Tony Krowiak
2020-09-17 14:34 ` Cornelia Huck
2020-09-18 17:09 ` Tony Krowiak
2020-09-26 7:16 ` Halil Pasic
2020-09-29 21:00 ` Tony Krowiak
2020-08-21 19:56 ` [PATCH v10 08/16] s390/vfio-ap: filter matrix for unavailable queue devices Tony Krowiak
2020-09-26 8:24 ` Halil Pasic
2020-09-29 21:59 ` Tony Krowiak
2020-08-21 19:56 ` [PATCH v10 09/16] s390/vfio-ap: allow assignment of unavailable AP queues to mdev device Tony Krowiak
2020-09-26 23:49 ` Halil Pasic
2020-09-30 12:59 ` Tony Krowiak
2020-09-30 22:29 ` Halil Pasic
2020-08-21 19:56 ` [PATCH v10 10/16] s390/vfio-ap: allow configuration of matrix mdev in use by a KVM guest Tony Krowiak
2020-09-27 0:03 ` Halil Pasic
2020-09-30 13:19 ` Tony Krowiak [this message]
2020-08-21 19:56 ` [PATCH v10 11/16] s390/vfio-ap: allow hot plug/unplug of AP resources using mdev device Tony Krowiak
2020-09-28 1:01 ` Halil Pasic
2020-10-05 16:24 ` Tony Krowiak
2020-10-05 18:30 ` Halil Pasic
2020-10-05 21:48 ` Tony Krowiak
2020-10-05 23:05 ` Tony Krowiak
2020-08-21 19:56 ` [PATCH v10 12/16] s390/zcrypt: Notify driver on config changed and scan complete callbacks Tony Krowiak
2020-09-27 1:39 ` Halil Pasic
2020-08-21 19:56 ` [PATCH v10 13/16] s390/vfio-ap: handle host AP config change notification Tony Krowiak
2020-09-28 1:38 ` Halil Pasic
2020-10-12 20:53 ` Tony Krowiak
2020-10-12 21:27 ` Tony Krowiak
2020-08-21 19:56 ` [PATCH v10 14/16] s390/vfio-ap: handle AP bus scan completed notification Tony Krowiak
2020-09-28 2:11 ` Halil Pasic
2020-08-21 19:56 ` [PATCH v10 15/16] s390/vfio-ap: handle probe/remove not due to host AP config changes Tony Krowiak
2020-09-28 2:45 ` Halil Pasic
2020-08-21 19:56 ` [PATCH v10 16/16] s390/vfio-ap: update docs to include dynamic config support Tony Krowiak
2020-08-25 10:45 ` Cornelia Huck
2020-08-31 18:34 ` Tony Krowiak
2020-09-28 2:48 ` Halil Pasic
2020-10-16 16:36 ` Tony Krowiak
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