diff mbox series

[v13,07/15] s390/vfio-ap: introduce shadow APCB

Message ID 20201223011606.5265-8-akrowiak@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series s390/vfio-ap: dynamic configuration support | expand

Commit Message

Anthony Krowiak Dec. 23, 2020, 1:15 a.m. UTC
The APCB is a field within the CRYCB that provides the AP configuration
to a KVM guest. Let's introduce a shadow copy of the KVM guest's APCB and
maintain it for the lifespan of the guest.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
---
 drivers/s390/crypto/vfio_ap_ops.c     | 15 +++++++++++++++
 drivers/s390/crypto/vfio_ap_private.h |  2 ++
 2 files changed, 17 insertions(+)

Comments

Halil Pasic Jan. 11, 2021, 10:50 p.m. UTC | #1
On Tue, 22 Dec 2020 20:15:58 -0500
Tony Krowiak <akrowiak@linux.ibm.com> wrote:

> The APCB is a field within the CRYCB that provides the AP configuration
> to a KVM guest. Let's introduce a shadow copy of the KVM guest's APCB and
> maintain it for the lifespan of the guest.
> 
> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
> Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
> ---
>  drivers/s390/crypto/vfio_ap_ops.c     | 15 +++++++++++++++
>  drivers/s390/crypto/vfio_ap_private.h |  2 ++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
> index 2d58b39977be..44b3a81cadfb 100644
> --- a/drivers/s390/crypto/vfio_ap_ops.c
> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> @@ -293,6 +293,20 @@ static void vfio_ap_matrix_init(struct ap_config_info *info,
>  	matrix->adm_max = info->apxa ? info->Nd : 15;
>  }
>  
> +static bool vfio_ap_mdev_has_crycb(struct ap_matrix_mdev *matrix_mdev)
> +{
> +	return (matrix_mdev->kvm && matrix_mdev->kvm->arch.crypto.crycbd);
> +}
> +
> +static void vfio_ap_mdev_commit_shadow_apcb(struct ap_matrix_mdev *matrix_mdev)
> +{
> +	if (vfio_ap_mdev_has_crycb(matrix_mdev))
> +		kvm_arch_crypto_set_masks(matrix_mdev->kvm,
> +					  matrix_mdev->shadow_apcb.apm,
> +					  matrix_mdev->shadow_apcb.aqm,
> +					  matrix_mdev->shadow_apcb.adm);
> +}
> +
>  static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
>  {
>  	struct ap_matrix_mdev *matrix_mdev;
> @@ -308,6 +322,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
>  
>  	matrix_mdev->mdev = mdev;
>  	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
> +	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
>  	hash_init(matrix_mdev->qtable);
>  	mdev_set_drvdata(mdev, matrix_mdev);
>  	matrix_mdev->pqap_hook.hook = handle_pqap;
> diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
> index 4e5cc72fc0db..d2d26ba18602 100644
> --- a/drivers/s390/crypto/vfio_ap_private.h
> +++ b/drivers/s390/crypto/vfio_ap_private.h
> @@ -75,6 +75,7 @@ struct ap_matrix {
>   * @list:	allows the ap_matrix_mdev struct to be added to a list
>   * @matrix:	the adapters, usage domains and control domains assigned to the
>   *		mediated matrix device.
> + * @shadow_apcb:    the shadow copy of the APCB field of the KVM guest's CRYCB
>   * @group_notifier: notifier block used for specifying callback function for
>   *		    handling the VFIO_GROUP_NOTIFY_SET_KVM event
>   * @kvm:	the struct holding guest's state
> @@ -82,6 +83,7 @@ struct ap_matrix {
>  struct ap_matrix_mdev {
>  	struct list_head node;
>  	struct ap_matrix matrix;
> +	struct ap_matrix shadow_apcb;
>  	struct notifier_block group_notifier;
>  	struct notifier_block iommu_notifier;
>  	struct kvm *kvm;

What happened to the following hunk from v12?

@@ -1218,13 +1233,9 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
 	if (ret)
 		return NOTIFY_DONE;
 
-	/* If there is no CRYCB pointer, then we can't copy the masks */
-	if (!matrix_mdev->kvm->arch.crypto.crycbd)
-		return NOTIFY_DONE;
-
-	kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
-				  matrix_mdev->matrix.aqm,
-				  matrix_mdev->matrix.adm);
+	memcpy(&matrix_mdev->shadow_apcb, &matrix_mdev->matrix,
+	       sizeof(matrix_mdev->shadow_apcb));
+	vfio_ap_mdev_commit_shadow_apcb(matrix_mdev);
 
 	return NOTIFY_OK;
 }
Anthony Krowiak Jan. 14, 2021, 9:35 p.m. UTC | #2
On 1/11/21 5:50 PM, Halil Pasic wrote:
> On Tue, 22 Dec 2020 20:15:58 -0500
> Tony Krowiak <akrowiak@linux.ibm.com> wrote:
>
>> The APCB is a field within the CRYCB that provides the AP configuration
>> to a KVM guest. Let's introduce a shadow copy of the KVM guest's APCB and
>> maintain it for the lifespan of the guest.
>>
>> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
>> Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
>> ---
>>   drivers/s390/crypto/vfio_ap_ops.c     | 15 +++++++++++++++
>>   drivers/s390/crypto/vfio_ap_private.h |  2 ++
>>   2 files changed, 17 insertions(+)
>>
>> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
>> index 2d58b39977be..44b3a81cadfb 100644
>> --- a/drivers/s390/crypto/vfio_ap_ops.c
>> +++ b/drivers/s390/crypto/vfio_ap_ops.c
>> @@ -293,6 +293,20 @@ static void vfio_ap_matrix_init(struct ap_config_info *info,
>>   	matrix->adm_max = info->apxa ? info->Nd : 15;
>>   }
>>   
>> +static bool vfio_ap_mdev_has_crycb(struct ap_matrix_mdev *matrix_mdev)
>> +{
>> +	return (matrix_mdev->kvm && matrix_mdev->kvm->arch.crypto.crycbd);
>> +}
>> +
>> +static void vfio_ap_mdev_commit_shadow_apcb(struct ap_matrix_mdev *matrix_mdev)
>> +{
>> +	if (vfio_ap_mdev_has_crycb(matrix_mdev))
>> +		kvm_arch_crypto_set_masks(matrix_mdev->kvm,
>> +					  matrix_mdev->shadow_apcb.apm,
>> +					  matrix_mdev->shadow_apcb.aqm,
>> +					  matrix_mdev->shadow_apcb.adm);
>> +}
>> +
>>   static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
>>   {
>>   	struct ap_matrix_mdev *matrix_mdev;
>> @@ -308,6 +322,7 @@ static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
>>   
>>   	matrix_mdev->mdev = mdev;
>>   	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
>> +	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
>>   	hash_init(matrix_mdev->qtable);
>>   	mdev_set_drvdata(mdev, matrix_mdev);
>>   	matrix_mdev->pqap_hook.hook = handle_pqap;
>> diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
>> index 4e5cc72fc0db..d2d26ba18602 100644
>> --- a/drivers/s390/crypto/vfio_ap_private.h
>> +++ b/drivers/s390/crypto/vfio_ap_private.h
>> @@ -75,6 +75,7 @@ struct ap_matrix {
>>    * @list:	allows the ap_matrix_mdev struct to be added to a list
>>    * @matrix:	the adapters, usage domains and control domains assigned to the
>>    *		mediated matrix device.
>> + * @shadow_apcb:    the shadow copy of the APCB field of the KVM guest's CRYCB
>>    * @group_notifier: notifier block used for specifying callback function for
>>    *		    handling the VFIO_GROUP_NOTIFY_SET_KVM event
>>    * @kvm:	the struct holding guest's state
>> @@ -82,6 +83,7 @@ struct ap_matrix {
>>   struct ap_matrix_mdev {
>>   	struct list_head node;
>>   	struct ap_matrix matrix;
>> +	struct ap_matrix shadow_apcb;
>>   	struct notifier_block group_notifier;
>>   	struct notifier_block iommu_notifier;
>>   	struct kvm *kvm;
> What happened to the following hunk from v12?

That's a very good question, I'll reinstate it.

>
> @@ -1218,13 +1233,9 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
>   	if (ret)
>   		return NOTIFY_DONE;
>   
> -	/* If there is no CRYCB pointer, then we can't copy the masks */
> -	if (!matrix_mdev->kvm->arch.crypto.crycbd)
> -		return NOTIFY_DONE;
> -
> -	kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
> -				  matrix_mdev->matrix.aqm,
> -				  matrix_mdev->matrix.adm);
> +	memcpy(&matrix_mdev->shadow_apcb, &matrix_mdev->matrix,
> +	       sizeof(matrix_mdev->shadow_apcb));
> +	vfio_ap_mdev_commit_shadow_apcb(matrix_mdev);
>   
>   	return NOTIFY_OK;
>   }
diff mbox series

Patch

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 2d58b39977be..44b3a81cadfb 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -293,6 +293,20 @@  static void vfio_ap_matrix_init(struct ap_config_info *info,
 	matrix->adm_max = info->apxa ? info->Nd : 15;
 }
 
+static bool vfio_ap_mdev_has_crycb(struct ap_matrix_mdev *matrix_mdev)
+{
+	return (matrix_mdev->kvm && matrix_mdev->kvm->arch.crypto.crycbd);
+}
+
+static void vfio_ap_mdev_commit_shadow_apcb(struct ap_matrix_mdev *matrix_mdev)
+{
+	if (vfio_ap_mdev_has_crycb(matrix_mdev))
+		kvm_arch_crypto_set_masks(matrix_mdev->kvm,
+					  matrix_mdev->shadow_apcb.apm,
+					  matrix_mdev->shadow_apcb.aqm,
+					  matrix_mdev->shadow_apcb.adm);
+}
+
 static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
 {
 	struct ap_matrix_mdev *matrix_mdev;
@@ -308,6 +322,7 @@  static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
 
 	matrix_mdev->mdev = mdev;
 	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
+	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->shadow_apcb);
 	hash_init(matrix_mdev->qtable);
 	mdev_set_drvdata(mdev, matrix_mdev);
 	matrix_mdev->pqap_hook.hook = handle_pqap;
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index 4e5cc72fc0db..d2d26ba18602 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -75,6 +75,7 @@  struct ap_matrix {
  * @list:	allows the ap_matrix_mdev struct to be added to a list
  * @matrix:	the adapters, usage domains and control domains assigned to the
  *		mediated matrix device.
+ * @shadow_apcb:    the shadow copy of the APCB field of the KVM guest's CRYCB
  * @group_notifier: notifier block used for specifying callback function for
  *		    handling the VFIO_GROUP_NOTIFY_SET_KVM event
  * @kvm:	the struct holding guest's state
@@ -82,6 +83,7 @@  struct ap_matrix {
 struct ap_matrix_mdev {
 	struct list_head node;
 	struct ap_matrix matrix;
+	struct ap_matrix shadow_apcb;
 	struct notifier_block group_notifier;
 	struct notifier_block iommu_notifier;
 	struct kvm *kvm;