From: Tony Krowiak <akrowiak@linux.ibm.com>
To: Pierre Morel <pmorel@linux.ibm.com>, borntraeger@de.ibm.com
Cc: alex.williamson@redhat.com, cohuck@redhat.com,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
kvm@vger.kernel.org, frankja@linux.ibm.com, pasic@linux.ibm.com,
david@redhat.com, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com, freude@linux.ibm.com,
mimu@linux.ibm.com
Subject: Re: [PATCH v4 6/7] s390: ap: Cleanup on removing the AP device
Date: Fri, 8 Mar 2019 17:43:45 -0500 [thread overview]
Message-ID: <3956ad4c-55c9-e42c-4ab2-00ddae05b317@linux.ibm.com> (raw)
In-Reply-To: <1550849400-27152-7-git-send-email-pmorel@linux.ibm.com>
On 2/22/19 10:29 AM, Pierre Morel wrote:
> When the device is remove, we must make sure to
> clear the interruption and reset the AP device.
>
> We also need to clear the CRYCB of the guest.
>
> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> ---
> drivers/s390/crypto/vfio_ap_drv.c | 35 +++++++++++++++++++++++++++++++++++
> drivers/s390/crypto/vfio_ap_ops.c | 3 ++-
> drivers/s390/crypto/vfio_ap_private.h | 3 +++
> 3 files changed, 40 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c
> index eca0ffc..e5d91ff 100644
> --- a/drivers/s390/crypto/vfio_ap_drv.c
> +++ b/drivers/s390/crypto/vfio_ap_drv.c
> @@ -5,6 +5,7 @@
> * Copyright IBM Corp. 2018
> *
> * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
> + * Pierre Morel <pmorel@linux.ibm.com>
> */
>
> #include <linux/module.h>
> @@ -12,6 +13,8 @@
> #include <linux/slab.h>
> #include <linux/string.h>
> #include <asm/facility.h>
> +#include <linux/bitops.h>
> +#include <linux/kvm_host.h>
> #include "vfio_ap_private.h"
>
> #define VFIO_AP_ROOT_NAME "vfio_ap"
> @@ -61,6 +64,33 @@ static int vfio_ap_queue_dev_probe(struct ap_device *apdev)
> }
>
> /**
> + * vfio_ap_update_crycb
> + * @q: A pointer to the queue being removed
> + *
> + * We clear the APID of the queue, making this queue unusable for the guest.
> + * After this function we can reset the queue without to fear a race with
> + * the guest to access the queue again.
> + * We do not fear race with the host as we still get the device.
> + */
> +static void vfio_ap_update_crycb(struct vfio_ap_queue *q)
> +{
> + struct ap_matrix_mdev *matrix_mdev = q->matrix_mdev;
> +
> + if (!matrix_mdev)
> + return;
> +
> + clear_bit_inv(AP_QID_CARD(q->apqn), matrix_mdev->matrix.apm);
> +
> + if (!matrix_mdev->kvm)
> + return;
> +
> + kvm_arch_crypto_set_masks(matrix_mdev->kvm,
> + matrix_mdev->matrix.apm,
> + matrix_mdev->matrix.aqm,
> + matrix_mdev->matrix.adm);
> +}
> +
> +/**
> * vfio_ap_queue_dev_remove:
> *
> * Free the associated vfio_ap_queue structure
> @@ -70,6 +100,11 @@ static void vfio_ap_queue_dev_remove(struct ap_device *apdev)
> struct vfio_ap_queue *q;
>
> q = dev_get_drvdata(&apdev->device);
> + if (!q)
> + return;
> +
> + vfio_ap_update_crycb(q);
> + vfio_ap_mdev_reset_queue(q);
Since the bit corresponding to the APID is cleared in the
vfio_ap_update_crycb() above, shouldn't all queues on that
card also be reset?
> list_del(&q->list);
> kfree(q);
> }
> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
> index 0196065..5b9bb33 100644
> --- a/drivers/s390/crypto/vfio_ap_ops.c
> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> @@ -59,6 +59,7 @@ int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q)
> if (retry <= 0)
> pr_warn("%s: queue 0x%04x not empty\n",
> __func__, q->apqn);
> + vfio_ap_free_irq(q);
Shouldn't this be done for the response codes that terminate this loop
such as those caught by the default case?
> return 0;
> case AP_RESPONSE_RESET_IN_PROGRESS:
> case AP_RESPONSE_BUSY:
> @@ -83,7 +84,7 @@ int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q)
> * Unregister the ISC from the GIB alert
> * Clear the vfio_ap_queue intern fields
> */
> -static void vfio_ap_free_irq(struct vfio_ap_queue *q)
> +void vfio_ap_free_irq(struct vfio_ap_queue *q)
> {
> if (!q)
> return;
> diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
> index e2fd2c0..cc18215 100644
> --- a/drivers/s390/crypto/vfio_ap_private.h
> +++ b/drivers/s390/crypto/vfio_ap_private.h
> @@ -4,6 +4,7 @@
> *
> * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
> * Halil Pasic <pasic@linux.ibm.com>
> + * Pierre Morel <pmorel@linux.ibm.com>
> *
> * Copyright IBM Corp. 2018
> */
> @@ -98,4 +99,6 @@ struct vfio_ap_queue {
> int apqn;
> unsigned char isc;
> };
> +void vfio_ap_free_irq(struct vfio_ap_queue *q);
> +int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q);
> #endif /* _VFIO_AP_PRIVATE_H_ */
>
next prev parent reply other threads:[~2019-03-08 22:43 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-22 15:29 [PATCH v4 0/7] vfio: ap: AP Queue Interrupt Control Pierre Morel
2019-02-22 15:29 ` [PATCH v4 1/7] s390: ap: kvm: add PQAP interception for AQIC Pierre Morel
2019-02-25 18:36 ` Tony Krowiak
2019-02-26 11:47 ` Pierre Morel
2019-02-26 15:47 ` Tony Krowiak
2019-02-27 8:09 ` Pierre Morel
2019-02-27 9:13 ` Cornelia Huck
2019-02-27 10:16 ` Pierre Morel
2019-02-27 18:00 ` Tony Krowiak
2019-02-28 9:42 ` Christian Borntraeger
2019-02-28 11:03 ` Christian Borntraeger
2019-02-28 11:22 ` Cornelia Huck
2019-02-28 13:16 ` Pierre Morel
2019-02-28 13:52 ` Cornelia Huck
2019-02-28 14:14 ` Pierre Morel
2019-03-01 12:03 ` Pierre Morel
2019-03-01 12:05 ` Christian Borntraeger
2019-03-01 12:36 ` Cornelia Huck
2019-03-01 15:32 ` Pierre Morel
2019-02-28 13:10 ` Pierre Morel
2019-02-28 15:36 ` Tony Krowiak
2019-02-28 12:39 ` Halil Pasic
2019-02-28 14:12 ` Pierre Morel
2019-02-28 16:51 ` Halil Pasic
2019-03-01 12:10 ` Pierre Morel
2019-02-28 15:43 ` Tony Krowiak
2019-02-28 13:23 ` Pierre Morel
2019-02-28 13:44 ` Christian Borntraeger
2019-02-28 13:47 ` Pierre Morel
2019-02-28 14:07 ` Halil Pasic
2019-02-28 14:13 ` Pierre Morel
2019-02-28 15:45 ` Tony Krowiak
2019-02-28 15:35 ` Tony Krowiak
2019-03-01 8:42 ` Christian Borntraeger
2019-02-28 8:31 ` Christian Borntraeger
2019-02-22 15:29 ` [PATCH v4 2/7] s390: ap: new vfio_ap_queue structure Pierre Morel
2019-02-26 16:10 ` Tony Krowiak
2019-02-27 8:40 ` Pierre Morel
2019-02-27 20:35 ` Tony Krowiak
2019-02-22 15:29 ` [PATCH v4 3/7] s390: ap: associate a ap_vfio_queue and a matrix mdev Pierre Morel
2019-02-26 18:14 ` Tony Krowiak
2019-02-27 9:29 ` Pierre Morel
2019-02-27 20:14 ` Tony Krowiak
2019-02-27 9:32 ` Cornelia Huck
2019-02-27 10:21 ` Pierre Morel
2019-02-27 10:44 ` Pierre Morel
2019-02-27 20:53 ` Tony Krowiak
2019-03-04 2:09 ` Halil Pasic
2019-03-04 10:19 ` Pierre Morel
2019-03-05 22:17 ` Tony Krowiak
2019-03-12 21:39 ` Tony Krowiak
2019-03-13 10:19 ` Pierre Morel
2019-02-22 15:29 ` [PATCH v4 4/7] vfio: ap: register IOMMU VFIO notifier Pierre Morel
2019-02-27 9:42 ` Cornelia Huck
2019-02-27 10:22 ` Pierre Morel
2019-02-28 8:23 ` Christian Borntraeger
2019-02-28 8:48 ` Pierre Morel
2019-02-28 16:55 ` Halil Pasic
2019-03-01 7:51 ` Christian Borntraeger
2019-02-22 15:29 ` [PATCH v4 5/7] s390: ap: implement PAPQ AQIC interception in kernel Pierre Morel
2019-02-26 18:23 ` Tony Krowiak
2019-02-27 9:54 ` Pierre Morel
2019-02-27 18:17 ` Tony Krowiak
2019-02-27 18:18 ` Tony Krowiak
2019-02-28 20:20 ` Christian Borntraeger
2019-03-01 9:35 ` Pierre Morel
2019-03-04 1:57 ` Halil Pasic
2019-03-04 9:47 ` Pierre Morel
2019-02-22 15:29 ` [PATCH v4 6/7] s390: ap: Cleanup on removing the AP device Pierre Morel
2019-02-26 18:27 ` Tony Krowiak
2019-02-27 9:58 ` Pierre Morel
2019-03-04 13:02 ` Cornelia Huck
2019-03-08 22:43 ` Tony Krowiak [this message]
2019-03-11 8:31 ` Pierre Morel
2019-03-12 21:53 ` Tony Krowiak
2019-03-13 10:15 ` Pierre Morel
2019-02-22 15:30 ` [PATCH v4 7/7] s390: ap: kvm: Enable PQAP/AQIC facility for the guest Pierre Morel
2019-02-28 15:08 ` [PATCH v4 0/7] vfio: ap: AP Queue Interrupt Control Halil Pasic
2019-03-01 9:40 ` Pierre Morel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3956ad4c-55c9-e42c-4ab2-00ddae05b317@linux.ibm.com \
--to=akrowiak@linux.ibm.com \
--cc=alex.williamson@redhat.com \
--cc=borntraeger@de.ibm.com \
--cc=cohuck@redhat.com \
--cc=david@redhat.com \
--cc=frankja@linux.ibm.com \
--cc=freude@linux.ibm.com \
--cc=heiko.carstens@de.ibm.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=mimu@linux.ibm.com \
--cc=pasic@linux.ibm.com \
--cc=pmorel@linux.ibm.com \
--cc=schwidefsky@de.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).