From: Cornelia Huck <cohuck@redhat.com>
To: Pierre Morel <pmorel@linux.ibm.com>
Cc: borntraeger@de.ibm.com, alex.williamson@redhat.com,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org,
kvm@vger.kernel.org, frankja@linux.ibm.com,
akrowiak@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 v3 4/9] s390: ap: tools to find a queue with a specific APQN
Date: Fri, 15 Feb 2019 11:24:06 +0100 [thread overview]
Message-ID: <20190215112406.1ff79c50.cohuck@redhat.com> (raw)
In-Reply-To: <423e3f5b-dbbe-92b1-cfd3-d5a6f4e38f37@linux.ibm.com>
On Fri, 15 Feb 2019 11:10:43 +0100
Pierre Morel <pmorel@linux.ibm.com> wrote:
> On 15/02/2019 10:49, Cornelia Huck wrote:
> > On Thu, 14 Feb 2019 14:51:04 +0100
> > Pierre Morel <pmorel@linux.ibm.com> wrote:
> >
> >> We need to find the queue with a specific APQN during the
> >> handling of the interception of the PQAP/AQIC instruction.
> >>
> >> To handle the AP associated device reference count we keep
> >> track of it in the vfio_ap_queue until we put the device.
> >
> > So, the relationship is
> > (struct ap_device)--(driver_data)-->(struct vfio_ap_queue)--(pointer)-->(struct ap_device)
> > ? IOW, a backlink?
> >
> > If so, can't you already set that up during probe?
>
> Will do.
>
> >
> > Or am I confused by the various similar devices again? Maybe a diagram
> > would help...
>
> No you are right.
Good, I was fearing that I was more confused than normal for Fridays ;)
>
>
> >
> >>
> >> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
> >> ---
> >> drivers/s390/crypto/vfio_ap_ops.c | 54 +++++++++++++++++++++++++++++++++++
> >> drivers/s390/crypto/vfio_ap_private.h | 1 +
> >> 2 files changed, 55 insertions(+)
> >>
> >> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
> >> index 900b9cf..2a52c9b 100644
> >> --- a/drivers/s390/crypto/vfio_ap_ops.c
> >> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> >> @@ -24,6 +24,60 @@
> >> #define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
> >> #define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"
> >>
> >> +/**
> >> + * vfio_ap_check_apqn: check if a ap_queue is of a given APQN
> >> + *
> >> + * Returns 1 if we have a match.
> >> + * Otherwise returns 0.
> >> + */
> >> +static int vfio_ap_check_apqn(struct device *dev, void *data)
> >> +{
> >> + struct vfio_ap_queue *q = dev_get_drvdata(dev);
> >> +
> >> + return (q->apqn == *(int *)data);
> >> +}
> >> +
> >> +/**
> >> + * vfio_ap_get_queue: Retrieve a queue with a specific APQN
> >> + * @apqn: The queue APQN
> >> + *
> >> + * Retrieve a queue with a specific APQN from the list of the
> >> + * devices associated to the vfio_ap_driver.
> >> + *
> >> + * The vfio_ap_queue has been already associated with the device
> >> + * during the probe.
> >> + * Store the associated device for reference counting
> >> + *
> >> + * Returns the pointer to the associated vfio_ap_queue
> >> + */
> >> +static __attribute__((unused))
> >
> > Eww. Can you get rid of that by reordering or squashing patches?
>
> I did this to avoid posting a very big patch.
> I will of course squash 4 and 5 with patch 6, when the two patches 4 and
> 5 are reviewed.
>
> If you think it brings more clarity to squash all for the next iteration
> I will do.
Let's just see what the patches look like in the end. If a squashed
patch is not too unwieldy, I'd prefer that over those unused
annotations, though.
Hoping for review from others as well ;)
next prev parent reply other threads:[~2019-02-15 10:24 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 13:51 [PATCH v3 0/9] [RFC] vfio: ap: ioctl definitions for AP Queue Interrupt Control Pierre Morel
2019-02-14 13:51 ` [PATCH v3 1/9] s390: vfio_ap: link the vfio_ap devices to the vfio_ap bus subsystem Pierre Morel
2019-02-14 14:54 ` Cornelia Huck
2019-02-14 15:05 ` Christian Borntraeger
2019-02-14 15:40 ` Cornelia Huck
2019-02-14 17:12 ` Tony Krowiak
2019-02-14 17:35 ` Pierre Morel
2019-02-14 15:47 ` Pierre Morel
2019-02-14 16:57 ` Cornelia Huck
2019-02-14 17:36 ` Pierre Morel
2019-02-14 18:30 ` Tony Krowiak
2019-02-15 9:11 ` Cornelia Huck
2019-02-15 21:59 ` Tony Krowiak
2019-02-18 12:01 ` Cornelia Huck
2019-02-18 16:35 ` Tony Krowiak
2019-02-18 16:57 ` Cornelia Huck
2019-02-19 22:27 ` Tony Krowiak
2019-02-20 9:05 ` Cornelia Huck
2019-02-14 15:01 ` Christian Borntraeger
2019-02-14 15:09 ` Pierre Morel
2019-02-14 13:51 ` [PATCH v3 2/9] s390: ap: kvm: setting a hook for PQAP instructions Pierre Morel
2019-02-14 15:54 ` Cornelia Huck
2019-02-14 16:45 ` Pierre Morel
2019-02-15 9:26 ` Cornelia Huck
2019-02-15 9:55 ` Pierre Morel
2019-02-15 22:02 ` Tony Krowiak
2019-02-18 18:29 ` Pierre Morel
2019-02-18 22:42 ` Cornelia Huck
2019-02-19 19:50 ` Pierre Morel
2019-02-19 22:36 ` Tony Krowiak
2019-02-21 12:40 ` Pierre Morel
2019-02-19 22:50 ` Tony Krowiak
2019-02-14 13:51 ` [PATCH v3 3/9] s390: ap: new vfio_ap_queue structure Pierre Morel
2019-02-15 9:37 ` Cornelia Huck
2019-02-15 9:58 ` Pierre Morel
2019-02-14 13:51 ` [PATCH v3 4/9] s390: ap: tools to find a queue with a specific APQN Pierre Morel
2019-02-15 9:49 ` Cornelia Huck
2019-02-15 10:10 ` Pierre Morel
2019-02-15 10:24 ` Cornelia Huck [this message]
2019-02-15 22:13 ` Tony Krowiak
2019-02-18 12:21 ` Cornelia Huck
2019-02-18 18:32 ` Pierre Morel
2019-02-22 15:04 ` Tony Krowiak
2019-02-14 13:51 ` [PATCH v3 5/9] s390: ap: tools to associate a queue to a matrix Pierre Morel
2019-02-15 22:30 ` Tony Krowiak
2019-02-18 18:36 ` Pierre Morel
2019-02-14 13:51 ` [PATCH v3 6/9] vfio: ap: register IOMMU VFIO notifier Pierre Morel
2019-02-15 22:55 ` Tony Krowiak
2019-02-19 9:59 ` Halil Pasic
2019-02-19 19:04 ` Pierre Morel
2019-02-19 21:33 ` Tony Krowiak
2019-02-19 18:51 ` Pierre Morel
2019-02-14 13:51 ` [PATCH v3 7/9] s390: ap: implement PAPQ AQIC interception in kernel Pierre Morel
2019-02-15 23:11 ` Tony Krowiak
2019-02-19 19:16 ` Pierre Morel
2019-02-20 11:54 ` Halil Pasic
2019-02-21 12:50 ` Pierre Morel
2019-02-14 13:51 ` [PATCH v3 8/9] s390: ap: Cleanup on removing the AP device Pierre Morel
2019-02-15 23:29 ` Tony Krowiak
2019-02-19 19:29 ` Pierre Morel
2019-02-15 23:36 ` Tony Krowiak
2019-02-19 19:41 ` Pierre Morel
2019-02-14 13:51 ` [PATCH v3 9/9] s390: ap: kvm: add AP Queue Interruption Control facility Pierre Morel
2019-02-14 20:33 ` [PATCH v3 0/9] [RFC] vfio: ap: ioctl definitions for AP Queue Interrupt Control Tony Krowiak
2019-02-15 8:44 ` Pierre Morel
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