From: Cornelia Huck <cohuck@redhat.com>
To: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com,
pbonzini@redhat.com, alex.williamson@redhat.com,
pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com,
mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com,
thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com,
fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com
Subject: Re: [PATCH v3 09/14] s390: vfio-ap: sysfs interfaces to configure domains
Date: Tue, 3 Apr 2018 13:17:59 +0200 [thread overview]
Message-ID: <20180403131759.24516cf4.cohuck@redhat.com> (raw)
In-Reply-To: <1521051954-25715-10-git-send-email-akrowiak@linux.vnet.ibm.com>
On Wed, 14 Mar 2018 14:25:49 -0400
Tony Krowiak <akrowiak@linux.vnet.ibm.com> wrote:
> Provides the sysfs interfaces for assigning AP domains to
> and unassigning AP domains from a mediated matrix device.
>
> An AP domain ID corresponds to an AP queue index (APQI). For
> each domain assigned to the mediated matrix device, its
> corresponging APQI is stored in an AP queue mask (AQM).
> The bits in the AQM, from most significant to least
> significant bit, correspond to AP domain numbers 0 to 255.
> When a domain is assigned, the bit corresponding to its
> APQI will be set in the AQM. Likewise, when a domain is
> unassigned, the bit corresponding to its APQI will be
> cleared from the AQM.
>
> The relevant sysfs structures are:
>
> /sys/devices/vfio_ap
> ... [matrix]
> ...... [mdev_supported_types]
> ......... [vfio_ap-passthrough]
> ............ [devices]
> ...............[$uuid]
> .................. assign_domain
> .................. unassign_domain
>
> To assign a domain to the $uuid mediated matrix device,
> write the domain's ID to the assign_domain file. To
> unassign a domain, write the domain's ID to the
> unassign_domain file. The ID is specified using
> conventional semantics: If it begins with 0x, the number
> will be parsed as a hexadecimal (case insensitive) number;
> otherwise, it will be parsed as a decimal number.
>
> For example, to assign domain 173 (0xad) to the mediated matrix
> device $uuid:
>
> echo 173 > assign_domain
>
> or
>
> echo 0xad > assign_domain
>
> To unassign domain 173 (0xad):
>
> echo 173 > unassign_domain
>
> or
>
> echo 0xad > unassign_domain
>
> The assignment will be rejected:
>
> * If the domain ID exceeds the maximum value for an AP domain:
>
> * If the AP Extended Addressing (APXA) facility is installed,
> the max value is 255
>
> * Else the max value is 15
>
> * If no AP adapters have yet been assigned and there are
> no AP queues reserved by the VFIO AP driver that have an APQN
> with an APQI matching that of the AP domain number being
> assigned.
>
> * If any of the APQNs that can be derived from the intersection
> of the APQI being assigned and the AP adapter ID (APID) of
> each of the AP adapters previously assigned can not be matched
> with an APQN of an AP queue device reserved by the VFIO AP
> driver.
>
> Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
> ---
> arch/s390/include/asm/kvm-ap.h | 1 +
> drivers/s390/crypto/vfio_ap_ops.c | 215 ++++++++++++++++++++++++++++++++++++-
> 2 files changed, 215 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
> index 90512a6..c448835 100644
> --- a/drivers/s390/crypto/vfio_ap_ops.c
> +++ b/drivers/s390/crypto/vfio_ap_ops.c
> @@ -377,10 +377,223 @@ static ssize_t unassign_adapter_store(struct device *dev,
> }
> DEVICE_ATTR_WO(unassign_adapter);
>
> +/**
> + * vfio_ap_validate_queues_for_apqi
> + *
> + * @ap_matrix: the matrix device
> + * @matrix_mdev: the mediated matrix device
> + * @apqi: an AP queue index (APQI) - corresponds to a domain ID
> + *
> + * Verifies that each APQN that is derived from the intersection of @apqi and
> + * each AP adapter ID (APID) corresponding to an AP domain assigned to the
> + * @matrix_mdev matches the APQN of an AP queue reserved by the VFIO AP device
> + * driver.
> + *
> + * Returns 0 if validation succeeds; otherwise, returns an error.
> + */
> +static int vfio_ap_validate_queues_for_apqi(struct ap_matrix *ap_matrix,
> + struct ap_matrix_mdev *matrix_mdev,
> + unsigned long apqi)
> +{
> + int ret;
> + struct vfio_ap_qid_match qid_match;
> + unsigned long apid;
> + struct device_driver *drv = ap_matrix->device.driver;
> +
> + /**
> + * Examine each APQN with the specified APQI
> + */
> + for_each_set_bit_inv(apid, matrix_mdev->matrix->apm,
> + matrix_mdev->matrix->apm_max) {
> + qid_match.qid = AP_MKQID(apid, apqi);
> + qid_match.dev = NULL;
> +
> + ret = driver_for_each_device(drv, NULL, &qid_match,
> + vfio_ap_queue_match);
> + if (ret)
> + return ret;
Hm, I'm wondering whether jumping out of the outer loop is the correct
thing to do here - and if yes, whether we should log an error?
> +
> + /*
> + * If the APQN identifies an AP queue that is reserved by the
> + * VFIO AP device driver, continue processing.
> + */
> + if (qid_match.dev)
> + continue;
> +
> + pr_err("%s: AP queue %02lx.%04lx not reserved by %s driver",
> + VFIO_AP_MATRIX_MODULE_NAME, apqi, apqi,
> + VFIO_AP_DRV_NAME);
> +
> + return -ENXIO;
> + }
> +
> + return 0;
> +}
next prev parent reply other threads:[~2018-04-03 11:18 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-14 18:25 [PATCH v3 00/14] s390: vfio-ap: guest dedicated crypto adapters Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 01/14] KVM: s390: refactor crypto initialization Tony Krowiak
2018-03-15 12:26 ` Pierre Morel
2018-03-15 14:48 ` Tony Krowiak
2018-03-15 14:55 ` Pierre Morel
2018-03-26 8:44 ` Cornelia Huck
2018-03-29 18:57 ` Tony Krowiak
2018-04-03 11:26 ` Cornelia Huck
2018-04-05 10:42 ` Christian Borntraeger
2018-04-05 10:45 ` Christian Borntraeger
2018-04-05 13:16 ` Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 02/14] s390: zcrypt: externalize AP instructions available function Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 03/14] KVM: s390: CPU model support for AP virtualization Tony Krowiak
2018-03-27 10:59 ` Cornelia Huck
2018-03-27 11:22 ` Pierre Morel
2018-03-27 11:30 ` Cornelia Huck
2018-03-14 18:25 ` [PATCH v3 04/14] KVM: s390: device attribute to set AP interpretive execution Tony Krowiak
2018-03-14 21:57 ` Halil Pasic
2018-03-15 13:00 ` Pierre Morel
2018-03-15 15:26 ` Tony Krowiak
2018-03-15 15:45 ` Pierre Morel
2018-03-15 17:21 ` Tony Krowiak
2018-03-15 17:56 ` Pierre Morel
2018-03-15 23:39 ` Tony Krowiak
2018-03-16 7:51 ` Pierre Morel
2018-03-16 16:09 ` Tony Krowiak
2018-03-20 17:58 ` Tony Krowiak
2018-03-20 22:48 ` Halil Pasic
2018-04-02 18:55 ` Tony Krowiak
2018-03-15 15:23 ` Tony Krowiak
2018-03-15 16:00 ` Pierre Morel
2018-03-15 23:37 ` Tony Krowiak
2018-03-15 16:25 ` Halil Pasic
2018-03-14 18:25 ` [PATCH v3 05/14] s390: vfio-ap: base implementation of VFIO AP device driver Tony Krowiak
2018-03-15 13:25 ` Pierre Morel
2018-03-15 17:25 ` Tony Krowiak
2018-03-27 11:17 ` Cornelia Huck
2018-03-27 14:45 ` Pierre Morel
2018-04-03 9:56 ` Cornelia Huck
2018-04-03 10:57 ` Cornelia Huck
2018-04-03 13:02 ` Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 06/14] s390: vfio-ap: register matrix device with VFIO mdev framework Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 07/14] KVM: s390: interfaces to configure/deconfigure guest's AP matrix Tony Krowiak
2018-04-03 11:07 ` Cornelia Huck
2018-04-03 13:17 ` Tony Krowiak
2018-04-03 13:38 ` Cornelia Huck
2018-03-14 18:25 ` [PATCH v3 08/14] s390: vfio-ap: sysfs interfaces to configure adapters Tony Krowiak
2018-04-03 11:10 ` Cornelia Huck
2018-04-03 13:33 ` Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 09/14] s390: vfio-ap: sysfs interfaces to configure domains Tony Krowiak
2018-04-03 11:17 ` Cornelia Huck [this message]
[not found] ` <1860430c-df59-6d58-77f9-b36c51595b4b@linux.vnet.ibm.com>
2018-04-03 15:19 ` Cornelia Huck
2018-04-03 15:42 ` Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 10/14] s390: vfio-ap: sysfs interfaces to configure control domains Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 11/14] s390: vfio-ap: sysfs interface to view matrix mdev matrix Tony Krowiak
2018-03-15 9:42 ` Pierre Morel
2018-03-15 14:52 ` Tony Krowiak
2018-03-15 15:35 ` Pierre Morel
2018-03-27 11:19 ` Cornelia Huck
2018-03-14 18:25 ` [PATCH v3 12/14] KVM: s390: configure the guest's AP devices Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 13/14] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl Tony Krowiak
2018-03-14 18:25 ` [PATCH v3 14/14] s390: doc: detailed specifications for AP virtualization Tony Krowiak
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