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s390/vfio-ap: realize the VFIO_DEVICE_SET_IRQS ioctl

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Realize the VFIO_DEVICE_SET_IRQS ioctl to set an eventfd file descriptor
to be used by the vfio_ap device driver to signal a device request to
userspace.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20230530223538.279198-3-akrowiak@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Tony Krowiak 2023-05-30 18:35:37 -04:00 committed by Alexander Gordeev
parent 6afc770048
commit bf48961f6f
2 changed files with 86 additions and 0 deletions
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83
drivers/s390/crypto/vfio_ap_ops.c
View File

@ -716,6 +716,7 @@ static int vfio_ap_mdev_probe(struct mdev_device *mdev)
ret = vfio_register_emulated_iommu_dev(&matrix_mdev->vdev);
if (ret)
goto err_put_vdev;
matrix_mdev->req_trigger = NULL;
dev_set_drvdata(&mdev->dev, matrix_mdev);
mutex_lock(&matrix_dev->mdevs_lock);
list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
@ -1780,6 +1781,85 @@ static ssize_t vfio_ap_get_irq_info(unsigned long arg)
return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
}
static int vfio_ap_irq_set_init(struct vfio_irq_set *irq_set, unsigned long arg)
{
int ret;
size_t data_size;
unsigned long minsz;
minsz = offsetofend(struct vfio_irq_set, count);
if (copy_from_user(irq_set, (void __user *)arg, minsz))
return -EFAULT;
ret = vfio_set_irqs_validate_and_prepare(irq_set, 1, VFIO_AP_NUM_IRQS,
&data_size);
if (ret)
return ret;
if (!(irq_set->flags & VFIO_IRQ_SET_ACTION_TRIGGER))
return -EINVAL;
return 0;
}
static int vfio_ap_set_request_irq(struct ap_matrix_mdev *matrix_mdev,
unsigned long arg)
{
s32 fd;
void __user *data;
unsigned long minsz;
struct eventfd_ctx *req_trigger;
minsz = offsetofend(struct vfio_irq_set, count);
data = (void __user *)(arg + minsz);
if (get_user(fd, (s32 __user *)data))
return -EFAULT;
if (fd == -1) {
if (matrix_mdev->req_trigger)
eventfd_ctx_put(matrix_mdev->req_trigger);
matrix_mdev->req_trigger = NULL;
} else if (fd >= 0) {
req_trigger = eventfd_ctx_fdget(fd);
if (IS_ERR(req_trigger))
return PTR_ERR(req_trigger);
if (matrix_mdev->req_trigger)
eventfd_ctx_put(matrix_mdev->req_trigger);
matrix_mdev->req_trigger = req_trigger;
} else {
return -EINVAL;
}
return 0;
}
static int vfio_ap_set_irqs(struct ap_matrix_mdev *matrix_mdev,
unsigned long arg)
{
int ret;
struct vfio_irq_set irq_set;
ret = vfio_ap_irq_set_init(&irq_set, arg);
if (ret)
return ret;
switch (irq_set.flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
case VFIO_IRQ_SET_DATA_EVENTFD:
switch (irq_set.index) {
case VFIO_AP_REQ_IRQ_INDEX:
return vfio_ap_set_request_irq(matrix_mdev, arg);
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static ssize_t vfio_ap_mdev_ioctl(struct vfio_device *vdev,
unsigned int cmd, unsigned long arg)
{
@ -1798,6 +1878,9 @@ static ssize_t vfio_ap_mdev_ioctl(struct vfio_device *vdev,
case VFIO_DEVICE_GET_IRQ_INFO:
ret = vfio_ap_get_irq_info(arg);
break;
case VFIO_DEVICE_SET_IRQS:
ret = vfio_ap_set_irqs(matrix_mdev, arg);
break;
default:
ret = -EOPNOTSUPP;
break;

3
drivers/s390/crypto/vfio_ap_private.h
View File

@ -15,6 +15,7 @@
#include <linux/types.h>
#include <linux/mdev.h>
#include <linux/delay.h>
#include <linux/eventfd.h>
#include <linux/mutex.h>
#include <linux/kvm_host.h>
#include <linux/vfio.h>
@ -103,6 +104,7 @@ struct ap_queue_table {
* PQAP(AQIC) instruction.
* @mdev: the mediated device
* @qtable: table of queues (struct vfio_ap_queue) assigned to the mdev
* @req_trigger eventfd ctx for signaling userspace to return a device
* @apm_add: bitmap of APIDs added to the host's AP configuration
* @aqm_add: bitmap of APQIs added to the host's AP configuration
* @adm_add: bitmap of control domain numbers added to the host's AP
@ -117,6 +119,7 @@ struct ap_matrix_mdev {
crypto_hook pqap_hook;
struct mdev_device *mdev;
struct ap_queue_table qtable;
struct eventfd_ctx *req_trigger;
DECLARE_BITMAP(apm_add, AP_DEVICES);
DECLARE_BITMAP(aqm_add, AP_DOMAINS);
DECLARE_BITMAP(adm_add, AP_DOMAINS);