RE: [PATCH 10/10] vfio/qat: Add vfio_pci driver for Intel QAT VF devices

Shameerali Kolothum Thodi
2024-02-08T12:17:08Z

> -----Original Message-----
> From: Xin Zeng <xin.zeng@intel.com>
> Sent: Thursday, February 1, 2024 3:34 PM
> To: herbert@gondor.apana.org.au; alex.williamson@redhat.com;
> jgg@nvidia.com; yishaih@nvidia.com; Shameerali Kolothum Thodi
> <shameerali.kolothum.thodi@huawei.com>; kevin.tian@intel.com
> Cc: linux-crypto@vger.kernel.org; kvm@vger.kernel.org; qat-
> linux@intel.com; Xin Zeng <xin.zeng@intel.com>; Yahui Cao
> <yahui.cao@intel.com>
> Subject: [PATCH 10/10] vfio/qat: Add vfio_pci driver for Intel QAT VF devices
>
> Add vfio pci driver for Intel QAT VF devices.
>
> This driver uses vfio_pci_core to register to the VFIO subsystem. It
> acts as a vfio agent and interacts with the QAT PF driver to implement
> VF live migration.
>
> Co-developed-by: Yahui Cao <yahui.cao@intel.com>
> Signed-off-by: Yahui Cao <yahui.cao@intel.com>
> Signed-off-by: Xin Zeng <xin.zeng@intel.com>
> Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
> ---
> MAINTAINERS | 8 +
> drivers/vfio/pci/Kconfig | 2 +
> drivers/vfio/pci/Makefile | 2 +
> drivers/vfio/pci/intel/qat/Kconfig | 13 +
> drivers/vfio/pci/intel/qat/Makefile | 4 +
> drivers/vfio/pci/intel/qat/main.c | 572 ++++++++++++++++++++++++++++
> 6 files changed, 601 insertions(+)
> create mode 100644 drivers/vfio/pci/intel/qat/Kconfig
> create mode 100644 drivers/vfio/pci/intel/qat/Makefile
> create mode 100644 drivers/vfio/pci/intel/qat/main.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8d1052fa6a69..c1d3e4cb3892 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -23095,6 +23095,14 @@ S: Maintained
> F:
> Documentation/networking/device_drivers/ethernet/amd/pds_vfio_
> pci.rst
> F: drivers/vfio/pci/pds/
>
> +VFIO QAT PCI DRIVER
> +M: Xin Zeng <xin.zeng@intel.com>
> +M: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
> +L: kvm@vger.kernel.org
> +L: qat-linux@intel.com
> +S: Supported
> +F: drivers/vfio/pci/intel/qat/
> +
> VFIO PLATFORM DRIVER
> M: Eric Auger <eric.auger@redhat.com>
> L: kvm@vger.kernel.org
> diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
> index 18c397df566d..329d25c53274 100644
> --- a/drivers/vfio/pci/Kconfig
> +++ b/drivers/vfio/pci/Kconfig
> @@ -67,4 +67,6 @@ source "drivers/vfio/pci/pds/Kconfig"
>
> source "drivers/vfio/pci/virtio/Kconfig"
>
> +source "drivers/vfio/pci/intel/qat/Kconfig"
> +
> endmenu
> diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
> index 046139a4eca5..a87b6b43ce1c 100644
> --- a/drivers/vfio/pci/Makefile
> +++ b/drivers/vfio/pci/Makefile
> @@ -15,3 +15,5 @@ obj-$(CONFIG_HISI_ACC_VFIO_PCI) += hisilicon/
> obj-$(CONFIG_PDS_VFIO_PCI) += pds/
>
> obj-$(CONFIG_VIRTIO_VFIO_PCI) += virtio/
> +
> +obj-$(CONFIG_QAT_VFIO_PCI) += intel/qat/
> diff --git a/drivers/vfio/pci/intel/qat/Kconfig
> b/drivers/vfio/pci/intel/qat/Kconfig
> new file mode 100644
> index 000000000000..71b28ac0bf6a
> --- /dev/null
> +++ b/drivers/vfio/pci/intel/qat/Kconfig
> @@ -0,0 +1,13 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +config QAT_VFIO_PCI
> + tristate "VFIO support for QAT VF PCI devices"
> + select VFIO_PCI_CORE
> + depends on CRYPTO_DEV_QAT
> + depends on CRYPTO_DEV_QAT_4XXX
> + help
> + This provides migration support for Intel(R) QAT Virtual Function
> + using the VFIO framework.
> +
> + To compile this as a module, choose M here: the module
> + will be called qat_vfio_pci. If you don't know what to do here,
> + say N.
> diff --git a/drivers/vfio/pci/intel/qat/Makefile
> b/drivers/vfio/pci/intel/qat/Makefile
> new file mode 100644
> index 000000000000..9289ae4c51bf
> --- /dev/null
> +++ b/drivers/vfio/pci/intel/qat/Makefile
> @@ -0,0 +1,4 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +obj-$(CONFIG_QAT_VFIO_PCI) += qat_vfio_pci.o
> +qat_vfio_pci-y := main.o
> +
> diff --git a/drivers/vfio/pci/intel/qat/main.c
> b/drivers/vfio/pci/intel/qat/main.c
> new file mode 100644
> index 000000000000..85d0ed701397
> --- /dev/null
> +++ b/drivers/vfio/pci/intel/qat/main.c
> @@ -0,0 +1,572 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright(c) 2024 Intel Corporation */
> +
> +#include <linux/anon_inodes.h>
> +#include <linux/container_of.h>
> +#include <linux/device.h>
> +#include <linux/file.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/pci.h>
> +#include <linux/sizes.h>
> +#include <linux/types.h>
> +#include <linux/uaccess.h>
> +#include <linux/vfio_pci_core.h>
> +#include <linux/qat/qat_mig_dev.h>
> +
> +struct qat_vf_migration_file {
> + struct file *filp;
> + /* protects migration region context */
> + struct mutex lock;
> + bool disabled;
> + struct qat_mig_dev *mdev;
> +};
> +
> +struct qat_vf_core_device {
> + struct vfio_pci_core_device core_device;
> + struct qat_mig_dev *mdev;
> + /* protects migration state */
> + struct mutex state_mutex;
> + enum vfio_device_mig_state mig_state;
> + /* protects reset down flow */
> + spinlock_t reset_lock;
> + bool deferred_reset;
> + struct qat_vf_migration_file *resuming_migf;
> + struct qat_vf_migration_file *saving_migf;
> +};
> +
> +static int qat_vf_pci_open_device(struct vfio_device *core_vdev)
> +{
> + struct qat_vf_core_device *qat_vdev =
> + container_of(core_vdev, struct qat_vf_core_device,
> + core_device.vdev);
> + struct vfio_pci_core_device *vdev = &qat_vdev->core_device;
> + int ret;
> +
> + ret = vfio_pci_core_enable(vdev);
> + if (ret)
> + return ret;
> +
> + ret = qat_vdev->mdev->ops->open(qat_vdev->mdev);
> + if (ret) {
> + vfio_pci_core_disable(vdev);
> + return ret;
> + }
> + qat_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
> +
> + vfio_pci_core_finish_enable(vdev);
> +
> + return 0;
> +}
> +
> +static void qat_vf_disable_fd(struct qat_vf_migration_file *migf)
> +{
> + mutex_lock(&migf->lock);
> + migf->disabled = true;
> + migf->filp->f_pos = 0;
> + mutex_unlock(&migf->lock);
> +}
> +
> +static void qat_vf_disable_fds(struct qat_vf_core_device *qat_vdev)
> +{
> + if (qat_vdev->resuming_migf) {
> + qat_vf_disable_fd(qat_vdev->resuming_migf);
> + fput(qat_vdev->resuming_migf->filp);
> + qat_vdev->resuming_migf = NULL;
> + }
> +
> + if (qat_vdev->saving_migf) {
> + qat_vf_disable_fd(qat_vdev->saving_migf);
> + fput(qat_vdev->saving_migf->filp);
> + qat_vdev->saving_migf = NULL;
> + }
> +}
> +
> +static void qat_vf_pci_close_device(struct vfio_device *core_vdev)
> +{
> + struct qat_vf_core_device *qat_vdev = container_of(core_vdev,
> + struct qat_vf_core_device, core_device.vdev);
> +
> + qat_vdev->mdev->ops->close(qat_vdev->mdev);
> + qat_vf_disable_fds(qat_vdev);
> + vfio_pci_core_close_device(core_vdev);
> +}
> +
> +static ssize_t qat_vf_save_read(struct file *filp, char __user *buf,
> + size_t len, loff_t *pos)
> +{
> + struct qat_vf_migration_file *migf = filp->private_data;
> + ssize_t done = 0;
> + loff_t *offs;
> + int ret;
> +
> + if (pos)
> + return -ESPIPE;
> + offs = &filp->f_pos;
> +
> + mutex_lock(&migf->lock);
> + if (*offs > migf->mdev->state_size || *offs < 0) {
> + done = -EINVAL;
> + goto out_unlock;
> + }
> +
> + if (migf->disabled) {
> + done = -ENODEV;
> + goto out_unlock;
> + }
> +
> + len = min_t(size_t, migf->mdev->state_size - *offs, len);
> + if (len) {
> + ret = copy_to_user(buf, migf->mdev->state + *offs, len);
> + if (ret) {
> + done = -EFAULT;
> + goto out_unlock;
> + }
> + *offs += len;
> + done = len;
> + }
> +
> +out_unlock:
> + mutex_unlock(&migf->lock);
> + return done;
> +}
> +
> +static int qat_vf_release_file(struct inode *inode, struct file *filp)
> +{
> + struct qat_vf_migration_file *migf = filp->private_data;
> +
> + qat_vf_disable_fd(migf);
> + mutex_destroy(&migf->lock);
> + kfree(migf);
> +
> + return 0;
> +}
> +
> +static const struct file_operations qat_vf_save_fops = {
> + .owner = THIS_MODULE,
> + .read = qat_vf_save_read,
> + .release = qat_vf_release_file,
> + .llseek = no_llseek,
> +};
> +
> +static struct qat_vf_migration_file *
> +qat_vf_save_device_data(struct qat_vf_core_device *qat_vdev)
> +{
> + struct qat_vf_migration_file *migf;
> + int ret;
> +
> + migf = kzalloc(sizeof(*migf), GFP_KERNEL);
> + if (!migf)
> + return ERR_PTR(-ENOMEM);
> +
> + migf->filp = anon_inode_getfile("qat_vf_mig", &qat_vf_save_fops,
> migf, O_RDONLY);
> + ret = PTR_ERR_OR_ZERO(migf->filp);
> + if (ret) {
> + kfree(migf);
> + return ERR_PTR(ret);
> + }
> +
> + stream_open(migf->filp->f_inode, migf->filp);
> + mutex_init(&migf->lock);
> +
> + ret = qat_vdev->mdev->ops->save_state(qat_vdev->mdev);
> + if (ret) {
> + fput(migf->filp);
> + kfree(migf);

Probably don't need that kfree(migf) here as fput() --> qat_vf_release_file () will do that.

> + return ERR_PTR(ret);
> + }
> +
> + migf->mdev = qat_vdev->mdev;
> +
> + return migf;
> +}
> +
> +static ssize_t qat_vf_resume_write(struct file *filp, const char __user *buf,
> + size_t len, loff_t *pos)
> +{
> + struct qat_vf_migration_file *migf = filp->private_data;
> + loff_t end, *offs;
> + ssize_t done = 0;
> + int ret;
> +
> + if (pos)
> + return -ESPIPE;
> + offs = &filp->f_pos;
> +
> + if (*offs < 0 ||
> + check_add_overflow((loff_t)len, *offs, &end))
> + return -EOVERFLOW;
> +
> + if (end > migf->mdev->state_size)
> + return -ENOMEM;
> +
> + mutex_lock(&migf->lock);
> + if (migf->disabled) {
> + done = -ENODEV;
> + goto out_unlock;
> + }
> +
> + ret = copy_from_user(migf->mdev->state + *offs, buf, len);
> + if (ret) {
> + done = -EFAULT;
> + goto out_unlock;
> + }
> + *offs += len;
> + done = len;
> +
> +out_unlock:
> + mutex_unlock(&migf->lock);
> + return done;
> +}
> +
> +static const struct file_operations qat_vf_resume_fops = {
> + .owner = THIS_MODULE,
> + .write = qat_vf_resume_write,
> + .release = qat_vf_release_file,
> + .llseek = no_llseek,
> +};
> +
> +static struct qat_vf_migration_file *
> +qat_vf_resume_device_data(struct qat_vf_core_device *qat_vdev)
> +{
> + struct qat_vf_migration_file *migf;
> + int ret;
> +
> + migf = kzalloc(sizeof(*migf), GFP_KERNEL);
> + if (!migf)
> + return ERR_PTR(-ENOMEM);
> +
> + migf->filp = anon_inode_getfile("qat_vf_mig", &qat_vf_resume_fops,
> migf, O_WRONLY);
> + ret = PTR_ERR_OR_ZERO(migf->filp);
> + if (ret) {
> + kfree(migf);
> + return ERR_PTR(ret);
> + }
> +
> + migf->mdev = qat_vdev->mdev;
> + stream_open(migf->filp->f_inode, migf->filp);
> + mutex_init(&migf->lock);
> +
> + return migf;
> +}
> +
> +static int qat_vf_load_device_data(struct qat_vf_core_device *qat_vdev)
> +{
> + return qat_vdev->mdev->ops->load_state(qat_vdev->mdev);
> +}
> +
> +static struct file *qat_vf_pci_step_device_state(struct qat_vf_core_device
> *qat_vdev, u32 new)
> +{
> + u32 cur = qat_vdev->mig_state;
> + int ret;
> +
> + if ((cur == VFIO_DEVICE_STATE_RUNNING && new ==
> VFIO_DEVICE_STATE_RUNNING_P2P)) {
> + ret = qat_vdev->mdev->ops->suspend(qat_vdev->mdev);
> + if (ret)
> + return ERR_PTR(ret);
> + return NULL;
> + }
> +
> + if ((cur == VFIO_DEVICE_STATE_RUNNING_P2P && new ==
> VFIO_DEVICE_STATE_STOP) ||
> + (cur == VFIO_DEVICE_STATE_STOP && new ==
> VFIO_DEVICE_STATE_RUNNING_P2P))
> + return NULL;
> +
> + if (cur == VFIO_DEVICE_STATE_STOP && new ==
> VFIO_DEVICE_STATE_STOP_COPY) {
> + struct qat_vf_migration_file *migf;
> +
> + migf = qat_vf_save_device_data(qat_vdev);
> + if (IS_ERR(migf))
> + return ERR_CAST(migf);
> + get_file(migf->filp);
> + qat_vdev->saving_migf = migf;
> + return migf->filp;
> + }
> +
> + if (cur == VFIO_DEVICE_STATE_STOP_COPY && new ==
> VFIO_DEVICE_STATE_STOP) {
> + qat_vf_disable_fds(qat_vdev);
> + return NULL;
> + }
> +
> + if (cur == VFIO_DEVICE_STATE_STOP && new ==
> VFIO_DEVICE_STATE_RESUMING) {
> + struct qat_vf_migration_file *migf;
> +
> + migf = qat_vf_resume_device_data(qat_vdev);
> + if (IS_ERR(migf))
> + return ERR_CAST(migf);
> + get_file(migf->filp);
> + qat_vdev->resuming_migf = migf;
> + return migf->filp;
> + }
> +
> + if (cur == VFIO_DEVICE_STATE_RESUMING && new ==
> VFIO_DEVICE_STATE_STOP) {
> + ret = qat_vf_load_device_data(qat_vdev);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + qat_vf_disable_fds(qat_vdev);
> + return NULL;
> + }
> +
> + if (cur == VFIO_DEVICE_STATE_RUNNING_P2P && new ==
> VFIO_DEVICE_STATE_RUNNING) {
> + qat_vdev->mdev->ops->resume(qat_vdev->mdev);
> + return NULL;
> + }
> +
> + /* vfio_mig_get_next_state() does not use arcs other than the above
> */
> + WARN_ON(true);
> + return ERR_PTR(-EINVAL);
> +}
> +
> +static void qat_vf_state_mutex_unlock(struct qat_vf_core_device
> *qat_vdev)
> +{
> +again:
> + spin_lock(&qat_vdev->reset_lock);
> + if (qat_vdev->deferred_reset) {
> + qat_vdev->deferred_reset = false;
> + spin_unlock(&qat_vdev->reset_lock);
> + qat_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
> + qat_vf_disable_fds(qat_vdev);
> + goto again;
> + }
> + mutex_unlock(&qat_vdev->state_mutex);
> + spin_unlock(&qat_vdev->reset_lock);
> +}
> +
> +static struct file *qat_vf_pci_set_device_state(struct vfio_device *vdev,
> + enum vfio_device_mig_state
> new_state)
> +{
> + struct qat_vf_core_device *qat_vdev = container_of(vdev,
> + struct qat_vf_core_device, core_device.vdev);
> + enum vfio_device_mig_state next_state;
> + struct file *res = NULL;
> + int ret;
> +
> + mutex_lock(&qat_vdev->state_mutex);
> + while (new_state != qat_vdev->mig_state) {
> + ret = vfio_mig_get_next_state(vdev, qat_vdev->mig_state,
> + new_state, &next_state);
> + if (ret) {
> + res = ERR_PTR(ret);
> + break;
> + }
> + res = qat_vf_pci_step_device_state(qat_vdev, next_state);
> + if (IS_ERR(res))
> + break;
> + qat_vdev->mig_state = next_state;
> + if (WARN_ON(res && new_state != qat_vdev->mig_state)) {
> + fput(res);
> + res = ERR_PTR(-EINVAL);
> + break;
> + }
> + }
> + qat_vf_state_mutex_unlock(qat_vdev);
> +
> + return res;
> +}
> +
> +static int qat_vf_pci_get_device_state(struct vfio_device *vdev,
> + enum vfio_device_mig_state *curr_state)
> +{
> + struct qat_vf_core_device *qat_vdev = container_of(vdev,
> + struct qat_vf_core_device, core_device.vdev);
> +
> + mutex_lock(&qat_vdev->state_mutex);
> + *curr_state = qat_vdev->mig_state;
> + qat_vf_state_mutex_unlock(qat_vdev);
> +
> + return 0;
> +}
> +
> +static int qat_vf_pci_get_data_size(struct vfio_device *vdev,
> + unsigned long *stop_copy_length)
> +{
> + struct qat_vf_core_device *qat_vdev = container_of(vdev,
> + struct qat_vf_core_device, core_device.vdev);
> +
> + *stop_copy_length = qat_vdev->mdev->state_size;

Do we need a lock here or this is not changing?

> + return 0;
> +}
> +
> +static const struct vfio_migration_ops qat_vf_pci_mig_ops = {
> + .migration_set_state = qat_vf_pci_set_device_state,
> + .migration_get_state = qat_vf_pci_get_device_state,
> + .migration_get_data_size = qat_vf_pci_get_data_size,
> +};
> +
> +static void qat_vf_pci_release_dev(struct vfio_device *core_vdev)
> +{
> + struct qat_vf_core_device *qat_vdev = container_of(core_vdev,
> + struct qat_vf_core_device, core_device.vdev);
> +
> + qat_vdev->mdev->ops->cleanup(qat_vdev->mdev);
> + qat_vfmig_destroy(qat_vdev->mdev);
> + mutex_destroy(&qat_vdev->state_mutex);
> + vfio_pci_core_release_dev(core_vdev);
> +}
> +
> +static int qat_vf_pci_init_dev(struct vfio_device *core_vdev)
> +{
> + struct qat_vf_core_device *qat_vdev = container_of(core_vdev,
> + struct qat_vf_core_device, core_device.vdev);
> + struct qat_migdev_ops *ops;
> + struct qat_mig_dev *mdev;
> + struct pci_dev *parent;
> + int ret, vf_id;
> +
> + core_vdev->migration_flags = VFIO_MIGRATION_STOP_COPY |
> VFIO_MIGRATION_P2P;
> + core_vdev->mig_ops = &qat_vf_pci_mig_ops;
> +
> + ret = vfio_pci_core_init_dev(core_vdev);
> + if (ret)
> + return ret;
> +
> + mutex_init(&qat_vdev->state_mutex);
> + spin_lock_init(&qat_vdev->reset_lock);
> +
> + parent = qat_vdev->core_device.pdev->physfn;

Can we use pci_physfn() here?

> + vf_id = pci_iov_vf_id(qat_vdev->core_device.pdev);
> + if (!parent || vf_id < 0) {

Also if the pci_iov_vf_id() return success I don't think you need to
check for parent and can use directly below.

> + ret = -ENODEV;
> + goto err_rel;
> + }
> +
> + mdev = qat_vfmig_create(parent, vf_id);
> + if (IS_ERR(mdev)) {
> + ret = PTR_ERR(mdev);
> + goto err_rel;
> + }
> +
> + ops = mdev->ops;
> + if (!ops || !ops->init || !ops->cleanup ||
> + !ops->open || !ops->close ||
> + !ops->save_state || !ops->load_state ||
> + !ops->suspend || !ops->resume) {
> + ret = -EIO;
> + dev_err(&parent->dev, "Incomplete device migration ops
> structure!");
> + goto err_destroy;
> + }

If all these ops are a must why cant we move the check inside the qat_vfmig_create()?
Or rather call them explicitly as suggested by Jason.

Thanks,
Shameer

> + ret = ops->init(mdev);
> + if (ret)
> + goto err_destroy;
> +
> + qat_vdev->mdev = mdev;
> +
> + return 0;
> +
> +err_destroy:
> + qat_vfmig_destroy(mdev);
> +err_rel:
> + vfio_pci_core_release_dev(core_vdev);
> + return ret;
> +}
> +
> +static const struct vfio_device_ops qat_vf_pci_ops = {
> + .name = "qat-vf-vfio-pci",
> + .init = qat_vf_pci_init_dev,
> + .release = qat_vf_pci_release_dev,
> + .open_device = qat_vf_pci_open_device,
> + .close_device = qat_vf_pci_close_device,
> + .ioctl = vfio_pci_core_ioctl,
> + .read = vfio_pci_core_read,
> + .write = vfio_pci_core_write,
> + .mmap = vfio_pci_core_mmap,
> + .request = vfio_pci_core_request,
> + .match = vfio_pci_core_match,
> + .bind_iommufd = vfio_iommufd_physical_bind,
> + .unbind_iommufd = vfio_iommufd_physical_unbind,
> + .attach_ioas = vfio_iommufd_physical_attach_ioas,
> + .detach_ioas = vfio_iommufd_physical_detach_ioas,
> +};
> +
> +static struct qat_vf_core_device *qat_vf_drvdata(struct pci_dev *pdev)
> +{
> + struct vfio_pci_core_device *core_device = pci_get_drvdata(pdev);
> +
> + return container_of(core_device, struct qat_vf_core_device,
> core_device);
> +}
> +
> +static void qat_vf_pci_aer_reset_done(struct pci_dev *pdev)
> +{
> + struct qat_vf_core_device *qat_vdev = qat_vf_drvdata(pdev);
> +
> + if (!qat_vdev->core_device.vdev.mig_ops)
> + return;
> +
> + /*
> + * As the higher VFIO layers are holding locks across reset and using
> + * those same locks with the mm_lock we need to prevent ABBA
> deadlock
> + * with the state_mutex and mm_lock.
> + * In case the state_mutex was taken already we defer the cleanup
> work
> + * to the unlock flow of the other running context.
> + */
> + spin_lock(&qat_vdev->reset_lock);
> + qat_vdev->deferred_reset = true;
> + if (!mutex_trylock(&qat_vdev->state_mutex)) {
> + spin_unlock(&qat_vdev->reset_lock);
> + return;
> + }
> + spin_unlock(&qat_vdev->reset_lock);
> + qat_vf_state_mutex_unlock(qat_vdev);
> +}
> +
> +static int
> +qat_vf_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> +{
> + struct device *dev = &pdev->dev;
> + struct qat_vf_core_device *qat_vdev;
> + int ret;
> +
> + qat_vdev = vfio_alloc_device(qat_vf_core_device, core_device.vdev,
> dev, &qat_vf_pci_ops);
> + if (IS_ERR(qat_vdev))
> + return PTR_ERR(qat_vdev);
> +
> + pci_set_drvdata(pdev, &qat_vdev->core_device);
> + ret = vfio_pci_core_register_device(&qat_vdev->core_device);
> + if (ret)
> + goto out_put_device;
> +
> + return 0;
> +
> +out_put_device:
> + vfio_put_device(&qat_vdev->core_device.vdev);
> + return ret;
> +}
> +
> +static void qat_vf_vfio_pci_remove(struct pci_dev *pdev)
> +{
> + struct qat_vf_core_device *qat_vdev = qat_vf_drvdata(pdev);
> +
> + vfio_pci_core_unregister_device(&qat_vdev->core_device);
> + vfio_put_device(&qat_vdev->core_device.vdev);
> +}
> +
> +static const struct pci_device_id qat_vf_vfio_pci_table[] = {
> + /* Intel QAT GEN4 4xxx VF device */
> + { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL,
> 0x4941) },
> + { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL,
> 0x4943) },
> + { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL,
> 0x4945) },
> + {}
> +};
> +MODULE_DEVICE_TABLE(pci, qat_vf_vfio_pci_table);
> +
> +static const struct pci_error_handlers qat_vf_err_handlers = {
> + .reset_done = qat_vf_pci_aer_reset_done,
> + .error_detected = vfio_pci_core_aer_err_detected,
> +};
> +
> +static struct pci_driver qat_vf_vfio_pci_driver = {
> + .name = "qat_vfio_pci",
> + .id_table = qat_vf_vfio_pci_table,
> + .probe = qat_vf_vfio_pci_probe,
> + .remove = qat_vf_vfio_pci_remove,
> + .err_handler = &qat_vf_err_handlers,
> + .driver_managed_dma = true,
> +};
> +module_pci_driver(qat_vf_vfio_pci_driver)
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Intel Corporation");
> +MODULE_DESCRIPTION("QAT VFIO PCI - VFIO PCI driver with live migration
> support for Intel(R) QAT GEN4 device family");
> +MODULE_IMPORT_NS(CRYPTO_QAT);
> --
> 2.18.2