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Date: Wed, 23 Nov 2022 11:32:33 +0000
From: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
To: <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <alex.williamson@...hat.com>, <jgg@...dia.com>,
<yishaih@...dia.com>, <kevin.tian@...el.com>,
<linuxarm@...wei.com>, <liulongfang@...wei.com>,
<prime.zeng@...ilicon.com>
Subject: [PATCH 1/4] hisi_acc_vfio_pci: Add support for precopy IOCTL
PRECOPY IOCTL in the case of HiSiIicon ACC driver can be used to
perform the device compatibility check earlier during migration.
Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
---
.../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 52 +++++++++++++++++++
.../vfio/pci/hisilicon/hisi_acc_vfio_pci.h | 1 +
2 files changed, 53 insertions(+)
diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
index 0c0c0c7f0521..f3b74a06edb6 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -764,9 +764,58 @@ hisi_acc_vf_pci_resume(struct hisi_acc_vf_core_device *hisi_acc_vdev)
stream_open(migf->filp->f_inode, migf->filp);
mutex_init(&migf->lock);
+ migf->hisi_acc_vdev = hisi_acc_vdev;
return migf;
}
+static long hisi_acc_vf_precopy_ioctl(struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hisi_acc_vf_migration_file *migf = filp->private_data;
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = migf->hisi_acc_vdev;
+ loff_t *pos = &filp->f_pos;
+ struct vfio_precopy_info info;
+ unsigned long minsz;
+ int ret;
+
+ if (cmd != VFIO_MIG_GET_PRECOPY_INFO)
+ return -ENOTTY;
+
+ minsz = offsetofend(struct vfio_precopy_info, dirty_bytes);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ mutex_lock(&hisi_acc_vdev->state_mutex);
+ if (hisi_acc_vdev->mig_state != VFIO_DEVICE_STATE_PRE_COPY) {
+ mutex_unlock(&hisi_acc_vdev->state_mutex);
+ return -EINVAL;
+ }
+
+ mutex_lock(&migf->lock);
+
+ if (migf->disabled) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (*pos > migf->total_length) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ info.dirty_bytes = 0;
+ info.initial_bytes = migf->total_length - *pos;
+
+ ret = copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
+out:
+ mutex_unlock(&migf->lock);
+ mutex_unlock(&hisi_acc_vdev->state_mutex);
+ return ret;
+}
+
static ssize_t hisi_acc_vf_save_read(struct file *filp, char __user *buf, size_t len,
loff_t *pos)
{
@@ -807,6 +856,8 @@ static ssize_t hisi_acc_vf_save_read(struct file *filp, char __user *buf, size_t
static const struct file_operations hisi_acc_vf_save_fops = {
.owner = THIS_MODULE,
.read = hisi_acc_vf_save_read,
+ .unlocked_ioctl = hisi_acc_vf_precopy_ioctl,
+ .compat_ioctl = compat_ptr_ioctl,
.release = hisi_acc_vf_release_file,
.llseek = no_llseek,
};
@@ -832,6 +883,7 @@ hisi_acc_vf_stop_copy(struct hisi_acc_vf_core_device *hisi_acc_vdev)
stream_open(migf->filp->f_inode, migf->filp);
mutex_init(&migf->lock);
+ migf->hisi_acc_vdev = hisi_acc_vdev;
ret = vf_qm_state_save(hisi_acc_vdev, migf);
if (ret) {
diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
index 67343325b320..11d51345f5b5 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
@@ -91,6 +91,7 @@ struct hisi_acc_vf_migration_file {
struct mutex lock;
bool disabled;
+ struct hisi_acc_vf_core_device *hisi_acc_vdev;
struct acc_vf_data vf_data;
size_t total_length;
};
--
2.34.1
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