From: Cindy Lu <lulu@redhat.com>
To: lulu@redhat.com, jasowang@redhat.com, mst@redhat.com,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org
Subject: [PATCH v5 4/5] vduse: Add file operation for mmap
Date: Fri, 12 Apr 2024 21:28:24 +0800 [thread overview]
Message-ID: <20240412133017.483407-5-lulu@redhat.com> (raw)
In-Reply-To: <20240412133017.483407-1-lulu@redhat.com>
Add the operation for mmap, This function will be used by the user space
application to map the pages to the user space.
Signed-off-by: Cindy Lu <lulu@redhat.com>
---
drivers/vdpa/vdpa_user/vduse_dev.c | 57 ++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 2da659d5f4a8..7abe0c17cf0e 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -1465,6 +1465,61 @@ static struct vduse_dev *vduse_dev_get_from_minor(int minor)
return dev;
}
+static vm_fault_t vduse_vm_fault(struct vm_fault *vmf)
+{
+ struct vduse_dev *dev = vmf->vma->vm_file->private_data;
+ struct vm_area_struct *vma = vmf->vma;
+ u16 index = vma->vm_pgoff;
+ struct vduse_virtqueue *vq;
+ unsigned long vaddr;
+
+ /* index 0~vq_number-1 page reserved for virtqueue state*/
+ vq = dev->vqs[index];
+ vaddr = vq->vdpa_reconnect_vaddr;
+ if (remap_pfn_range(vma, vmf->address & PAGE_MASK,
+ PFN_DOWN(virt_to_phys((void *)vaddr)), PAGE_SIZE,
+ vma->vm_page_prot))
+ return VM_FAULT_SIGBUS;
+ return VM_FAULT_NOPAGE;
+}
+
+static const struct vm_operations_struct vduse_vm_ops = {
+ .fault = vduse_vm_fault,
+};
+
+static int vduse_dev_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct vduse_dev *dev = file->private_data;
+ unsigned long vaddr = 0;
+ unsigned long index = vma->vm_pgoff;
+ struct vduse_virtqueue *vq;
+
+ if (vma->vm_end - vma->vm_start != PAGE_SIZE)
+ return -EINVAL;
+ if ((vma->vm_flags & VM_SHARED) == 0)
+ return -EINVAL;
+ if (index >= dev->vq_num)
+ return -EINVAL;
+
+ index = array_index_nospec(index, dev->vq_num);
+ vq = dev->vqs[index];
+ vaddr = vq->vdpa_reconnect_vaddr;
+ if (vaddr == 0)
+ return -EOPNOTSUPP;
+
+ if (virt_to_phys((void *)vaddr) & (PAGE_SIZE - 1))
+ return -EINVAL;
+
+ /* Check if the Userspace App mapped the correct size */
+ if (vma->vm_end - vma->vm_start != PAGE_SIZE)
+ return -EOPNOTSUPP;
+
+ vm_flags_set(vma, VM_DONTEXPAND);
+ vma->vm_ops = &vduse_vm_ops;
+
+ return 0;
+}
+
static int vduse_dev_open(struct inode *inode, struct file *file)
{
int ret;
@@ -1497,6 +1552,8 @@ static const struct file_operations vduse_dev_fops = {
.unlocked_ioctl = vduse_dev_ioctl,
.compat_ioctl = compat_ptr_ioctl,
.llseek = noop_llseek,
+ .mmap = vduse_dev_mmap,
+
};
static ssize_t irq_cb_affinity_show(struct vduse_virtqueue *vq, char *buf)
--
2.43.0
next prev parent reply other threads:[~2024-04-12 13:31 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-12 13:28 [PATCH v5 0/5] vduse: Add support for reconnection Cindy Lu
2024-04-12 13:28 ` [PATCH v5 1/5] vduse: Add new ioctl VDUSE_DEV_GET_CONFIG Cindy Lu
2024-04-12 13:28 ` [PATCH v5 2/5] vduse: Add new ioctl VDUSE_DEV_GET_STATUS Cindy Lu
2024-04-12 13:28 ` [PATCH v5 3/5] vduse: Add function to get/free the pages for reconnection Cindy Lu
2024-04-17 9:29 ` Michael S. Tsirkin
2024-04-18 0:57 ` Jason Wang
2024-04-22 20:05 ` Michael S. Tsirkin
2024-04-23 3:09 ` Jason Wang
2024-04-23 8:42 ` Michael S. Tsirkin
2024-04-24 0:44 ` Jason Wang
2024-04-24 3:14 ` Cindy Lu
2024-04-24 3:51 ` Jason Wang
2024-04-24 9:51 ` Michael S. Tsirkin
2024-04-25 1:35 ` Jason Wang
2024-04-25 10:26 ` Michael S. Tsirkin
2024-04-12 13:28 ` Cindy Lu [this message]
2024-04-12 13:28 ` [PATCH v5 5/5] Documentation: Add reconnect process for VDUSE Cindy Lu
2024-04-16 3:46 ` Jason Wang
2024-04-17 8:46 ` Cindy Lu
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