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OpenCloudOS-Kernel
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vhost_vdpa: disable doorbell mapping for !MMU 

There could be ways to support doorbell mapping with !MMU, but things
like pgprot_noncached are not universally supported.
Fixable, but just disable this for now.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2020-06-04 14:47:29 -04:00
parent ddd89d0a05
commit 4b4e4867d9
1 changed files with 4 additions and 0 deletions
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4
drivers/vhost/vdpa.c
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@ -740,6 +740,7 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep)
return 0;
}
#ifdef CONFIG_MMU
static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf)
{
struct vhost_vdpa *v = vmf->vma->vm_file->private_data;
@ -796,6 +797,7 @@ static int vhost_vdpa_mmap(struct file *file, struct vm_area_struct *vma)
vma->vm_ops = &vhost_vdpa_vm_ops;
return 0;
}
#endif /* CONFIG_MMU */
static const struct file_operations vhost_vdpa_fops = {
.owner = THIS_MODULE,
@ -803,7 +805,9 @@ static const struct file_operations vhost_vdpa_fops = {
.release = vhost_vdpa_release,
.write_iter = vhost_vdpa_chr_write_iter,
.unlocked_ioctl = vhost_vdpa_unlocked_ioctl,
#ifdef CONFIG_MMU
.mmap = vhost_vdpa_mmap,
#endif /* CONFIG_MMU */
.compat_ioctl = compat_ptr_ioctl,
};