On Mon, Jul 01, 2024 at 11:31:59AM +0800, Jason Wang wrote:
remap_pfn_page() should not be called in the fault handler as it may change the vma->flags which may trigger lockdep warning since the vma write lock is not held. Actually there's no need to modify the vma->flags as it has been set in the mmap(). So this patch switches to use vmf_insert_pfn() instead.
Reported-by: Dragos Tatulea dtatulea@nvidia.com Tested-by: Dragos Tatulea dtatulea@nvidia.com Fixes: ddd89d0a059d ("vhost_vdpa: support doorbell mapping via mmap") Cc: stable@vger.kernel.org Signed-off-by: Jason Wang jasowang@redhat.com
drivers/vhost/vdpa.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 63a53680a85c..6b9c12acf438 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -1483,13 +1483,7 @@ static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf) notify = ops->get_vq_notification(vdpa, index);
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
- if (remap_pfn_range(vma, vmf->address & PAGE_MASK,
PFN_DOWN(notify.addr), PAGE_SIZE,vma->vm_page_prot))return VM_FAULT_SIGBUS;- return VM_FAULT_NOPAGE;
- return vmf_insert_pfn(vma, vmf->address & PAGE_MASK, PFN_DOWN(notify.addr));
} static const struct vm_operations_struct vhost_vdpa_vm_ops = { -- 2.31.1
I would only consider pasting an example warning log. (It's my suggestion only).
Anyway, the patch looks OK to me.
Thanks, Reviewed-by: Michal Kubiak michal.kubiak@intel.com