The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x 0823dc64586ba5ea13a7d200a5d33e4c5fa45950 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024081204-fraction-from-52aa@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..
Possible dependencies:
0823dc64586b ("vhost-vdpa: switch to use vmf_insert_pfn() in the fault handler") 729ce5a5bd6f ("vdpa: Make use of PFN_PHYS/PFN_UP/PFN_DOWN helper macro")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 0823dc64586ba5ea13a7d200a5d33e4c5fa45950 Mon Sep 17 00:00:00 2001 From: Jason Wang jasowang@redhat.com Date: Mon, 1 Jul 2024 11:31:59 +0800 Subject: [PATCH] vhost-vdpa: switch to use vmf_insert_pfn() in the fault handler
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 Message-Id: 20240701033159.18133-1-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin mst@redhat.com Reviewed-by: Michal Kubiak michal.kubiak@intel.com
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 = {