linux-kernel - Re: [PATCH] vdpa_sim: get rid of DMA ops

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Date:   Fri, 27 Jan 2023 05:29:47 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Stefano Garzarella <sgarzare@...hat.com>, eperezma@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, xieyongji@...edance.com, hch@....de
Subject: Re: [PATCH] vdpa_sim: get rid of DMA ops

On Mon, Dec 26, 2022 at 12:12:42PM +0800, Jason Wang wrote:
> > >@@ -682,6 +553,11 @@ static int vdpasim_dma_unmap(struct vdpa_device *vdpa, unsigned int asid,
> > >       if (asid >= vdpasim->dev_attr.nas)
> > >               return -EINVAL;
> > >
> > >+      if (vdpasim->iommu_pt[asid]) {
> >
> > We are in the vdpasim_dma_unmap, so if vdpasim->iommu_pt[asid] is true,
> > should be better to return an error, since this case should not happen?
> 
> So it's a question of how to behave when unmap is called without a
> map. I think we can leave the code as is or if we wish, it needs a
> separate patch.
> 
> (We didn't error this previously anyhow).
> 
> Thanks

OK I picked as is. Do we want WARN_ON maybe?

-- 
MST