linux-kernel - Re: [PATCH 3/7] vfio/pci: Use vfio_device_unmap_mapping

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Message-ID: <20210810135932.6825833b.alex.williamson@redhat.com>
Date:   Tue, 10 Aug 2021 13:59:32 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     Jason Gunthorpe <jgg@...dia.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 3/7] vfio/pci: Use vfio_device_unmap_mapping_range()

On Tue, 10 Aug 2021 14:48:31 -0400
Peter Xu <peterx@...hat.com> wrote:

> On Thu, Aug 05, 2021 at 11:07:35AM -0600, Alex Williamson wrote:
> > @@ -1690,7 +1554,7 @@ static int vfio_pci_mmap(struct vfio_device *core_vdev, struct vm_area_struct *v
> >  
> >  	vma->vm_private_data = vdev;
> >  	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> > -	vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
> > +	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);  
> 
> This addition seems to be an accident. :) Thanks,

Nope, Jason noted on a previous version that io_remap_pfn_range() is
essentially:

  remap_pfn_range(vma, addr, pfn, size, pgprot_decrypted(prot));

So since we switched to vmf_insert_pfn() I added this page protection
flag to the vma instead, then it gets removed later when we switch back
to io_remap_pfn_range().  Thanks,

Alex