Re: [PATCH v2 2/3] vfio-pci: Fault mmaps to enable vma tracking

Peter Xu
2020-05-07T21:47:52Z

Hi, Alex,

On Tue, May 05, 2020 at 03:54:53PM -0600, Alex Williamson wrote:
> +/*
> + * Zap mmaps on open so that we can fault them in on access and therefore
> + * our vma_list only tracks mappings accessed since last zap.
> + */
> +static void vfio_pci_mmap_open(struct vm_area_struct *vma)
> +{
> + zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);

A pure question: is this only a safety-belt or it is required in some known
scenarios?

In all cases:

Reviewed-by: Peter Xu <peterx@redhat.com>

Thanks,

--
Peter Xu