Re: [PATCH] vfio: Support P2P access in confidential VM

[Cédric Le Goater]

> > --- a/linux-headers/linux/vfio.h
> > +++ b/linux-headers/linux/vfio.h
> > @@ -1560,6 +1560,7 @@ struct vfio_iommu_type1_dma_map {
> >   #define VFIO_DMA_MAP_FLAG_READ (1 << 0)         /* readable from device */
> >   #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1)        /* writable from device */
> >   #define VFIO_DMA_MAP_FLAG_VADDR (1 << 2)
> > +#define VFIO_DMA_MAP_FLAG_MMIO (1 << 3)
>
> Where's the kernel patch that implements the MMIO map flag.  That needs
> to come first.

Yes. This patch should also be divided in 4 parts :

  - kernel header changes with links to the threads modifying the kernel.
  - common part,
  - vpda part,
  - and vfio,


Thanks,

C.



> I also don't understand why we're creating multiple read-only and
> ramdev flags to distill back into vfio mapping flags.  Thanks,