Re: IOCTL_PRIVCMD_MMAPBATCH on Xen 4.13.0

[Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>]

On Sun, May 17, 2020 at 07:32:59PM +0200, Manuel Bouyer wrote:
> I've been looking a bit deeper in the Xen kernel.
> The mapping is failed in ./arch/x86/mm/p2m.c:p2m_get_page_from_gfn(),
>         /* Error path: not a suitable GFN at all */
>       if ( !p2m_is_ram(*t) && !p2m_is_paging(*t) && !p2m_is_pod(*t) ) {
>           gdprintk(XENLOG_ERR, "p2m_get_page_from_gfn2: %d is_ram %ld 
> is_paging %ld is_pod %ld\n", *t, p2m_is_ram(*t), p2m_is_paging(*t), 
> p2m_is_pod(*t) );
>           return NULL;
>       }
> 
> *t is 4, which translates to p2m_mmio_dm
> 
> it looks like p2m_get_page_from_gfn() is not ready to handle this case
> for dom0.

And so it looks like I need to implement osdep_xenforeignmemory_map_resource()
for NetBSD

-- 
Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>
     NetBSD: 26 ans d'experience feront toujours la difference
--