Re: IOCTL_PRIVCMD_MMAPBATCH on Xen 4.13.0

[Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>]

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.

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