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[Xen-ia64-devel] Mapping invalid address

from [Tristan Gingold]

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Subject:	[Xen-ia64-devel] Mapping invalid address
From:	Tristan Gingold <Tristan.Gingold@xxxxxxxx>
Date:	Fri, 17 Mar 2006 15:34:31 +0100
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Hi,

when domU tries to map an bad mpa, it maps page 0 instead.

This is how vcpu_itc_d works:
        pteval = translate_domain_pte(pte,ifa,itir);
        if (!pteval) return IA64_ILLOP_FAULT;

Because translate_domain_pte end is:
        pteval2 = lookup_domain_mpa(d,mpaddr);
        pteval2 &= _PAGE_PPN_MASK; // ignore non-addr bits
        pteval2 |= _PAGE_PL_2; // force PL0->2 (PL3 is unaffected)
        pteval2 = (pteval & ~_PAGE_PPN_MASK) | pteval2;
        return pteval2;
}

Therefore, translate_domain_pte never returns 0.

it is expected, or should we fix this behavior ?

Tristan.



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