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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] x86-64 machine_to_phys vs NX bit
On 25/8/06 4:19 pm, "Rik van Riel" <riel@xxxxxxxxxx> wrote: >> A long is only 32 bits there, so when we pass the MFN portion the NX bit is >> conveniently truncated away! > > Which means it'll do the wrong thing for machine addresses > 4GB > on PAE, or am I overlooking something? No, it gets shifted right 12 and *then* converted to a long. So you get a 44-bit addressing capability (32+12). But NX bit is bit 63, so it gets truncated. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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