Messages in this thread | | | Date | Mon, 10 Mar 2008 14:26:16 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: quicklists confuse meminfo |
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H. Peter Anvin wrote: > Jeremy Fitzhardinge wrote: >> >> Yeah, the most fundamental problem is that the whole page is RO, so >> even if Xen trapped and emulated, it still makes a very bad >> neighbour. I was also going to say that there's no reason why you >> couldn't pack multiple pgds into one page, but I think we can only >> specify the cr3 at page resolution anyway. >> > > Wrong. With PAE you can specify it at any 32-byte boundary.
Yes, the x86 lets you, but Xen doesn't - mostly because it reuses the lower 12 bits as upper bits of the pfn so that you can specify a pagetable base at >4G.
J
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