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Re: [Xen-devel] PAE, Elf headers, and Extended CR3 registers
| To: | Randy Thelen <rthelen@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] PAE, Elf headers, and Extended CR3 registers |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Sat, 16 Sep 2006 17:04:32 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Sat, 16 Sep 2006 09:14:29 -0700 |
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| Thread-index: | AcbZqcvjCrX46UWdEduRKQANk04WTA== |
| Thread-topic: | [Xen-devel] PAE, Elf headers, and Extended CR3 registers |
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On 15/9/06 8:40 pm, "Randy Thelen" <rthelen@xxxxxxxxxx> wrote: > My concern had been that 'extended CR3' implied hardware support for > a 64 bit CR3 register. Instead it means that I shouldn't really care > if the mfn of my Page Table Directory Pointer is above 4GB, Xen will > handle the condition for me. And, the way I'll decode the mfn, if > necessary (which I would agree should be rare), would be with those > macros. Yes, that's correct. You *must* decode/encode any CR3 value passed to/from Xen using those macros or you simply will not work properly on >4GB systems. Luckily, as I pointed out for Linux, this will probably only be an issue you come across when initialising secondary VCPUs. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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