Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 8 Feb 2016 16:46:08 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH v2 3/3] paravirt: rename paravirt_enabled to paravirt_legacy |
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On Mon, Feb 08, 2016 at 10:31:36AM -0500, Boris Ostrovsky wrote: > This range is reserved for hypervisors but the only hypervisor that uses it > is Xen PV (lguest doesn't run in 64-bit mode).
Yeah, this is mentioned in arch/x86/include/asm/page_64_types.h:
/* * Set __PAGE_OFFSET to the most negative possible address + * PGDIR_SIZE*16 (pgd slot 272). The gap is to allow a space for a * hypervisor to fit. Choosing 16 slots here is arbitrary, but it's * what Xen requires. */ #define __PAGE_OFFSET _AC(0xffff880000000000, UL)
It is also in Documentation/x86/x86_64/mm.txt:
ffff800000000000 - ffff87ffffffffff (=43 bits) guard hole, reserved for hypervisor
albeit a bit laconic.
Thanks.
-- Regards/Gruss, Boris.
ECO tip #101: Trim your mails when you reply.
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