Re: [Xen-devel] Max gfn?

[Keir Fraser <keir@xxxxxxx>]

On 09/03/2012 05:56, "AP" <apxeng@xxxxxxxxx> wrote:

> I have a 12GB 64-bit Linux HVM guest (CentOS 5.5). When I look at the
> e820 map in the guest, I see the following:
> 
> BIOS-provided physical RAM map:
>  BIOS-e820: 0000000000010000 - 000000000009e000 (usable)
>  BIOS-e820: 000000000009e000 - 00000000000a0000 (reserved)
>  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
>  BIOS-e820: 0000000000100000 - 00000000f0000000 (usable)
>  BIOS-e820: 00000000fc000000 - 0000000100000000 (reserved)
>  BIOS-e820: 0000000100000000 - 000000030f000000 (usable)
> 
> I see that the highest usable gpa is over 12GB due to the reserved
> slots and the max gfn is 30f000.  If I use xc_domain_getinfolist() and
> look at max_pages, it returns 300100 which correctly reflects 12GB.
> But is there a way for me to find out the max gfn that is reflected in
> the guest using libxc?

xc_domain_maximum_gpfn() returns a value guaranteed to be >= the current
maximum gpfn in the guests physical address space.

 -- Keir

> Thanks,
> AP
> 
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> http://lists.xen.org/xen-devel



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