Re: How to determine memory size in HVM

[Keir Fraser <keir.fraser@eu.citrix.com>]

Hypercall XENMEM_current_reservation.

*But* be aware I'm not sure how that interacts with e.g., virtual
framebuffer memory. Well, actually I know it will include the virtual
framebuffer memory which is not actually really part of normal guest RAM.
The question will be: does the xenstore 'target' value also include it? I
guess you'll have to compare to create a HVM guest and compare the two to
decide.

 -- Keir

On 08/06/2009 15:12, "James Harper" <james.harper@bendigoit.com.au> wrote:

> How can I tell how much memory my VM has under HVM? I want to have
> something concrete to compare the 'target' value in xenstore to for
> ballooning so I am reluctant to ask Windows the question. There seems to
> be a nr_pages in start_info, but HVM doesn't have that...
> 
> My reason for not wanting to ask Windows how much memory is that if it
> says we have 3.5G (reasonable without PAE) and xenstore says we have 4G
> then I'm going to have to fudge things a bit to know whether we are
> ballooning up or down etc.
> 
> I could just read the initial target value from xenstore on boot, but
> even that could be changed before my drivers get to it.
> 
> Thanks
> 
> James
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel