Re: [Xen-devel] Seabios hypercall page

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jun 12, 2017 at 11:17:25AM +0200, Juergen Gross wrote:
> While searching for the reason for a HVM domU performance problem
> I came across Seabios' hypercall page: it is usually located at the
> end of guest memory and marked as "reserved" in the guest E820 map.
> 
> This will make it impossible for a Linux guest to use a large page
> mapping for the direct map of memory for the last memory chunk.
> 
> Would it be possible to put the hypercall page into low memory?
> There seems to be plenty of space below 1MB according to /proc/iomem:

The changeset that added xen support doesn't say why high address was
chosen. I suppose you can move it else where just fine.

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