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Re: [Xen-devel] Mapping hvm guest pages in Dom0

To: Satya <satyakiran@xxxxxxxxx>
Subject: Re: [Xen-devel] Mapping hvm guest pages in Dom0
From: "Jean Guyader" <jean.guyader@xxxxxxxxx>
Date: Sat, 27 Sep 2008 01:12:12 +0100
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Fri, Sep 26, 2008 at 8:02 PM, Satya <satyakiran@xxxxxxxxx> wrote:
> hello,
> I would like to map (Read/Write) pages owned by a HVM guest from my Dom0
> Linux kernel module. I have access to the "machine frame numbers" of these
> pages.
> 1. What is the right interface to do this? kmap needs 'struct page' ptrs
> which I doubt exist for pages owned by a HVM guest. Is there a hypercall to
> do this then?

You can use xc_map_foreign_ranges function inside libxc (link with xenctrl).

> 2. Do I need to modify the HVM behavior in any way for this? (e.g., load a
> driver in the guest that will setup grant tables?). I need to keep my guest
> "pure HVM".

You don't need to modify your hvm for doing that.

Jean Guyader

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