Re: [Xen-devel] How to reserve Xen's private memory space on guests' page table

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2013-05-01 at 07:09 +0100, Xinxin Jin wrote:
> Hi all,
> 
> 
> I am looking at the paravirtualized memory management and trying to
> understand the page level protection on x86-64. Xen reserve a large
> private space in the middle of the virtual memory space, so I think
> when Xen initialize a new domianU, it should set corresponding
> mappings and access privileges for Xen's private area on domainU's
> initial page tables? However, I did not find where Xen does these
> operations on creating a domain. Can anyone help me solve the
> confusion? A lot of appreciation !! 

init_guest_l4_table seems like the relevant function from what I can
tell.

For 32-bit guests I think create_pae_xen_mappings + usages of
PGT_pae_xen_l2 are what you should be looking at.

Ian.



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