Re: [Xen-devel] [PATCH 3 of 4] xen/pagetables: Document that all of the initial regions are mapped

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.08.12 at 22:08, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> # HG changeset patch
> # User Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> # Date 1345579709 14400
> # Node ID 74bedb086c5b72447262e087c0218b89f8bc9140
> # Parent  8ed3eef706710c9c476a8d984bfb2861d92bedfb
> xen/pagetables: Document that all of the initial regions are mapped.
> 
> The documentation states that the layout of the initial region looks
> as so:
>    a. relocated kernel image
>    b. initial ram disk              [mod_start, mod_len]
>    c. list of allocated page frames [mfn_list, nr_pages]
>       (unless relocated due to XEN_ELFNOTE_INIT_P2M)
>    d. start_info_t structure        [register ESI (x86)]
>    e. bootstrap page tables         [pt_base, CR3 (x86)]
>    f. bootstrap stack               [register ESP (x86)]
> 
> But it does not clarify that the virtual address to all of
> those areas is initially mapped by the pt_base (or CR3).
> Lets fix that.

To me this is already being said by "This the order of bootstrap
elements in the initial virtual region".

Jan

> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> 
> diff -r 8ed3eef70671 -r 74bedb086c5b xen/include/public/xen.h
> --- a/xen/include/public/xen.h        Tue Aug 21 16:08:29 2012 -0400
> +++ b/xen/include/public/xen.h        Tue Aug 21 16:08:29 2012 -0400
> @@ -675,6 +675,9 @@ typedef struct shared_info shared_info_t
>   *  8. There is guaranteed to be at least 512kB padding after the final
>   *     bootstrap element. If necessary, the bootstrap virtual region is
>   *     extended by an extra 4MB to ensure this.
> + *
> + *  NOTE: The initial virtual region (3a -> 3f) are all mapped by the initial
> + *  pagetables [pt_base, CR3 (x86)].
>   */
>  
>  #define MAX_GUEST_CMDLINE 1024
> 
> 
> 
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