When does Xen build 1:1 direct mapping of all physical memory ?

When does Xen build 1:1 direct mapping of all physical memory ?

[Xinxin Jin]

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Hi, all,
I assumed that Xen fills up the page table entires for 1:1 direct mapping
of all physical memory at start time, but I cannot find the code. Could
anyone tell me when Xen builds up pte for this mapping ?
Thanks,
-- 
Xinxin

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Re: When does Xen build 1:1 direct mapping of all physical memory ?

[Jan Beulich]

>>> On 25.02.13 at 20:51, Xinxin Jin <xinxinjin89@gmail.com> wrote:
> I assumed that Xen fills up the page table entires for 1:1 direct mapping
> of all physical memory at start time, but I cannot find the code. Could
> anyone tell me when Xen builds up pte for this mapping ?

xen/arch/x86/mm.c:init_frametable()

Jan

Re: When does Xen build 1:1 direct mapping of all physical memory ?

[Xinxin Jin]

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Hi Jan, I think init_frametable() is to initialize frame table, whose
virtual address starts at FRAMETABLE_VIRT_START ? How about the direct 1:1
mapping of all of machine memroy whose virtual address start at
DIRECTMAP_VIRT_START?
Thanks,

On Tue, Feb 26, 2013 at 12:31 AM, Jan Beulich <JBeulich@suse.com> wrote:

> >>> On 25.02.13 at 20:51, Xinxin Jin <xinxinjin89@gmail.com> wrote:
> > I assumed that Xen fills up the page table entires for 1:1 direct mapping
> > of all physical memory at start time, but I cannot find the code. Could
> > anyone tell me when Xen builds up pte for this mapping ?
>
> xen/arch/x86/mm.c:init_frametable()
>
> Jan
>
>


-- 
Xinxin

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Re: When does Xen build 1:1 direct mapping of all physical memory ?

[Jan Beulich]

>>> On 26.02.13 at 23:23, Xinxin Jin <xinxinjin89@gmail.com> wrote:
> Hi Jan, I think init_frametable() is to initialize frame table, whose
> virtual address starts at FRAMETABLE_VIRT_START ? How about the direct 1:1
> mapping of all of machine memroy whose virtual address start at
> DIRECTMAP_VIRT_START?

Oh, sorry, yes, this isn't the direct mapping.

Check the calls to map_pages_to_xen() in __start_xen() for the
direct mapping.

Jan