Re: [Xen-devel] [PATCHv11 3/9] kexec: add infrastructure for handling kexec images

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Mon, Nov 18, 2013 at 01:43:35PM +0000, Jan Beulich wrote:
> >>> On 18.11.13 at 14:24, Daniel Kiper <daniel.kiper@xxxxxxxxxx> wrote:
> > On Mon, Nov 18, 2013 at 12:53:39PM +0000, Jan Beulich wrote:
> >
> > [...]
> >
> >> The issue is not a limit on mappable pages, but the fact that there's
> >> potentially no struct page_info for some or all of the crash area.
> >
> > OK, are they allocated at boot time for whole system memory or just
> > for pages owned by Xen hypervsior? What about pages owned by domains?
>
> Sorry, I don't understand the question.

Is struct page_info created for every page of system/machine memory?
Are they created at Xen boot time? Is it possible to create them later
when Xen is runnig?

> > As I can see we access crash region as it was owned by domain. AIUI,
> > it was done in that way because we wanted to be in line with normal
> > kexec case. However, I am not sure right know that this is good idea.
> > Maybe we should do something else in crash dump case?
> >
> > We could establish an limit (4 GiB?) for crash region as a workaround.
>
> Are you taking of a size limit or an address one?

Size.

> > Additionally, it should not overlap with Xen code and/or structures.
>
> That's being guaranteed already afaict.

Yep.

Daniel

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