Re: [Xen-users] domU page fault handling

[TCHANA Alain <Alain.Tchana@xxxxxxxxxxx>]

Thank you Ian,

I will try with the new version of Xen and come back to you if 
necessary.
Alain


On Mon, 14 Jul 2014 10:02:39 +0100, Ian Campbell wrote:
> On Sat, 2014-07-12 at 05:15 +0200, TCHANA Alain wrote:
> > Hi all,
> >
> > I would like to know where (in Xen or Linux source code) a domU page
> > fault is treated in a Xen (version Xen 4.2).
> 4.2 is quite old to be asking development question of. You should 
> look
> at least at 4.4 and at mainline kernel trees.
>
> >  Is it treated by:
> >
> > 1) the domU operating system do_page_fault() routine, in
> > linux-source-xxx/arch/x86/mm/fault.c.
> > In this case, how does the modification of domU page tables are
> > possible since a domU is not allowed to update them.
> These updates happen via the usual hypercall mechanisms.
>
> > or
> >
> > 2) the hypervisor do_page_fault() routine, in xen/arch/x86/traps.c.
> > In this case, how does the domU maintains its internal page fault
> > stats.
> Xen will take the original h/w page fault here and, if it is for the
> guest, send it onwards by injecting it into the guest.
>
> Ian.

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