Re: [Xen-devel] dom0 pvops crash

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2010-02-08 at 07:41 +0000, Pasi Kärkkäinen wrote: 
> On Sun, Feb 07, 2010 at 02:22:15PM -0800, Daniel Stodden wrote:
> > On Sun, 2010-02-07 at 16:42 -0500, Ian Campbell wrote:
> > > On Sun, 2010-02-07 at 19:35 +0000, Pasi Kärkkäinen wrote: 
> > > > On Wed, Jan 27, 2010 at 05:26:13PM +0000, Ian Campbell wrote:
> > > > > diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
> > > > > index 65215ab..49f8e83 100644
> > > > > --- a/arch/x86/mm/pgtable.c
> > > > > +++ b/arch/x86/mm/pgtable.c
> > > > > @@ -28,7 +28,10 @@ pgtable_t pte_alloc_one(struct mm_struct *mm, 
> > > > > unsigned long address)
> > > > >       struct page *pte;
> > > > >  
> > > > >  #ifdef CONFIG_HIGHPTE
> > > > > -     pte = alloc_pages(PGALLOC_GFP | __GFP_HIGHMEM, 0);
> > > > > +     if (is_xen_domain())
> > > > > +             pte = alloc_pages(PGALLOC_GFP, 0);
> > > > > +     else
> > > > > +             pte = alloc_pages(PGALLOC_GFP | __GFP_HIGHMEM, 0);
> > > > >  #else
> > > > >       pte = alloc_pages(PGALLOC_GFP, 0);
> > > > >  #endif
> > > > > 
> > > > 
> > > > I just tried this patch, but it fails to compile:
> > > > 
> > > > arch/x86/mm/pgtable.c: In function 'pte_alloc_one':
> > > > arch/x86/mm/pgtable.c:19: error: implicit declaration of function 
> > > > 'is_xen_domain'
> > > > make[2]: *** [arch/x86/mm/pgtable.o] Error 1
> > > > make[1]: *** [arch/x86/mm] Error 2
> > > > make: *** [arch/x86] Error 2
> > > > 
> > > > I tried grepping around for that function but didn't find it from any 
> > > > header..
> > > 
> > > IIRC on some kernels it was called just xen_domain(), I'm not sure but I
> > > think my patch was against plain 2.6.32. I think the function (whatever
> > > it is called) also moved around in the headers recently.
> > 
> > is_running_on_xen()
> > 
> 
> I'm using kernel.org 2.6.32.7, and I can't find is_running_on_xen() either.

2.6.32.7 has xen_domain() defined in include/xen/xen.h. Probably
xen_pv_domain() is the correct check though.

Ian.


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