RE: [Xen-devel] direct_remap_area_pages() does not work for multiple pages?

[Xin Zhao <zhaoxin@xxxxxxxxxxxxxx>]

Many Thanks for your kind help!

In DomU, I used alloc_pages() to allocate contiguous memory pages,
are they machine contiguous? If not, what's the right way to allocate
machine contiguous pages? or what's the right way to map multiple pages
into Dom0?

Again, thank you in advance for your help!

Xin


On Thu, 10 Feb 2005, Ian Pratt wrote:

>
> > I am trying to use the following code to map multiple pages
> > from a DomU to
> > Dom0, but noticed some weird thing: when I change the content
> > of the first
> > page at Dom0, DomU can see the change, but if I change the content of
> > pages after the first one, DomU cannot see any update. Why? I
> > did check
> > the return value of function direct_remap_area_pages(...),
> > the function
> > should execute succesfully.  This function can only map one
> > page a time? I
> > checked the source code, it should be able to map multiple
> > pages, why I
> > got this weird problem?  Please help!!! Thanks in advance!
>
> Probably because the region you're trying to map is guest
> pseudo-physical contiguous, but not machine contiguous.
>
> Ian
>
>
> > CODE:
> > direct_remap_area_pages(&init_mm, VMALLOC_VMADDR(bufmap_vma->addr),
> >                mapcmd.bufmap_addr << PAGE_SHIFT,
> >                PAGE_SIZE * SVDIF_BUF_PAGES, prot, mapcmd.domid);
> >
> > -x
> >
> >
> >
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