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

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> 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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