Re: [Xen-devel] Trouble using update_va_mapping

[Mathieu Ropert <mro@xxxxxxxxxx>]

Keir Fraser wrote:

> On 13 Feb 2006, at 16:06, Mathieu Ropert wrote:
>
> > i'm trying to run a very simple domU kernel on Xen/x86_64, and i'm 
> > getting some trouble with update_va_mapping(): when trying to remap 
> > some page table entry, i find the virtual address still pointing to 
> > the same machine address after the return of the hypercall.
>
> What machine page does 'cons' point at before update_va_mapping()? Is 
> it definitely a different page?
>  -- Keir
Done some more checks and found the bug: the virtual address i used was 
mis-aligned  (missing a 0x in .align directive :)).
How does update_va_mapping() should normally behave when given a non 
paged-aligned virtual address? From the code, i guess it just remap the 
page containing the given address (discarding the lower 12 bits). Is 
this intended?
Mathieu


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