Re: [Xen-devel] [PATCH] direct_remap_pfn_range vm_flags fix

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Feb 2006, at 18:16, Chris Wright wrote:

> * Keir Fraser (Keir.Fraser@xxxxxxxxxxxx) wrote:
> > Possible proper fixes:
> >  1. Don't map local memory via that interface -- only xenstored does
> > this, when mapping dom0's xenbus page. This could be changed.
> This sounds preferable.
>
> >  2. Add a _PAGE_DIRECTMAP flag, just for Xen, that indicates
> > unrefcounted PTEs.
> Unless you have other users of such a flag?
We decided that option (1) was more sane, and that's now checked in as 
c/s 8783. We're not proud of using /dev/kmem to map dom0's xenstore 
page, but that was the only way we could find to use remap_pfn_range() 
and so use a VM_PFNMAP vma for that mapping, as we require. We could 
have made an mmap()able xsd_page device file, but it's not clear that 
is any more tasteful.
 -- Keir


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