Re: [Xen-devel] Purpose of linear page tables

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 2 Apr 2005, at 02:47, Jacob Gorm Hansen wrote:

> now that Xen has writable page tables, I was wondering if there is any 
> real need for the linear page tables in Xen? It seems some of the 
> drivers still use them, but I imagine they could use the regular 
> mmu_updates just as efficiently. Am I wrong?
We use update_va_mapping() on demand fault paths as well, where it 
avoids us having to map_domain_mem() the pte in Xen. This would be less 
of an advantage on x86_64 where we'll have a 1:1 mapping of all memory 
anyway: but in that case linear address space is not so scarce. :-)
 - Keir


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel