* Purpose of linear page tables
@ 2005-04-02 1:47 Jacob Gorm Hansen
2005-04-02 7:14 ` Keir Fraser
0 siblings, 1 reply; 2+ messages in thread
From: Jacob Gorm Hansen @ 2005-04-02 1:47 UTC (permalink / raw)
To: xen-devel
hi,
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?
Jacob
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Purpose of linear page tables
2005-04-02 1:47 Purpose of linear page tables Jacob Gorm Hansen
@ 2005-04-02 7:14 ` Keir Fraser
0 siblings, 0 replies; 2+ messages in thread
From: Keir Fraser @ 2005-04-02 7:14 UTC (permalink / raw)
To: Jacob Gorm Hansen; +Cc: xen-devel
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
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