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Re: [Xen-devel] Purpose of linear page tables
| To: | Jacob Gorm Hansen <jacobg@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Purpose of linear page tables |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Sat, 2 Apr 2005 08:14:40 +0100 |
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| Delivery-date: | Sat, 02 Apr 2005 07:16:58 +0000 |
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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 |
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