Re: [Xen-devel] [PATCH v6] x86: introduce a new set of APIs to manage Xen page tables

[Wei Liu <wl@xxxxxxx>]

On Tue, Jan 28, 2020 at 01:50:05PM +0000, Hongyan Xia wrote:
> From: Wei Liu <wei.liu2@xxxxxxxxxx>
> 
> We are going to switch to using domheap page for page tables.
> A new set of APIs is introduced to allocate and free pages of page
> tables based on mfn instead of the xenheap direct map address. The
> allocation and deallocation work on mfn_t but not page_info, because
> they are required to work even before frame table is set up.
> 
> Implement the old functions with the new ones. We will rewrite, site
> by site, other mm functions that manipulate page tables to use the new
> APIs.
> 
> After the allocation, one needs to map and unmap via map_domain_page to
> access the PTEs. This does not break xen half way, since the new APIs
> still use xenheap pages underneath, and map_domain_page will just use
> the directmap for mappings. They will be switched to use domheap and
> dynamic mappings when usage of old APIs is eliminated.
> 
> No functional change intended in this patch.
> 
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> Signed-off-by: Hongyan Xia <hongyxia@xxxxxxxxxx>
> Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>

Reviewed-by: Wei Liu <wl@xxxxxxx>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel