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

[Jan Beulich <jbeulich@xxxxxxxx>]

On 28.01.2020 15:21, Wei Liu wrote:
> 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>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

I'm sorry for the delay.

Jan

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