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

[Wei Liu <wl@xxxxxxx>]

On Thu, Feb 20, 2020 at 01:10:56PM +0100, Jan Beulich wrote:
> 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>

Thanks. I have pushed this patch to unblock Hongyan.

Wei.

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