Re: [Xen-devel] [RFC PATCH 00/84] Remove direct map from Xen

[<hongyax@xxxxxxxxxx>]

On 26/09/2019 11:21, Julien Grall wrote:
> Hi,
>
> Thank you for posting the series.
>
> On 9/26/19 10:45 AM, hongyax@xxxxxxxxxx wrote:
> > From: Hongyan Xia <hongyax@xxxxxxxxxx>
> >
> > Previously, Wei Liu has created the patch series to switch to
> > alloc/map/unmap/free APIs for Xen page tables so that Xen page tables
> > are mapped with map_domain_page(). This is the first step towards
> > removing the direct map. I implemented patches on top of Wei's to remove
> > the direct map completely.
> >
> > In addition to Wei's, my patches:
> > - (Wei) implement a proper PMAP infrastructure for bootstrapping
> > - remove direct map code in map_domain_page() and use mapcache, use PMAP
> >   when mapcache not ready
> > - map/unmap xenheap allocations to the direct map region so that va<->pa
> >   macros still work
> > - install dummy mappings (no permissions, INVALID_MFN) instead of actual
> >   1:1 mappings during boot, so the direct map no longer exists
> > - fix many places where code incorrectly assumes a direct map
> I am a bit confused. Are your patches fixing bug from Wei's series?
The goal is to remove the direct map completely from Xen. Wei's series has done 
the first step but was not complete. My additional patches finished the 
remaining steps and removed the direct map.
> > I have moderately tested the patches. I am able to boot into dom0,
> > create/destroy PV/HVM guests and run XTF tests. Personally, I find it
> > difficult to discover all places where it incorrectly assumes a direct
> > map, so reviews and further testing are more than welcome.
> Do you have a branch with this series applied?
I am setting this up. Will send out the link to the branch soon.

> Cheers,

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