RE: [Xen-devel] Regressions in v3.3-rc1 introduced by"xen/granttable: Grant tables V2 implementation"

[Paul Durrant]

> -----Original Message-----
> From: Paul Durrant
> Sent: 25 January 2012 07:17
> To: Ian Campbell; Konrad Rzeszutek Wilk
> Cc: annie.li@xxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] Regressions in v3.3-rc1 introduced by
> "xen/granttable: Grant tables V2 implementation"
> 
> > -----Original Message-----
> >
> > On HVM for gnttab_shared we make an add_to_physmap call with
> > XENMAPSPACE_grant_table (in gnttab_map). I don't see any support call
> > to do something similar for the status array though and I don't see a
> > XENMAPSPACE_* specifically for that case either in the hypervisor either.
> >
> 
> There is no map-space for the status pages. To map them you use the
> standard map space but OR a bit (top bit IIRC) into in the idx. It's a bit icky,
> but that's how it is.
> 

I fixed a bug in xen-unstable a few weeks back that prevented mapping of the status frames so I guess the bug is possibly due to trying to use gnttab 2 on 4.1, where this bug would hit, but failing to check the return code from the status mapping hypercall?

  Paul
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