Re: [Xen-devel] XENMAPSPACE_vlapic vs XENMAPSPACE_vlapic_compat

[James Harper <james.harper@xxxxxxxxxxxxxxxx>]

> 
> On 01/10/2013 23:39, James Harper wrote:
> > GPLPV tries to map vlapic for TPR acceleration. Under what
> circumstances/versions are XENMAPSPACE_vlapic and
> XENMAPSPACE_vlapic_compat supported or not supported?
> >
> > Thanks
> >
> > James
> 
> Short answer: not at all.
> Long answer: will continue to work on XenServer for the forseeable
> future for compatibility with our older windows drivers.
> 
> Both of them were gross XenServer hacks to solve the WinXP TPR
> performance problem on hardware without vTPR, and never upstreamed.
> 
> XENMAPSPACE_vlapic_compat (defined as 3) became a binary
> incompatibility
> with Xen 4.2 with the introduction of XENMAPSPACE_gmfn_range
> 

When I try and map it, it fails with -EINVAL, and then crashes the DomU shortly 
after (xen 4.3.1). I'll remove that code from GPLPV.

I wonder why I thought it was supported?

James

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