Re: [PATCH v14 00/20] Introduce PVH domU support

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Fri, Nov 08, 2013 at 03:41:23PM +0000, George Dunlap wrote:
> On 04/11/13 17:34, Tim Deegan wrote:
> >At 17:23 +0000 on 04 Nov (1383582187), George Dunlap wrote:
> >>On 04/11/13 16:59, Konrad Rzeszutek Wilk wrote:
> >>>>This also means no support for "legacy" forced invalid ops -- only native
> >>>>cpuid is supported in this series.
> >>>OK.
> >>(FWIW, support for legacy forced invalid ops was requested by Tim.)
> >I was worried about existing PV kernel code that used the fake-CPUID,
> >which would break if the 'core' kernel code went from PV to PVH.  But
> >I guess I could be convinced that such kernel code is buggy?  Really,
> >the high-order bit was consistency.  The version I commented on
> >supported them for user-space but not for kernel, which seemed like
> >risking trouble for no benefit.
> 
> Oh right -- I think Mukesh we do need to support forced invalid ops
> for user space so that we can use the same xen tools binaries on PV
> and PVH kernels.
> 
> Hmm, Mukesh / Konrad, what tools are you actually thinking about
> here?  Are these Oracle-specific tools?  I can't seem to find
> XEN_CPUID or XEN_EMULATE_PREFIX anywhere in the tools/ directory of
> the xen repo...

xen/tools/misc/xen-detect.c

> 
>  -George