Re: [Xen-devel] Xen 4.1 + Linux compiled with PVH == BOOM

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-01-02 at 16:27 -0800, Mukesh Rathor wrote:
> On Mon, 30 Dec 2013 14:56:48 -0500
> Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> 
> > On Tue, Dec 24, 2013 at 01:05:10PM +0000, David Vrabel wrote:
> ......
> > > > 
> > > > The elf parsing should accept unrecognised fields for forward
> > > > compatibility, which would then allow a PV & PVH compiled kernel
> > > > to run in PV mode.
> > > 
> > > It should but it doesn't, so a different way needs to be found for
> > > the kernel to report (optional) PVH support.  A method that is
> > > compatible with older toolstacks.
> > 
> > Also known as changes to the PVH ABI.
> > 
> > Mukesh, Roger, George (emailing Ian instead since he is now the
> > Release Manager-pro-temp), Jan,
> > 
> > a).  That means dropping the 'hvm_callback_vector' check from
> > xc_dom_core.c and just depending on:
> > "writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel"
> > for PVH guests.
> 
> I"m not sure what the state of auto xlated with shadow and Ian's work
> for supervisor mode kernel is. If they are obsolete, then we can drop
> the hvm_callback_vector check.

supervisor mode kernel is a decade old stunt, I don't think it has any
relevance any more -- or at least I've no intention to work on it any
further and no objections to it being removed (I must confess I thought
it already had been...).

Ian.


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