[RFC PATCH v1] powerpc/prom_init: disable XIVE in Secure VM.

[David Gibson]

On Wed, Mar 04, 2020 at 04:56:09PM +0100, Cédric Le Goater wrote:
> [ ... ]
> 
> > (1) applied the patch which shares the EQ-page with the hypervisor.
> > (2) set "kernel_irqchip=off"
> > (3) set "ic-mode=xive"
> 
> you don't have to set the interrupt mode. xive should be negotiated
> by default.
> 
> > (4) set "svm=on" on the kernel command line.
> > (5) no changes to the hypervisor and ultravisor.
> > 
> > And Boom it works!.   So you were right.
> 
> Excellent.
>  
> > I am sending out the patch for (1) above ASAP.
> 
> Next step, could you please try to do the same with the TIMA and ESB pfn ?
> and use KVM.

I'm a bit confused by this.  Aren't the TIMA and ESB pages essentially
IO pages, rather than memory pages from the guest's point of view?  I
assume only memory pages are protected with PEF - I can't even really
see what protecting an IO page would even mean.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson
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