Re: [PATCH 2/6] KVM: PPC: Add support for multiple-TCE hcalls

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, May 06, 2013 at 05:25:53PM +1000, Alexey Kardashevskiy wrote:
> This adds real mode handlers for the H_PUT_TCE_INDIRECT and
> H_STUFF_TCE hypercalls for QEMU emulated devices such as virtio
> devices or emulated PCI.  These calls allow adding multiple entries
> (up to 512) into the TCE table in one call which saves time on
> transition to/from real mode.
> 
> This adds a guest physical to host real address converter
> and calls the existing H_PUT_TCE handler. The converting function
> is going to be fully utilized by upcoming VFIO supporting patches.
> 
> This also implements the KVM_CAP_PPC_MULTITCE capability,
> so in order to support the functionality of this patch, QEMU
> needs to query for this capability and set the "hcall-multi-tce"
> hypertas property only if the capability is present, otherwise
> there will be serious performance degradation.
> 
> Cc: David Gibson <david@gibson.dropbear.id.au>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> Signed-off-by: Paul Mackerras <paulus@samba.org>

Fwiw, it would be nice to get this patch merged, regardless of the
rest of the VFIO/powerpc patches.

-- 
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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