linux-kernel - Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

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Message-ID: <1372046300.3944.131.camel@pasglop>
Date:	Mon, 24 Jun 2013 13:58:20 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Gibson <david@...son.dropbear.id.au>
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Alexander Graf <agraf@...e.de>, linuxppc-dev@...ts.ozlabs.org,
	Paul Mackerras <paulus@...ba.org>,
	"kvm@...r.kernel.org mailing list" <kvm@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	kvm-ppc@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>,
	Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

On Mon, 2013-06-24 at 13:54 +1000, David Gibson wrote:
> > DDW means an API by which the guest can request the creation of
> > additional iommus for a given device (typically, in addition to the
> > default smallish 32-bit one using 4k pages, the guest can request
> > a larger window in 64-bit space using a larger page size).
> 
> So, would a PAPR gest requesting this expect the new window to have
> a new liobn, or an existing liobn?

New liobn or there is no way to H_PUT_TCE it (it exists in addition
to the legacy window).

Cheers,
Ben.


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