linux-kernel - Re: [PATCH 3/9] add frontend implementation for the IOMMU API

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Date:	Fri, 28 Nov 2008 12:31:29 +0100
From:	Joerg Roedel <joerg.roedel@....com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, weidong.han@...el.com,
	mingo@...hat.com, avi@...hat.com, amit.shah@...hat.com
Subject: Re: [PATCH 3/9] add frontend implementation for the IOMMU API

On Fri, Nov 28, 2008 at 06:40:41PM +0900, FUJITA Tomonori wrote:
> On Thu, 27 Nov 2008 16:40:48 +0100
> Joerg Roedel <joerg.roedel@....com> wrote:
> 
> > Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> > ---
> >  drivers/base/iommu.c |   94 ++++++++++++++++++++++++++++++++++++++++++++++++++
> >  1 files changed, 94 insertions(+), 0 deletions(-)
> >  create mode 100644 drivers/base/iommu.c
> > 
> > diff --git a/drivers/base/iommu.c b/drivers/base/iommu.c
> > new file mode 100644
> > index 0000000..7250b9c
> > --- /dev/null
> > +++ b/drivers/base/iommu.c
> 
> Hmm, why is this at drivers/base/? Anyone except for kvm could use
> this? If so, under virt/ is more appropriate?

I don't see a reason why this should be KVM specific. KVM is the only
user for now. But it can be used for i.e. UIO too. Or in drivers to
speed up devices which have bad performance when they do scather gather
IO.

> The majority of the names (include/linux/iommu.h, iommu.c, iommu_ops,
> etc) looks too generic? We already have lots of similar things
> (e.g. arch/{x86,ia64}/asm/iommu.h, several archs' iommu.c, etc). Such
> names are expected to be used by all the IOMMUs.

The API is already useful for more than KVM. I also plan to extend it to
support more types of IOMMUs than VT-d and AMD IOMMU in the future. But
these changes are more intrusive than this patchset and need more
discussion. I prefer to do small steps into this direction.

Joerg

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