linux-kernel - Re: [PATCH] vfio powerpc: enabled on powernv platform

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Date:	Wed, 12 Dec 2012 23:38:57 +1100
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	Alexey Kardashevskiy <aik@...abs.ru>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH] vfio powerpc: enabled on powernv platform

Hi Alex,

I posted other pair of patches. While debugging and testing my stuff I 
implemented some rough hack to support IOMMU mappings without passing those 
hypercalls to the QEMU, this is why I moved pieces of code around - want to 
support both QEMU-VFIO and kernel optimized H_PUT_TCE handler.



On 12/12/12 23:34, Alexey Kardashevskiy wrote:
> This patch initializes IOMMU groups based on the IOMMU
> configuration discovered during the PCI scan on POWERNV
> (POWER non virtualized) platform. The IOMMU groups are
> to be used later by VFIO driver (PCI pass through).
>
> It also implements an API for mapping/unmapping pages for
> guest PCI drivers and providing DMA window properties.
> This API is going to be used later by QEMU-VFIO to handle
> h_put_tce hypercalls from the KVM guest.
>
> Although this driver has been tested only on the POWERNV
> platform, it should work on any platform which supports
> TCE tables.
>
> To enable VFIO on POWER, enable SPAPR_TCE_IOMMU config
> option and configure VFIO as required.
>
> Cc: David Gibson <david@...son.dropbear.id.au>
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> ---


-- 
Alexey
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