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Re: [Qemu-devel] [PATCH qemu v7 07/14] spapr_iommu: Add root memory regi

From: David Gibson
Subject: Re: [Qemu-devel] [PATCH qemu v7 07/14] spapr_iommu: Add root memory region
Date: Tue, 5 May 2015 22:31:25 +1000
User-agent: Mutt/1.5.23 (2014-03-12)

On Sat, Apr 25, 2015 at 10:24:37PM +1000, Alexey Kardashevskiy wrote:
> We are going to have multiple DMA windows at different offsets on
> a PCI bus. For the sake of migration, we will have as many TCE table
> objects pre-created as many windows supported.
> So we need a way to map windows dynamically onto a PCI bus
> when migration of a table is completed but at this stage a TCE table
> object does not have access to a PHB to ask it to map a DMA window
> backed by just migrated TCE table.
> This adds a "root" memory region (UINT64_MAX long) to the TCE object.
> This new region is mapped on a PCI bus with enabled overlapping as
> there will be one root MR per TCE table, each of them mapped at 0.
> The actual IOMMU memory region is a subregion of the root region and
> a TCE table enables/disables this subregion and maps it at
> the specific offset inside the root MR which is 1:1 mapping of
> a PCI address space.
> Signed-off-by: Alexey Kardashevskiy <address@hidden>

Reviewed-by: David Gibson <address@hidden>

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_!

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