Xen devel - Oct 2007 - [PATCH] Align PCI memory regions to page size (4K) (Dom-0 Patch)

Add a boot parameter to Dom-0 kernel (''pci-mem-align'') which
forces PCI
memory regions to be aligned to 4K. 

In PCI pass-through the mmio resources are mapped/translated from pfns
to mfns (page size), so mmio resources should be at least page-aligned
---
Applies to changeset 154 of the linux-2.6.18-xen.hg repository
---
Signed-off-by: Barak Fargoun     (barak@neocleus.com)
 
 
 


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On 30/10/07 16:34, "Barak Fargoun" <barak@neocleus.com> wrote:
> Add a boot parameter to Dom-0 kernel (''pci-mem-align'')
which forces PCI
> memory regions to be aligned to 4K.
> 
> In PCI pass-through the mmio resources are mapped/translated from pfns
> to mfns (page size), so mmio resources should be at least page-aligned
The only resources you''re changing in this patch are the software
resource
lists that Linux maintains, presumably for diagnostics and to detect
resource conflicts. No actual PCI BARs seem to change, or anything like
that. So I don''t see how this would fix anything. Actually I''m
not even
entirely clear what the problem is.

 -- Keir



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