Re: [PATCH v4] device-assignment: Use PCI I/O port sysfs resource file when available

[Marcelo Tosatti <mtosatti@redhat.com>]

On Fri, Jul 23, 2010 at 03:47:18PM -0600, Alex Williamson wrote:
> When supported by the host kernel, we can use read/write on the
> PCI sysfs resource file for I/O port regions.  This allows us to
> avoid raw in/out commands and works with deprivileged guests via
> libvirt.
> 
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> ---
> 
>  Required kernel patch pending here:
>  http://www.spinics.net/lists/linux-pci/msg09389.html
> 
>  v4: Remove commit sentence about uid since we removed the code
>      in v2.  Identical patch to v3.  Also note preliminary
>      agreement to include kerenl patch:
>      http://www.spinics.net/lists/linux-pci/msg09412.html
> 
>  v3: Fixup sysfs errno checking, anything except EINVAL should fall
>      back to in/out.  This covers things like EPERM on the resource
>      file too.
> 
>  v2: Drop getuid() since it doesn't guarantee permissions
>      Don't use in/out as a fallback since we don't have permissions
>      Consolidate ioport read/write functions
> 
>  hw/device-assignment.c |  201 +++++++++++++++++++++++++++---------------------
>  hw/device-assignment.h |    1 
>  2 files changed, 116 insertions(+), 86 deletions(-)

Applied, thanks.