[SeaBIOS] [PATCH V3 0/2] hw/pci: reserve IO and mem for pci-2-pci bridges with no devices attached
Michael S. Tsirkin
mst at redhat.com
Thu Apr 10 17:49:19 CEST 2014
On Thu, Apr 10, 2014 at 04:29:39PM +0300, Marcel Apfelbaum wrote:
> v2 -> v3:
> - Addressed Michael S. Tsirkin's comments:
> - I/O and Prefetchable Memory are optional. Do not allocate ranges
> if they are not implemented (2/2).
> - Note that 2/2 patch can be seen as a separate fix. However, it
> is related to ranges reservation.
>
> v1 -> v2:
> - Thanks Gerd Hoffmann for the review.
> - Addressed Michael S. Tsirkin's comments:
> - Limit capabilities query to 256 iterations, to make sure we
> don't get into an infinite loop with a broken device.
>
An additional possible enhancement would be to avoid allocating
for devices that are behind a non IO forwarding bridge.
Can be a patch on top.
> If a pci-2-pci bridge supports hot-plug functionality but there are no devices
> connected to it, reserve IO/mem in order to be able to attach devices
> later. Do not waste space, use minimum allowed.
>
> Marcel Apfelbaum (2):
> hw/pci: reserve IO and mem for pci-2-pci bridges with no devices
> attached
> hw/pci: check if pci2pci bridges implement optional limit registers
>
> src/fw/pciinit.c | 12 +++++-----
> src/hw/pci.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> src/hw/pci.h | 10 +++++++++
> 3 files changed, 82 insertions(+), 7 deletions(-)
>
> --
> 1.8.3.1
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