Re: [Qemu-devel] [for-4.0 PATCH v3 9/9] pcie: Fast PCIe root ports for new machines

[Alex Williamson <alex.williamson@redhat.com>]

On Tue, 04 Dec 2018 09:27:28 -0700
Alex Williamson <alex.williamson@redhat.com> wrote:

> Change the default speed and width for new machine types to the
> fastest and widest currently supported.  This should be compatible to
> the PCIe 4.0 spec.  Pre-QEMU-4.0 machine types remain at 2.5GT/s, x1
> width.
> 
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> ---
>  hw/pci-bridge/gen_pcie_root_port.c |    4 ++--
>  include/hw/compat.h                |   10 +++++++++-
>  2 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/pci-bridge/gen_pcie_root_port.c b/hw/pci-bridge/gen_pcie_root_port.c
> index ca5418a89dd2..9766edb44596 100644
> --- a/hw/pci-bridge/gen_pcie_root_port.c
> +++ b/hw/pci-bridge/gen_pcie_root_port.c
> @@ -125,9 +125,9 @@ static Property gen_rp_props[] = {
>      DEFINE_PROP_SIZE("pref64-reserve", GenPCIERootPort,
>                       res_reserve.mem_pref_64, -1),
>      DEFINE_PROP_PCIE_LINK_SPEED("x-speed", PCIESlot,
> -                                speed, PCIE_LINK_SPEED_2_5),
> +                                speed, PCIE_LINK_SPEED_16),
>      DEFINE_PROP_PCIE_LINK_WIDTH("x-width", PCIESlot,
> -                                width, PCIE_LINK_WIDTH_1),
> +                                width, PCIE_LINK_WIDTH_32),
>      DEFINE_PROP_END_OF_LIST()
>  };
>  
> diff --git a/include/hw/compat.h b/include/hw/compat.h
> index 70958328fe7a..702cc62277db 100644
> --- a/include/hw/compat.h
> +++ b/include/hw/compat.h
> @@ -2,7 +2,15 @@
>  #define HW_COMPAT_H
>  
>  #define HW_COMPAT_3_1 \
> -    /* empty */
> +    {\
> +        .driver   = "pcie-root-port",\
> +        .property = "speed",\
> +        .value    = "2_5",\
> +    },{\
> +        .driver   = "pcie-root-port",\
> +        .property = "width",\
> +        .value    = "1",\
> +    },

Whoops, these should be x-speed and x-width too.  Will correct.  Thanks,

Alex

>  #define HW_COMPAT_3_0 \
>      /* empty */
>