Re: [Qemu-devel] [PATCH v4 for-2.3 10/25] hw/acpi: add support for multiple root busses

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Mar 08, 2015 at 01:16:12PM +0200, Marcel Apfelbaum wrote:
> If the machine has several root busses, we need to add them to
> acpi in order to be properly detected by guests.
> 
> Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
> ---
>  hw/i386/acpi-build.c | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index b94e47e..e5709e8 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -60,6 +60,8 @@
>  #include "qom/qom-qobject.h"
>  #include "exec/ram_addr.h"
>  
> +#include "qmp-commands.h"
> +
>  /* These are used to size the ACPI tables for -M pc-i440fx-1.7 and
>   * -M pc-i440fx-2.0.  Even if the actual amount of AML generated grows
>   * a little bit, there should be plenty of free space since the DSDT
> @@ -682,6 +684,36 @@ build_ssdt(GArray *table_data, GArray *linker,
>      /* Reserve space for header */
>      acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader));
>  
> +    {
> +        PciInfoList *info_list, *info;
> +        Error *err = NULL;
> +
> +        info_list = qmp_query_pci(&err);
> +        if (err) {
> +            error_free(err);
> +            return;
> +        }
> +
> +        for (info = info_list; info; info = info->next) {
> +            PciInfo *bus_info = info->value;
> +
> +            if (bus_info->bus == 0) {
> +                continue;
> +            }
> +
> +            scope = aml_scope("\\_SB");
> +            dev = aml_device("PC%.02X", (uint8_t)bus_info->bus);
> +            aml_append(dev, aml_name_decl("_UID",
> +                aml_string("PC%.02X", (uint8_t)bus_info->bus)));
> +            aml_append(dev, aml_name_decl("_HID", aml_string("PNP0A03")));
> +            aml_append(dev,
> +                aml_name_decl("_BBN", aml_int((uint8_t)bus_info->bus)));

Hmm not all pci buses have hardware-assigned bus numbers,
a separate segment is also an option.
How about only getting your specific ones?


> +            aml_append(scope, dev);
> +            aml_append(ssdt, scope);
> +        }
> +        qapi_free_PciInfoList(info_list);
> +    }
> +
>      scope = aml_scope("\\_SB.PCI0");
>      /* build PCI0._CRS */
>      crs = aml_resource_template();
> -- 
> 2.1.0