On Thu, 20 Jun 2024 17:03:09 +0100
Jonathan Cameron <Jonathan.Cameron@huawei.com> wrote:
> The ordering in ACPI specification [1] has bus number in the lowest byte.
> As ACPI tables are little endian this is the reverse of the ordering
> used by PCI_BUILD_BDF(). As a minimal fix split the QEMU BDF up
> into bus and devfn and write them as single bytes in the correct
> order.
>
> [1] ACPI Spec 6.3, Table 5.80
>
> Fixes: 0a5b5acdf2d8 ("hw/acpi: Implement the SRAT GI affinity structure")
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
>
> ---
> v3: New patch. Note this code will go away, so this is intended for
> backporting purposes
> ---
> hw/acpi/acpi_generic_initiator.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/hw/acpi/acpi_generic_initiator.c b/hw/acpi/acpi_generic_initiator.c
> index 17b9a052f5..3d2b567999 100644
> --- a/hw/acpi/acpi_generic_initiator.c
> +++ b/hw/acpi/acpi_generic_initiator.c
> @@ -92,7 +92,8 @@ build_srat_generic_pci_initiator_affinity(GArray *table_data, int node,
>
> /* Device Handle - PCI */
> build_append_int_noprefix(table_data, handle->segment, 2);
> - build_append_int_noprefix(table_data, handle->bdf, 2);
> + build_append_int_noprefix(table_data, PCI_BUS_NUM(handle->bdf), 1);
> + build_append_int_noprefix(table_data, PCI_BDF_TO_DEVFN(handle->bdf), 1);
> for (index = 0; index < 12; index++) {
> build_append_int_noprefix(table_data, 0, 1);
> }