On Fri, 23 Oct 2020, Julien Grall wrote:
> From: Julien Grall <julien.gr...@arm.com>
>
> At the moment Xen requires the FADT ACPI table to be at least version
> 6.0, apparently because of some reliance on other ACPI v6.0 features.
>
> But actually this is overzealous, and Xen works now fine with ACPI v5.1.
>
> Let's relax the version check for the FADT table to allow QEMU to
> run the hypervisor with ACPI.
>
> Signed-off-by: Julien Grall <julien.gr...@arm.com>
> Signed-off-by: Andre Przywara <andre.przyw...@arm.com>
> Signed-off-by: Julien Grall <jgr...@amazon.com>
Acked-by: Stefano Stabellini <sstabell...@kernel.org>
> ---
> Changes in v2:
> - Patch added
> ---
> xen/arch/arm/acpi/boot.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
> index 55c3e5cbc834..7ea2990cb82c 100644
> --- a/xen/arch/arm/acpi/boot.c
> +++ b/xen/arch/arm/acpi/boot.c
> @@ -181,8 +181,8 @@ static int __init acpi_parse_fadt(struct
> acpi_table_header *table)
> * we only deal with ACPI 6.0 or newer revision to get GIC and SMP
> * boot protocol configuration data, or we will disable ACPI.
> */
> - if ( table->revision > 6
> - || (table->revision == 6 && fadt->minor_revision >= 0) )
> + if ( table->revision > 5
> + || (table->revision == 5 && fadt->minor_revision >= 1) )
> return 0;
>
> printk("Unsupported FADT revision %d.%d, should be 6.0+, will disable
> ACPI\n",
> --
> 2.17.1
>
