[PATCH] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system

[Joerg Roedel]

On Wed, Apr 22, 2020 at 08:30:02AM -0500, Suravee Suthikulpanit wrote:
> Currently, system fails to boot because the legacy interrupt remapping
> mode does not enable 128-bit IRTE (GA), which is required for x2APIC
> support.
> 
> Fix by using AMD_IOMMU_GUEST_IR_LEGACY_GA mode when booting with
> kernel option amd_iommu_intr=legacy instead. The initialization
> logic will check GASup and automatically fallback to using
> AMD_IOMMU_GUEST_IR_LEGACY if GA mode is not supported.
> 
> Fixes: 3928aa3f5775 ("iommu/amd: Detect and enable guest vAPIC support")
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit at amd.com>
> ---
>  drivers/iommu/amd_iommu_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied for v5.7, thanks Suravee.