tree 578b9bb14d34b7627274bf788bbc216fe71e9f36
parent b454d754cb174bbb15fdfb2aab82bdc1d3248253
author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> 1587562202 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1588745611 +0200

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

commit b74aa02d7a30ee5e262072a7d6e8deff10b37924 upstream.

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@amd.com>
Link: https://lore.kernel.org/r/1587562202-14183-1-git-send-email-suravee.suthikulpanit@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>