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Commit a6d4fb7c authored by Suravee Suthikulpanit's avatar Suravee Suthikulpanit Committed by Greg Kroah-Hartman
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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: 3928aa3f ("iommu/amd: Detect and enable guest vAPIC support")
Signed-off-by: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/1587562202-14183-1-git-send-email-suravee.suthikulpanit@amd.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f9980f56

drivers/iommu/amd_iommu_init.c

+1 −1
Original line number Diff line number Diff line
@@ -2574,7 +2574,7 @@ static int __init parse_amd_iommu_intr(char *str) 
{

	for (; *str; ++str) {

		if (strncmp(str, "legacy", 6) == 0) {

			amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;

			amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;

			break;

		}

		if (strncmp(str, "vapic", 5) == 0) {