Messages in this thread Patch in this message | | | From | Suravee Suthikulpanit <> | Subject | [PATCH] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system | Date | Wed, 22 Apr 2020 08:30:02 -0500 |
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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> --- drivers/iommu/amd_iommu_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 6be3853..2b9a67e 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2936,7 +2936,7 @@ 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) { -- 1.8.3.1
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