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Date: Thu, 7 May 2020 10:29:42 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Suravee Suthikulpanit <suravee.suthikulpanit@....com>, Joerg Roedel <jroedel@...e.de>, Sasha Levin <sashal@...nel.org>, iommu@...ts.linux-foundation.org Subject: [PATCH AUTOSEL 4.14 15/16] iommu/amd: Fix legacy interrupt remapping for x2APIC-enabled system From: Suravee Suthikulpanit <suravee.suthikulpanit@....com> [ Upstream commit b74aa02d7a30ee5e262072a7d6e8deff10b37924 ] 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@....com> Link: https://lore.kernel.org/r/1587562202-14183-1-git-send-email-suravee.suthikulpanit@amd.com Signed-off-by: Joerg Roedel <jroedel@...e.de> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 4d2920988d607..6c228144b3da5 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -2809,7 +2809,7 @@ 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) { -- 2.20.1
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