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Date:   Fri, 1 May 2020 13:21:57 +0200
From:   Joerg Roedel <joro@8bytes.org>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc:     linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
        jon.grimm@amd.com
Subject: Re: [PATCH] iommu/amd: Fix legacy interrupt remapping for
 x2APIC-enabled system
Message-ID: <20200501112157.GA18423@8bytes.org>
References: <1587562202-14183-1-git-send-email-suravee.suthikulpanit@amd.com>
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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@amd.com>
> ---
>  drivers/iommu/amd_iommu_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Applied for v5.7, thanks Suravee.