linux-kernel - RE: [PATCH 0/2] iommu/amd: Fix IOMMUv2 devices when SME is active

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Date:   Sun, 6 Sep 2020 16:08:58 +0000
From:   "Deucher, Alexander" <Alexander.Deucher@....com>
To:     Joerg Roedel <joro@...tes.org>
CC:     "jroedel@...e.de" <jroedel@...e.de>,
        "Kuehling, Felix" <Felix.Kuehling@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "Huang, Ray" <Ray.Huang@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/2] iommu/amd: Fix IOMMUv2 devices when SME is active

[AMD Official Use Only - Internal Distribution Only]

> -----Original Message-----
> From: Joerg Roedel <joro@...tes.org>
> Sent: Friday, September 4, 2020 6:06 AM
> To: Deucher, Alexander <Alexander.Deucher@....com>
> Cc: jroedel@...e.de; Kuehling, Felix <Felix.Kuehling@....com>;
> iommu@...ts.linux-foundation.org; Huang, Ray <Ray.Huang@....com>;
> Koenig, Christian <Christian.Koenig@....com>; Lendacky, Thomas
> <Thomas.Lendacky@....com>; Suthikulpanit, Suravee
> <Suravee.Suthikulpanit@....com>; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 0/2] iommu/amd: Fix IOMMUv2 devices when SME is
> active
>
> On Fri, Aug 28, 2020 at 03:47:07PM +0000, Deucher, Alexander wrote:
> > Ah, right,  So CZ and ST are not an issue.  Raven is paired with Zen based
> CPUs.
>
> Okay, so for the Raven case, can you add code to the amdgpu driver which
> makes it fail to initialize on Raven when SME is active? There is a global
> checking function for that, so that shouldn't be hard to do.
>

Sure.  How about the attached patch?

Alex


View attachment "0001-drm-amdgpu-Fail-to-load-on-RAVEN-if-SME-is-active.patch" of type "text/x-patch" (1438 bytes)