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Wed, 26 Aug 2020 14:23:44 +0000 From: "Deucher, Alexander" To: Joerg Roedel , "iommu@lists.linux-foundation.org" , "Kuehling, Felix" , "Koenig, Christian" CC: "jroedel@suse.de" , "Lendacky, Thomas" , "Suthikulpanit, Suravee" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH 1/2] iommu/amd: Do not force direct mapping when SME is active Thread-Topic: [PATCH 1/2] iommu/amd: Do not force direct mapping when SME is active Thread-Index: AQHWegTsBj7N+qef/0+36KKtrMBTq6lKc7sQ Date: Wed, 26 Aug 2020 14:23:44 +0000 Message-ID: References: <20200824105415.21000-1-joro@8bytes.org> <20200824105415.21000-2-joro@8bytes.org> In-Reply-To: <20200824105415.21000-2-joro@8bytes.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_0d814d60-469d-470c-8cb0-58434e2bf457_Enabled=true; MSIP_Label_0d814d60-469d-470c-8cb0-58434e2bf457_SetDate=2020-08-26T14:20:54Z; MSIP_Label_0d814d60-469d-470c-8cb0-58434e2bf457_Method=Privileged; MSIP_Label_0d814d60-469d-470c-8cb0-58434e2bf457_Name=Public_0; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB4488.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c78fe514-f17a-40ff-10f3-08d849cba3d2 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Aug 2020 14:23:44.7551 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: GdhocXPeA7wM8mdLWj+2ZEKi9uzwCkS5WCekyW1NMMzkrzkATJVUuHHNuDKatV2wo26mJAq6ahGXd+S6zTbEKQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4472 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [AMD Public Use] + Felix, Christian > -----Original Message----- > From: Joerg Roedel > Sent: Monday, August 24, 2020 6:54 AM > To: iommu@lists.linux-foundation.org > Cc: Joerg Roedel ; jroedel@suse.de; Lendacky, Thomas > ; Suthikulpanit, Suravee > ; Deucher, Alexander > ; linux-kernel@vger.kernel.org > Subject: [PATCH 1/2] iommu/amd: Do not force direct mapping when SME is > active >=20 > From: Joerg Roedel >=20 > Do not force devices supporting IOMMUv2 to be direct mapped when > memory encryption is active. This might cause them to be unusable because > their DMA mask does not include the encryption bit. >=20 > Signed-off-by: Joerg Roedel > --- > drivers/iommu/amd/iommu.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) >=20 > diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c > index ba9f3dbc5b94..77e4268e41cf 100644 > --- a/drivers/iommu/amd/iommu.c > +++ b/drivers/iommu/amd/iommu.c > @@ -2659,7 +2659,12 @@ static int amd_iommu_def_domain_type(struct > device *dev) > if (!dev_data) > return 0; >=20 > - if (dev_data->iommu_v2) > + /* > + * Do not identity map IOMMUv2 capable devices when memory > encryption is > + * active, because some of those devices (AMD GPUs) don't have the > + * encryption bit in their DMA-mask and require remapping. > + */ I think on the integrated GPUs in APUs I'd prefer to have the identity mapp= ing over SME, but I guess this is fine because you have to explicitly enabl= e SME and if you do that you know what you are getting into. Alex > + if (!mem_encrypt_active() && dev_data->iommu_v2) > return IOMMU_DOMAIN_IDENTITY; >=20 > return 0; > -- > 2.28.0