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Wed, 23 Sep 2020 14:29:13 +0000 From: Adrian Huang12 To: Baoquan He , "joro@8bytes.org" CC: "iommu@lists.linux-foundation.org" , "linux-kernel@vger.kernel.org" , "jsnitsel@redhat.com" Subject: RE: [External] Re: [PATCH] Revert "iommu/amd: Treat per-device exclusion ranges as r/w unity-mapped regions" Thread-Topic: [External] Re: [PATCH] Revert "iommu/amd: Treat per-device exclusion ranges as r/w unity-mapped regions" Thread-Index: AQHWkVHq0K7SmrxgEESssWwoSA9vZql2Ra7g Date: Wed, 23 Sep 2020 14:29:13 +0000 Message-ID: References: <20200923022655.750-1-bhe@redhat.com> <20200923023244.GK25604@MiWiFi-R3L-srv> In-Reply-To: <20200923023244.GK25604@MiWiFi-R3L-srv> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2001:b011:e002:1525:8075:eff5:54cb:a51c] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 56c16a34-9586-4f38-f59e-08d85fcd0b2e x-ms-traffictypediagnostic: HK0PR03MB4067: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6430; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: HK2PR0302MB2594.apcprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 56c16a34-9586-4f38-f59e-08d85fcd0b2e X-MS-Exchange-CrossTenant-originalarrivaltime: 23 Sep 2020 14:29:13.2896 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5c7d0b28-bdf8-410c-aa93-4df372b16203 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: fTERKvaNx0st40RA1LoXcjM2dXkgpx/f3GZbTdhsOD9+xto/WR22/xrj8F9oQpihg5kBme5uTPkDAZbDPPv0zg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: HK0PR03MB4067 X-OriginatorOrg: lenovo.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Baoquan, > -----Original Message----- > From: Baoquan He > Sent: Wednesday, September 23, 2020 10:33 AM > To: joro@8bytes.org; Adrian Huang12 > Cc: iommu@lists.linux-foundation.org; linux-kernel@vger.kernel.org; > jsnitsel@redhat.com > Subject: [External] Re: [PATCH] Revert "iommu/amd: Treat per-device exclu= sion > ranges as r/w unity-mapped regions" >=20 > Forgot CC-ing Jerry, add him. >=20 > On 09/23/20 at 10:26am, Baoquan He wrote: > > A regression failure of kdump kernel boot was reported on a HPE system. > > Bisect points at commit 387caf0b759ac43 ("iommu/amd: Treat per-device > > exclusion ranges as r/w unity-mapped regions") as criminal. Reverting > > it fix the failure. > > > > With the commit, kdump kernel will always print below error message, > > then naturally AMD iommu can't function normally during kdump kernel > bootup. > > > > ~~~~~~~~~ > > AMD-Vi: [Firmware Bug]: IVRS invalid checksum > > > > Why commit 387caf0b759ac43 causing it haven't been made clear. >=20 > Hi Joerg, Adrian >=20 > We only have one machine which can reproduce the issue, it's a gen10-01 o= f > HPE. If any log or info are needed, please let me know, I can attach here= . Could you please provide the following info? 1. The booting log for both system kernel and kdump kernel by appending the= kernel parameter 'amd_iommu_dump' 2. ACPI table (# acpidump > acpi-table) -> Send out the file 'acpi-table'.= =20 -- Adrian =20