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Wed, 27 Mar 2024 21:04:13 +0000 From: Volodymyr Babchuk To: Konrad Dybcio CC: Caleb Connolly , Bjorn Andersson , "linux-arm-msm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Douglas Anderson , Rob Clark Subject: Re: [PATCH] soc: qcom: cmd-db: map shared memory as WT, not WB Thread-Topic: [PATCH] soc: qcom: cmd-db: map shared memory as WT, not WB Thread-Index: AQHagIKviCrPH112HEOpsjr5BCtYWLFMDkOAgAAEYgA= Date: Wed, 27 Mar 2024 21:04:13 +0000 Message-ID: <87a5mjz8s3.fsf@epam.com> References: <20240327200917.2576034-1-volodymyr_babchuk@epam.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: mu4e 1.10.7; emacs 29.1 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: GV1PR03MB10456:EE_|DB9PR03MB7227:EE_ x-ms-office365-filtering-correlation-id: 5b06d9b5-db31-4bc4-b5af-08dc4ea174a6 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:GV1PR03MB10456.eurprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(366007)(1800799015)(376005)(38070700009);DIR:OUT;SFP:1102; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: epam.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: GV1PR03MB10456.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5b06d9b5-db31-4bc4-b5af-08dc4ea174a6 X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Mar 2024 21:04:13.3141 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b41b72d0-4e9f-4c26-8a69-f949f367c91d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: Ieyzz0Py4ChcHca82pe8Bmbw2/TOEpBF6lDNmyt+11XgUXpBK4PAH2k2JnPrMvJvxBUJFT4X/iN8x0xFabkYJY++TClVCTPE6ilVLl2AMlA= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR03MB7227 X-Proofpoint-GUID: D87HMTI_2x9DmDAUEDPMEOc7Oqksf5aC X-Proofpoint-ORIG-GUID: D87HMTI_2x9DmDAUEDPMEOc7Oqksf5aC X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-27_18,2024-03-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 adultscore=0 clxscore=1011 spamscore=0 impostorscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 phishscore=0 priorityscore=1501 suspectscore=0 mlxlogscore=847 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2403210001 definitions=main-2403270149 Hi Konrad, Konrad Dybcio writes: > On 27.03.2024 9:09 PM, Volodymyr Babchuk wrote: >> It appears that hardware does not like cacheable accesses to this >> region. Trying to access this shared memory region as Normal Memory >> leads to secure interrupt which causes an endless loop somewhere in >> Trust Zone. >>=20 >> The only reason it is working right now is because Qualcomm Hypervisor >> maps the same region as Non-Cacheable memory in Stage 2 translation >> tables. The issue manifests if we want to use another hypervisor (like >> Xen or KVM), which does not know anything about those specific >> mappings. This patch fixes the issue by mapping the shared memory as >> Write-Through. This removes dependency on correct mappings in Stage 2 >> tables. >>=20 >> I tested this on SA8155P with Xen. >>=20 >> Signed-off-by: Volodymyr Babchuk >> --- > > Interesting.. > > +Doug, Rob have you ever seen this on Chrome? (FYI, Volodymyr, chromebook= s > ship with no qcom hypervisor) Well, maybe I was wrong when called this thing "hypervisor". All I know that it sits in hyp.mbn partition and all what it does is setup EL2 before switching to EL1 and running UEFI. In my experiments I replaced contents of hyp.mbn with U-Boot, which gave me access to EL2 and I was able to boot Xen and then Linux as Dom0. --=20 WBR, Volodymyr=