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Fri, 7 May 2021 13:51:52 +0000 From: Thanos Makatos To: "qemu-devel@nongnu.org" Subject: question regarding QEMU adding overlapping memory regions to VFIO Thread-Topic: question regarding QEMU adding overlapping memory regions to VFIO Thread-Index: AddDR/aFSv9jmdx9TKe5+OpCTvxxcA== Date: Fri, 7 May 2021 13:51:52 +0000 Message-ID: Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: nongnu.org; dkim=none (message not signed) header.d=none;nongnu.org; dmarc=none action=none header.from=nutanix.com; x-originating-ip: [78.149.4.199] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a254016e-fd84-4451-4cbf-08d9115f44dc x-ms-traffictypediagnostic: CO6PR02MB7844: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-proofpoint-crosstenant: true x-ms-oob-tlc-oobclassifiers: OLM:5797; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nutanix.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MW2PR02MB3723.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a254016e-fd84-4451-4cbf-08d9115f44dc X-MS-Exchange-CrossTenant-originalarrivaltime: 07 May 2021 13:51:52.2600 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bb047546-786f-4de1-bd75-24e5b6f79043 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: hNFABnMrmW6ojTeYS4mNMaonbCCc63oa8s9nrAMbX4jyctUwT0Zd8vxXAzjlTBIRs1HvZZLkyhUa4B5fHfAXJBy/wBzWa5hO1J+HGRsRpzg= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR02MB7844 X-Proofpoint-GUID: FdNOlc6wIFPuJZpB-NgKkpmcem3rjHUv X-Proofpoint-ORIG-GUID: FdNOlc6wIFPuJZpB-NgKkpmcem3rjHUv X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.761 definitions=2021-05-07_04:2021-05-06, 2021-05-07 signatures=0 X-Proofpoint-Spam-Reason: safe Received-SPF: pass client-ip=148.163.155.12; envelope-from=thanos.makatos@nutanix.com; helo=mx0b-002c1b01.pphosted.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.699, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "alex.williamson@redhat.com" , Raphael Norwitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" I've noticed that QEMU adds overlapping memory regions to VFIO, e.g.: vfio_listener_region_add_ram region_add [ram] 0xc0000 - 0xc0fff [0x7f6702c0= 0000] vfio_listener_region_del region_del 0xc4000 - 0xdffff vfio_listener_region_add_ram region_add [ram] 0xc1000 - 0xc3fff [0x7f66406c= 1000] vfio_listener_region_del region_del 0xe0000 - 0xfffff vfio_listener_region_add_ram region_add [ram] 0xc4000 - 0xdffff [0x7f6702c0= 4000] vfio_listener_region_add_ram region_add [ram] 0xc0000 - 0xc0fff [0x7f66406c= 0000] 2021-05-05T09:38:16.158864Z qemu-system-x86_64: vfio_dma_map(0x557b8fd281b0= , 0xc0000, 0x1000, 0x7f66406c0000) =3D -22 (Resource temporarily unavailabl= e) Region 0xc0000 - 0xc0fff is added first and then region 0xc0000 - 0xc0fff i= s added again? Is this legitimate? What is the implication of this? Is the = previous region replaced by the more recent one?