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Thu, 28 Jan 2021 14:38:08 +0000 From: John Levon To: Stefan Hajnoczi Subject: Re: [DRAFT RFC] ioeventfd/ioregionfd support in vfio-user Thread-Topic: [DRAFT RFC] ioeventfd/ioregionfd support in vfio-user Thread-Index: AQHW8A/A4RU7AycUJk25Cn4pd6oBpqo5xPQAgANhTIA= Date: Thu, 28 Jan 2021 14:38:08 +0000 Message-ID: <20210128143805.GA95453@sent> References: <20210121160905.GA314820@sent> <20210126110104.GA250425@stefanha-x1.localdomain> In-Reply-To: <20210126110104.GA250425@stefanha-x1.localdomain> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: redhat.com; dkim=none (message not signed) header.d=none;redhat.com; dmarc=none action=none header.from=nutanix.com; x-originating-ip: [88.98.93.30] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 96d42a07-903d-465d-de28-08d8c39a547e x-ms-traffictypediagnostic: MN2PR02MB6174: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-proofpoint-crosstenant: true x-ms-oob-tlc-oobclassifiers: OLM:6790; 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envelope-from=john.levon@nutanix.com; helo=mx0b-002c1b01.pphosted.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.252, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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: "john.g.johnson@oracle.com" , "kvm@vger.kernel.org" , John Levon , Cornelia Huck , "libvfio-user-devel@nongnu.org" , "qemu-devel@nongnu.org" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Jan 26, 2021 at 11:01:04AM +0000, Stefan Hajnoczi wrote: > > 4) (ioregionfd issue) region_id is 4 bytes, which seems a little awkwar= d from > > the server side: this has to encode both the region ID as well as the o= ffset of > > the sub-region within that region. Can this be 64 bits wide? >=20 > The user_data field in Elena's ioregionfd patches is 64 bits. Does this > solve the problem? I had missed this had been changed from the proposal at https://www.spinics= .net/lists/kvm/msg208139.html Thanks for pointing this out. regards john=