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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: DM6PR11MB3771.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: d32bdaf4-b0fe-4e99-4e8a-08d98e16b022 X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Oct 2021 06:57:14.2870 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: NMAQCUngUbdDyJyP4ylquuexdSIi8VWTNpcGDjcOtBKdrfzQZlku//HtN++zQcS8JWAzRGVBfcbdAm2Kt94bnA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR11MB4011 X-OriginatorOrg: intel.com Subject: Re: [dpdk-dev] [PATCH v7 1/2] vfio: allow partially unmapping adjacent memory X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> > -----Original Message----- > From: Ding, Xuan <xuan.ding@intel.com> > Sent: Monday, October 11, 2021 4:00 PM > To: dev@dpdk.org; Burakov, Anatoly <anatoly.burakov@intel.com>; > maxime.coquelin@redhat.com; Xia, Chenbo <chenbo.xia@intel.com> > Cc: Hu, Jiayu <jiayu.hu@intel.com>; Jiang, Cheng1 <cheng1.jiang@intel.com= >; > Richardson, Bruce <bruce.richardson@intel.com>; Pai G, Sunil > <sunil.pai.g@intel.com>; Wang, Yinan <yinan.wang@intel.com>; Yang, > YvonneX <yvonnex.yang@intel.com>; Ding, Xuan <xuan.ding@intel.com> > Subject: [PATCH v7 1/2] vfio: allow partially unmapping adjacent memory >=20 > Currently, if we map a memory area A, then map a separate memory area B > that by coincidence happens to be adjacent to A, current implementation w= ill > merge these two segments into one, and if partial unmapping is not > supported, these segments will then be only allowed to be unmapped in one > go. In other words, given segments A and B that are adjacent, it is curre= ntly > not possible to map A, then map B, then unmap A. >=20 > Fix this by adding a notion of "chunk size", which will allow subdividing > segments into equally sized segments whenever we are dealing with an > IOMMU that does not support partial unmapping. With this change, we will > still be able to merge adjacent segments, but only if they are of the sam= e size. > If we keep with our above example, adjacent segments A and B will be > stored as separate segments if they are of different sizes. >=20 > Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com> > Signed-off-by: Xuan Ding <xuan.ding@intel.com> > --- Tested-by: Yvonne Yang <yvonnex.yang@intel.com>