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X-MS-Exchange-CrossTenant-userprincipalname: c3YFldo8VF7/eJfPR6CnnXE38ewokTYa0LKUxvKFtknSbyDJOHyAk9Nh/lko9aLX0VRqPUpUvUZj338zw5kopA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR11MB2045 X-OriginatorOrg: intel.com Cc: "Raj, Ashok" , "linux-kernel@vger.kernel.org" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" > From: Lu Baolu > Sent: Friday, July 10, 2020 1:37 PM > > Hi Kevin, > > On 2020/7/10 10:42, Tian, Kevin wrote: > >> From: Lu Baolu > >> Sent: Thursday, July 9, 2020 3:06 PM > >> > >> After page requests are handled, software must respond to the device > >> which raised the page request with the result. This is done through > >> the iommu ops.page_response if the request was reported to outside of > >> vendor iommu driver through iommu_report_device_fault(). This adds > the > >> VT-d implementation of page_response ops. > >> > >> Co-developed-by: Jacob Pan > >> Signed-off-by: Jacob Pan > >> Co-developed-by: Liu Yi L > >> Signed-off-by: Liu Yi L > >> Signed-off-by: Lu Baolu > >> --- > >> drivers/iommu/intel/iommu.c | 1 + > >> drivers/iommu/intel/svm.c | 100 > >> ++++++++++++++++++++++++++++++++++++ > >> include/linux/intel-iommu.h | 3 ++ > >> 3 files changed, 104 insertions(+) > >> > >> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c > >> index 4a6b6960fc32..98390a6d8113 100644 > >> --- a/drivers/iommu/intel/iommu.c > >> +++ b/drivers/iommu/intel/iommu.c > >> @@ -6057,6 +6057,7 @@ const struct iommu_ops intel_iommu_ops = { > >> .sva_bind = intel_svm_bind, > >> .sva_unbind = intel_svm_unbind, > >> .sva_get_pasid = intel_svm_get_pasid, > >> + .page_response = intel_svm_page_response, > >> #endif > >> }; > >> > >> diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c > >> index d24e71bac8db..839d2af377b6 100644 > >> --- a/drivers/iommu/intel/svm.c > >> +++ b/drivers/iommu/intel/svm.c > >> @@ -1082,3 +1082,103 @@ int intel_svm_get_pasid(struct iommu_sva > *sva) > >> > >> return pasid; > >> } > >> + > >> +int intel_svm_page_response(struct device *dev, > >> + struct iommu_fault_event *evt, > >> + struct iommu_page_response *msg) > >> +{ > >> + struct iommu_fault_page_request *prm; > >> + struct intel_svm_dev *sdev = NULL; > >> + struct intel_svm *svm = NULL; > >> + struct intel_iommu *iommu; > >> + bool private_present; > >> + bool pasid_present; > >> + bool last_page; > >> + u8 bus, devfn; > >> + int ret = 0; > >> + u16 sid; > >> + > >> + if (!dev || !dev_is_pci(dev)) > >> + return -ENODEV; > >> + > >> + iommu = device_to_iommu(dev, &bus, &devfn); > >> + if (!iommu) > >> + return -ENODEV; > >> + > >> + if (!msg || !evt) > >> + return -EINVAL; > >> + > >> + mutex_lock(&pasid_mutex); > >> + > >> + prm = &evt->fault.prm; > >> + sid = PCI_DEVID(bus, devfn); > >> + pasid_present = prm->flags & > >> IOMMU_FAULT_PAGE_REQUEST_PASID_VALID; > >> + private_present = prm->flags & > >> IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA; > >> + last_page = prm->flags & > >> IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE; > >> + > >> + if (pasid_present) { > >> + if (prm->pasid == 0 || prm->pasid >= PASID_MAX) { > >> + ret = -EINVAL; > >> + goto out; > >> + } > >> + > >> + ret = pasid_to_svm_sdev(dev, prm->pasid, &svm, &sdev); > >> + if (ret || !sdev) { > >> + ret = -ENODEV; > >> + goto out; > >> + } > >> + > >> + /* > >> + * For responses from userspace, need to make sure that the > >> + * pasid has been bound to its mm. > >> + */ > >> + if (svm->flags & SVM_FLAG_GUEST_MODE) { > >> + struct mm_struct *mm; > >> + > >> + mm = get_task_mm(current); > >> + if (!mm) { > >> + ret = -EINVAL; > >> + goto out; > >> + } > >> + > >> + if (mm != svm->mm) { > >> + ret = -ENODEV; > >> + mmput(mm); > >> + goto out; > >> + } > >> + > >> + mmput(mm); > >> + } > >> + } else { > >> + pr_err_ratelimited("Invalid page response: no pasid\n"); > >> + ret = -EINVAL; > >> + goto out; > > > > check pasid=0 first, then no need to indent so many lines above. > > Yes. > > > > >> + } > >> + > >> + /* > >> + * Per VT-d spec. v3.0 ch7.7, system software must respond > >> + * with page group response if private data is present (PDP) > >> + * or last page in group (LPIG) bit is set. This is an > >> + * additional VT-d requirement beyond PCI ATS spec. > >> + */ > > > > What is the behavior if system software doesn't follow the requirement? > > en... maybe the question is really about whether the information in prm > > comes from userspace or from internally-recorded info in iommu core. > > The former cannot be trusted. The latter one is OK. > > We require a page response when reporting such event. The upper layer > (IOMMU core or VFIO) will be implemented with a timer, if userspace > doesn't respond in time, the timer will get expired and a FAILURE > response will be sent to device. Yes, timer helps when userspace doesn't respond. Then I'm fine with this patch. Reviewed-by: Kevin Tian btw when you say IOMMU core or VFIO, does it mean the timer mechanism is not implemented yet? Thanks Kevin > > Best regards, > baolu > > > > > Thanks > > Kevin > > > >> + if (last_page || private_present) { > >> + struct qi_desc desc; > >> + > >> + desc.qw0 = QI_PGRP_PASID(prm->pasid) | QI_PGRP_DID(sid) > >> | > >> + QI_PGRP_PASID_P(pasid_present) | > >> + QI_PGRP_PDP(private_present) | > >> + QI_PGRP_RESP_CODE(msg->code) | > >> + QI_PGRP_RESP_TYPE; > >> + desc.qw1 = QI_PGRP_IDX(prm->grpid) | > >> QI_PGRP_LPIG(last_page); > >> + desc.qw2 = 0; > >> + desc.qw3 = 0; > >> + if (private_present) > >> + memcpy(&desc.qw2, prm->private_data, > >> + sizeof(prm->private_data)); > >> + > >> + qi_submit_sync(iommu, &desc, 1, 0); > >> + } > >> +out: > >> + mutex_unlock(&pasid_mutex); > >> + return ret; > >> +} > >> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h > >> index fc2cfc3db6e1..bf6009a344f5 100644 > >> --- a/include/linux/intel-iommu.h > >> +++ b/include/linux/intel-iommu.h > >> @@ -741,6 +741,9 @@ struct iommu_sva *intel_svm_bind(struct device > >> *dev, struct mm_struct *mm, > >> void *drvdata); > >> void intel_svm_unbind(struct iommu_sva *handle); > >> int intel_svm_get_pasid(struct iommu_sva *handle); > >> +int intel_svm_page_response(struct device *dev, struct > iommu_fault_event > >> *evt, > >> + struct iommu_page_response *msg); > >> + > >> struct svm_dev_ops; > >> > >> struct intel_svm_dev { > >> -- > >> 2.17.1 > > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu