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Tsirkin" Subject: Re: [PATCH v4 1/1] virtio: fix the condition for iommu_platform not supported Message-ID: <20220205010205.17e1de76.pasic@linux.ibm.com> In-Reply-To: <20220204080404-mutt-send-email-mst@kernel.org> References: <20220202195438.379753-1-pasic@linux.ibm.com> <20220203170635.1dd2b98d.pasic@linux.ibm.com> <20220204080404-mutt-send-email-mst@kernel.org> Organization: IBM X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: MZAQWK2NxPZK-LtL0zobGa3yTpZdbQzD X-Proofpoint-ORIG-GUID: AKWmMBOnJWye99x4omVix5XRP2ILo7xt X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-04_07,2022-02-03_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 bulkscore=0 phishscore=0 clxscore=1015 malwarescore=0 mlxscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 spamscore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202040131 Received-SPF: pass client-ip=148.163.158.5; envelope-from=pasic@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Cornelia Huck , Brijesh Singh , Jason Wang , Daniel Henrique Barboza , qemu-devel@nongnu.org, qemu-stable@nongnu.org, Halil Pasic , Jakob Naucke Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, 4 Feb 2022 08:05:25 -0500 "Michael S. Tsirkin" wrote: > On Thu, Feb 03, 2022 at 05:06:35PM +0100, Halil Pasic wrote: > > On Wed, 2 Feb 2022 20:54:38 +0100 > > Halil Pasic wrote: > > > > > } > > > @@ -82,9 +78,14 @@ void virtio_bus_device_plugged(VirtIODevice *vdev, Error **errp) > > > return; > > > } > > > > > > + vdev_has_iommu = virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); > > > if (klass->get_dma_as != NULL && has_iommu) { > > > virtio_add_feature(&vdev->host_features, VIRTIO_F_IOMMU_PLATFORM); > > > vdev->dma_as = klass->get_dma_as(qbus->parent); > > > + if (!vdev_has_iommu && vdev->dma_as != &address_space_memory) { > > > + error_setg(errp, > > > + "iommu_platform=true is not supported by the device"); > > > + } > > > > I'm wondering, would it be wise to change the message? Since this is now > > dependent on the VM/bus the device is plugged into the message might be a > > little misleading: i.e. the very same device could work perfectly fine > > with iommu_platform=true if the "surroundings" are different. > > > > Maybe "the device has no IOMMU support (iommu_platform=true)" would be a > > better option. On the other hand changing the message has its downsides > > as well. > > I personally don't care much frankly. > > > Also I realized that keeping the return after error_setg() might have > > been a good idea for the case more logic is added at the end of the > > function. > > OK so you are sending v5 with this change then? As stated below, I would prefer to get this merged. If I change the message, I guess I have to drop the r-b's and the I'm sure the if somebody decides to add logic to the end of the function that person will be careful enough. > > > In any case I would like to address these, if necessary with a separate > > patch. I don't want the fix to experience any further delays. > > > > Regards, > > Halil >