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scancount=1 engine=8.12.0-2212070000 definitions=main-2301100098 X-Proofpoint-GUID: c6neLZktkjnEBRirBEmgquKFjA3poGUL X-Proofpoint-ORIG-GUID: c6neLZktkjnEBRirBEmgquKFjA3poGUL Received-SPF: pass client-ip=205.220.177.32; envelope-from=joao.m.martins@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, 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_H2=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 10/01/2023 15:43, Joao Martins wrote: > On 10/01/2023 12:37, David Woodhouse wrote: >> So for now we'll limit the >> back ends to mapping a single grant ref at a time. >> > Which is not a practical limitation right now. Gah, no. xen-usb and 9p do use possibly-discontiguous grant maps :( > One grant ref is actually fine > for the everything else that is not the block shared-ring. Xen devices in Qemu > seem to be using the legacy backend interface, and thus (un)mapping one grant at > a time, or otherwise copying grefs. >