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Tsirkin" , Jason Wang , Si-Wei Liu , Eugenio Perez Martin , Xuan Zhuo , Dragos Tatulea , Eli Cohen , Xie Yongji , Steve Sistare Subject: [RFC V1 12/13] vdpa_sim: new owner capability Date: Wed, 10 Jan 2024 12:40:14 -0800 Message-Id: <1704919215-91319-13-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1704919215-91319-1-git-send-email-steven.sistare@oracle.com> References: <1704919215-91319-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-01-10_10,2024-01-10_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 bulkscore=0 adultscore=0 phishscore=0 malwarescore=0 mlxlogscore=999 suspectscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2401100163 X-Proofpoint-GUID: 2Hu1AOJmzavdJfK1M9mH4m5SRgKm8PAD X-Proofpoint-ORIG-GUID: 2Hu1AOJmzavdJfK1M9mH4m5SRgKm8PAD Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1787737718098461394 X-GMAIL-MSGID: 1787737718098461394 The vdpa_sim device supports ownership transfer to a new process, so advertise VHOST_BACKEND_F_NEW_OWNER. User virtual addresses are used by the software iommu, so VHOST_IOTLB_REMAP is required after VHOST_NEW_OWNER, so advertise VHOST_BACKEND_F_IOTLB_REMAP. Signed-off-by: Steve Sistare --- drivers/vdpa/vdpa_sim/vdpa_sim.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c index 8734834983cb..d037869d8a89 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c @@ -430,7 +430,13 @@ static u64 vdpasim_get_device_features(struct vdpa_device *vdpa) static u64 vdpasim_get_backend_features(const struct vdpa_device *vdpa) { - return BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK); + u64 features = BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK) | + BIT_ULL(VHOST_BACKEND_F_NEW_OWNER); + + if (use_va) + features += BIT_ULL(VHOST_BACKEND_F_IOTLB_REMAP); + + return features; } static int vdpasim_set_driver_features(struct vdpa_device *vdpa, u64 features)