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Tue, 24 Mar 2026 15:05:24 -0700 (PDT) Received: from localhost ([2601:1c0:5000:d5c:4ec8:83f5:8254:6891]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b083516400sm154973585ad.11.2026.03.24.15.05.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 15:05:24 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , Dmitry Baryshkov , Abhinav Kumar , Jessica Zhang , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , linux-kernel@vger.kernel.org (open list) Subject: [PATCH 1/2] drm/msm: Disallow foreign mapping of _NO_SHARE Date: Tue, 24 Mar 2026 15:05:17 -0700 Message-ID: <20260324220519.1221471-1-robin.clark@oss.qualcomm.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI0MDE3MCBTYWx0ZWRfX2ieY0jP+FaNR R0CRdagiUgSTTQgKGhcOOqlBz11ehsjzULaItu2LBAj1p20LzaANaUAFhbMxv3QwOPGzzVKpepi dsrvFeUXDA4YN7QONFJ+cb/MxVOxqfE4HZ5/vc1OB2Mmmx0fWPzY7Ip9VIHFzELOIM3w/buFbi4 RsraEIlgB4D1IwO37VgCqWrWrjybtmUF44WvaJSVKw7VpUAoZxgMO2bd5IHL5uiGZZGixQfDp7n w7DshV21NvQoZnpNCIZkRI6nTJ+BKSMqg35wuE4DJUyPOH5cJJAeGbjda68vHJ+jVYXprI34jEa P8NfWLp3+uTWOTJe4o/oZgWBRuW2wewYZ5VubBgGSJaJ6KkKb7mgRCtlYDLA8o5Y8sgSEqJ/bwE N34IRTC9cvRlrqXo4cRTpKfc9i6jWla3xHViRjpUf1Lz6d5qD8gwFKL1JhGWiuvJ//YkyoweCr+ SDkADUqebK2lDiQTcwA== X-Proofpoint-GUID: fuc9pVtdGVHnFM0sUkb2WoGgsUg0_7BT X-Proofpoint-ORIG-GUID: fuc9pVtdGVHnFM0sUkb2WoGgsUg0_7BT X-Authority-Analysis: v=2.4 cv=Bd/VE7t2 c=1 sm=1 tr=0 ts=69c30aa6 cx=c_pps a=JL+w9abYAAE89/QcEU+0QA==:117 a=xqWC_Br6kY4A:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=yOCtJkima9RkubShWh1s:22 a=EUspDBNiAAAA:8 a=rycHe8qCt1V8VBfbKgMA:9 a=324X-CrmTo6CU4MGRt3R:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-24_03,2026-03-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 clxscore=1015 malwarescore=0 bulkscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603240170 This restriction applies to mapping of _NO_SHARE objs in the kms vm as well as importing/exporting BOs. Since the DPU has it's own VM, scanout counts as "exporting" a BO from outside of it's host VM. Signed-off-by: Rob Clark --- v2: Fix issue with MAP_NULL drivers/gpu/drm/msm/msm_gem_vma.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c index 1c6b0920c0d8..43d61e0919bd 100644 --- a/drivers/gpu/drm/msm/msm_gem_vma.c +++ b/drivers/gpu/drm/msm/msm_gem_vma.c @@ -373,6 +373,12 @@ msm_gem_vma_new(struct drm_gpuvm *gpuvm, struct drm_gem_object *obj, struct msm_gem_vma *vma; int ret; + /* _NO_SHARE objs cannot be mapped outside of their "host" vm: */ + if (obj && (to_msm_bo(obj)->flags & MSM_BO_NO_SHARE) && + GEM_WARN_ON(obj->resv != drm_gpuvm_resv(gpuvm))) { + return ERR_PTR(-EINVAL); + } + drm_gpuvm_resv_assert_held(&vm->base); vma = kzalloc(sizeof(*vma), GFP_KERNEL); -- 2.53.0