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a="65924088" X-IronPort-AV: E=Sophos;i="6.20,217,1758610800"; d="scan'208";a="65924088" X-CSE-ConnectionGUID: uCCP/QygS7OqN4c4ELGArg== X-CSE-MsgGUID: 1KYwNuBNT8OPsvPWQ383vg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,217,1758610800"; d="scan'208";a="191064624" From: Vivek Kasireddy To: qemu-devel@nongnu.org Cc: Vivek Kasireddy , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Akihiko Odaki , Dmitry Osipenko , Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH v3 8/9] virtio-gpu-dmabuf: Introduce ram_block_is_memfd_backed() helper Date: Fri, 21 Nov 2025 22:46:29 -0800 Message-ID: <20251122064936.2948632-9-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251122064936.2948632-1-vivek.kasireddy@intel.com> References: <20251122064936.2948632-1-vivek.kasireddy@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.198.163.14; envelope-from=vivek.kasireddy@intel.com; helo=mgamail.intel.com X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, T_SPF_HELO_TEMPERROR=0.01, T_SPF_TEMPERROR=0.01 autolearn=no 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1763798008651018900 This helper function provides a way to determine if a ram block is backed by memfd by checking the SEALS on the associated fd. This is useful in scenarios where we need to quickly verify if a given memory region is associated with a memfd or not. Cc: Marc-Andr=C3=A9 Lureau Cc: Alex Benn=C3=A9e Cc: Akihiko Odaki Cc: Dmitry Osipenko Cc: Alex Williamson Cc: C=C3=A9dric Le Goater Signed-off-by: Vivek Kasireddy --- hw/display/virtio-gpu-dmabuf.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/hw/display/virtio-gpu-dmabuf.c b/hw/display/virtio-gpu-dmabuf.c index c34d4c85bc..258c48d31b 100644 --- a/hw/display/virtio-gpu-dmabuf.c +++ b/hw/display/virtio-gpu-dmabuf.c @@ -27,6 +27,19 @@ #include "standard-headers/linux/udmabuf.h" #include "standard-headers/drm/drm_fourcc.h" =20 +static bool ram_block_is_memfd_backed(RAMBlock *rb) +{ + int ret; + + if (rb && rb->fd > 0) { + ret =3D fcntl(rb->fd, F_GET_SEALS); + if (ret > 0) { + return true; + } + } + return false; +} + static void virtio_gpu_create_udmabuf(struct virtio_gpu_simple_resource *r= es) { struct udmabuf_create_list *list; @@ -94,20 +107,14 @@ static void virtio_gpu_destroy_dmabuf(struct virtio_gp= u_simple_resource *res) static int find_memory_backend_type(Object *obj, void *opaque) { bool *memfd_backend =3D opaque; - int ret; =20 if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) { HostMemoryBackend *backend =3D MEMORY_BACKEND(obj); - RAMBlock *rb =3D backend->mr.ram_block; =20 - if (rb && rb->fd > 0) { - ret =3D fcntl(rb->fd, F_GET_SEALS); - if (ret > 0) { - *memfd_backend =3D true; - } + if (ram_block_is_memfd_backed(backend->mr.ram_block)) { + *memfd_backend =3D true; } } - return 0; } =20 --=20 2.50.1