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a="63965793" X-IronPort-AV: E=Sophos;i="6.19,291,1754982000"; d="scan'208";a="63965793" X-CSE-ConnectionGUID: EguJ80UJQwqD0AnkSUjteA== X-CSE-MsgGUID: KfR4f3qaRiOynHV93I+xcg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,291,1754982000"; d="scan'208";a="188129069" 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 v2 09/10] virtio-gpu-dmabuf: Introduce qemu_iovec_same_memory_regions() Date: Sat, 8 Nov 2025 21:33:52 -0800 Message-ID: <20251109053801.2267149-10-vivek.kasireddy@intel.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251109053801.2267149-1-vivek.kasireddy@intel.com> References: <20251109053801.2267149-1-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=192.198.163.18; envelope-from=vivek.kasireddy@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1762666792431158500 Add a helper to check whether the addresses in an iovec array belong to the same memory region or not. This is useful to verify before trying to create a dmabuf from an iovec array. 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 | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/hw/display/virtio-gpu-dmabuf.c b/hw/display/virtio-gpu-dmabuf.c index c34d4c85bc..80143034d4 100644 --- a/hw/display/virtio-gpu-dmabuf.c +++ b/hw/display/virtio-gpu-dmabuf.c @@ -27,6 +27,31 @@ #include "standard-headers/linux/udmabuf.h" #include "standard-headers/drm/drm_fourcc.h" =20 +static bool qemu_iovec_same_memory_regions(const struct iovec *iov, int io= v_cnt) +{ + RAMBlock *rb, *curr_rb; + ram_addr_t offset; + int i; + + rb =3D qemu_ram_block_from_host(iov[0].iov_base, false, &offset); + if (!rb) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Could not find ramblock/memory region\n", __fun= c__); + return false; + } + + for (i =3D 1; i < iov_cnt; i++) { + curr_rb =3D qemu_ram_block_from_host(iov[i].iov_base, false, &offset); + if (curr_rb !=3D rb) { + qemu_log_mask(LOG_GUEST_ERROR, + "%s: memory regions not same for iov entries\n", + __func__); + return false; + } + } + return true; +} + static void virtio_gpu_create_udmabuf(struct virtio_gpu_simple_resource *r= es) { struct udmabuf_create_list *list; @@ -137,6 +162,10 @@ void virtio_gpu_init_dmabuf(struct virtio_gpu_simple_r= esource *res) res->iov[0].iov_len < 4096) { pdata =3D res->iov[0].iov_base; } else { + if (!qemu_iovec_same_memory_regions(res->iov, res->iov_cnt)) { + return; + } + virtio_gpu_create_udmabuf(res); if (res->dmabuf_fd < 0) { return; --=20 2.50.1