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Tsirkin" , Paolo Bonzini , =?UTF-8?q?Alex=20Benn=C3=A9e?= , David Hildenbrand , Pierrick Bouvier , qemu-arm@nongnu.org, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Peter Xu , Peter Maydell , Mahmoud Mandour , Manos Pitsidianakis , qemu-stable@nongnu.org Subject: [PATCH 9/9] virtio-gpu: refactor async blob unmapping Date: Mon, 28 Apr 2025 13:59:18 +0100 Message-Id: <20250428125918.449346-10-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250428125918.449346-1-alex.bennee@linaro.org> References: <20250428125918.449346-1-alex.bennee@linaro.org> 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=2a00:1450:4864:20::535; envelope-from=alex.bennee@linaro.org; helo=mail-ed1-x535.google.com X-Spam_score_int: 12 X-Spam_score: 1.2 X-Spam_bar: + X-Spam_report: (1.2 / 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_NONE=-0.0001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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 @linaro.org) X-ZM-MESSAGEID: 1745845555609019000 From: Manos Pitsidianakis Change the 3 part async cleanup of a blob memory mapping to check if the unmapping has finished already after deleting the subregion; this condition allows us to skip suspending the command and responding to the guest right away. Signed-off-by: Manos Pitsidianakis Reviewed-by: Philippe Mathieu-Daud=C3=A9 Message-Id: <20250410122643.1747913-4-manos.pitsidianakis@linaro.org> Cc: qemu-stable@nongnu.org --- hw/display/virtio-gpu-virgl.c | 35 +++++++++++++++++++++++++---------- 1 file changed, 25 insertions(+), 10 deletions(-) diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c index 8fbe4e70cc..32a32879f7 100644 --- a/hw/display/virtio-gpu-virgl.c +++ b/hw/display/virtio-gpu-virgl.c @@ -155,7 +155,32 @@ virtio_gpu_virgl_unmap_resource_blob(VirtIOGPU *g, * asynchronously by virtio_gpu_virgl_hostmem_region_free(). * 3. Finish the unmapping with final virgl_renderer_resource_unmap(). */ + + /* 1. Check if we should start unmapping now */ + if (!vmr->finish_unmapping) { + /* begin async unmapping. render will be unblocked once MR is free= d */ + b->renderer_blocked++; + + memory_region_set_enabled(mr, false); + memory_region_del_subregion(&b->hostmem, mr); + object_unparent(OBJECT(mr)); + /* + * The unmapping might have already finished at this point if no o= ne + * else held a reference to the MR; if yes, we can skip suspending= the + * command and unmap the resource right away. + */ + *cmd_suspended =3D !vmr->finish_unmapping; + } + + /* + * 2. if virtio_gpu_virgl_hostmem_region_free hasn't been executed yet= , we + * have marked the command to be re-processed later by setting + * cmd_suspended to true. The freeing callback will be called from RCU + * context later. + */ + if (vmr->finish_unmapping) { + /* 3. MemoryRegion has been freed, so finish unmapping */ res->mr =3D NULL; g_free(vmr); =20 @@ -166,16 +191,6 @@ virtio_gpu_virgl_unmap_resource_blob(VirtIOGPU *g, __func__, strerror(-ret)); return ret; } - } else { - *cmd_suspended =3D true; - - /* render will be unblocked once MR is freed */ - b->renderer_blocked++; - - /* memory region owns self res->mr object and frees it by itself */ - memory_region_set_enabled(mr, false); - memory_region_del_subregion(&b->hostmem, mr); - object_unparent(OBJECT(mr)); } =20 return 0; --=20 2.39.5