From nobody Tue Apr 7 21:27:34 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1773258236; cv=none; d=zohomail.com; s=zohoarc; b=kwRrUiQvBl/CoaPPvZbHgEiwDiJc38RrL0a3JikyQxOjqt3f/B0tJgcA504MIX1da0aUDizbjKCoMCo7nyCJEMr0sYHAQS3m6Lz7Jx79DKHi+5mtEre1jyxEiXgzaN3MWy3v7bcE8TM2qZhc0PcqkbhmUp5QYcYg+h6sXtXhdCg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1773258236; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=8K1v8trSwp1dH04QNMo4EQM8aWDeFKEKJsj5LA+IMDg=; b=eXIW5eIPlzIBBL+nc49jap/zK7mTQRTPZby7b0vZz/2T3/dGESmFt4IQOoXrilNiPpZQSL0vq/exuyBh8kERHI4duWi36aNlpSZJe55oieyzP73xUIZ07MeWa1rBbanfhRAw22ZuKv+j5jWAQzvHNIgutVcadwFPUPay9+A6JZY= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1773258236958537.1123465930173; Wed, 11 Mar 2026 12:43:56 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1w0POQ-00072Z-SQ; Wed, 11 Mar 2026 15:38:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0PON-0006t2-T0; Wed, 11 Mar 2026 15:38:51 -0400 Received: from isrv.corpit.ru ([212.248.84.144]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1w0POM-0000fI-79; Wed, 11 Mar 2026 15:38:51 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id B2F86192113; Wed, 11 Mar 2026 22:34:29 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id 0133737C478; Wed, 11 Mar 2026 22:35:07 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=tls.msk.ru; s=202602; t=1773257669; bh=aQsgUHqU+mgzDxOJaNa5jTzwJB5/Sre38vAwC70batM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=pJTre/CLlY7VPdpK76ku9U7C3y2FfhtBugYrarmdhRFYxVz+UWR4SBQQoT1UmB937 9oTqYPjoDhvd3l/gUhQcQ+sDeDlG3hK3b/VfEo/1HXnOuRG1hZBO18Ev6dZ5j5EGtn 4nqIN5HYzYjTBFaSsQRmQh6zrFNV8GkKrC8aq+I8eWJVXwNdSWGNc3en2g4zBmj3xb MdxmbDai4vsUUCtm4O5z7ncVGYaeFPfyVy2TJwtR1BBYXzCh6mOMSMYQr0IyvFZ+t8 XNFcTl6ruLwfPhtOW3gSr1unCkn1Z6HdfPAIJ+1KZmXIrhv+z2ifAK6ksxl7XCTpr+ k3YXsVS5KTUmA== From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Dmitry Osipenko , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Michael Tokarev Subject: [Stable-10.2.2 43/53] virtio-gpu: Ensure BHs are invoked only from main-loop thread Date: Wed, 11 Mar 2026 22:34:36 +0300 Message-ID: <20260311193449.1096110-43-mjt@tls.msk.ru> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: 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=212.248.84.144; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -2 X-Spam_score: -0.3 X-Spam_bar: / X-Spam_report: (-0.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.819, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.903, 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: qemu development 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 @tls.msk.ru) X-ZM-MESSAGEID: 1773258238510158500 From: Dmitry Osipenko QEMU's display GL core is tied to main-loop thread and virtio-gpu interacts with display while processing GPU commands. Virtio-gpu BHs work in generic AIO context that can be invoked on vCPU thread, while GL and UI toolkits are bound to the main-loop thread. Make virtio-gpu BHs use iohandler AIO context that is handled in a main-loop thread only. 0 SDL_GL_MakeCurrent() (libSDL3) 1 SDL_GL_MakeCurrent_REAL() (libSDL2) 2 sdl2_gl_make_context_current() (ui/sdl2-gl.c:201) 3 make_current() (virglrenderer.c:639) 4 vrend_finish_context_switch() (vrend_renderer.c:11630) 5 vrend_hw_switch_context() (vrend_renderer.c:11613) 6 vrend_renderer_force_ctx_0() (vrend_renderer.c:12986) 7 virgl_renderer_force_ctx_0() (virglrenderer.c:460) 8 virtio_gpu_virgl_process_cmd() (virtio-gpu-virgl.c:1013) 9 virtio_gpu_process_cmdq() (virtio-gpu.c:1050) 10 virtio_gpu_gl_handle_ctrl() (virtio-gpu-gl.c:86) 11 aio_bh_poll() (util/async.c) 12 aio_poll() (util/aio-posix.c) 13 blk_pwrite() (block/block-gen.c:1985) 14 pflash_update() (pflash_cfi01.c:396) 15 pflash_write() (pflash_cfi01.c:541) 16 memory_region_dispatch_write() (system/memory.c:1554) 17 flatview_write() (system/physmem.c:3333) 18 address_space_write() (system/physmem.c:3453) 19 kvm_cpu_exec() (accel/kvm/kall-all.c:3248) 20 kvm_vcpu_thread_fn() (accel/kvm/kaccel-ops.c:53) Cc: qemu-stable@nongnu.org Signed-off-by: Dmitry Osipenko Message-ID: <20260303151422.977399-8-dmitry.osipenko@collabora.com> Message-ID: <20260304165043.1437519-10-alex.bennee@linaro.org> Signed-off-by: Alex Benn=C3=A9e (cherry picked from commit 235f9b36383e4cc7a790bca51eddbe38edd5438c) Signed-off-by: Michael Tokarev diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c index 4e515c4ef6..1129301d91 100644 --- a/hw/display/virtio-gpu-virgl.c +++ b/hw/display/virtio-gpu-virgl.c @@ -1203,9 +1203,9 @@ int virtio_gpu_virgl_init(VirtIOGPU *g) } =20 #if VIRGL_VERSION_MAJOR >=3D 1 - gl->cmdq_resume_bh =3D aio_bh_new(qemu_get_aio_context(), - virtio_gpu_virgl_resume_cmdq_bh, - g); + gl->cmdq_resume_bh =3D virtio_bh_io_new_guarded(DEVICE(g), + virtio_gpu_virgl_resume_= cmdq_bh, + g); #endif =20 return 0; diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c index 43e88a4daf..ad1ebc0fcd 100644 --- a/hw/display/virtio-gpu.c +++ b/hw/display/virtio-gpu.c @@ -1526,9 +1526,9 @@ void virtio_gpu_device_realize(DeviceState *qdev, Err= or **errp) =20 g->ctrl_vq =3D virtio_get_queue(vdev, 0); g->cursor_vq =3D virtio_get_queue(vdev, 1); - g->ctrl_bh =3D virtio_bh_new_guarded(qdev, virtio_gpu_ctrl_bh, g); - g->cursor_bh =3D virtio_bh_new_guarded(qdev, virtio_gpu_cursor_bh, g); - g->reset_bh =3D qemu_bh_new(virtio_gpu_reset_bh, g); + g->ctrl_bh =3D virtio_bh_io_new_guarded(qdev, virtio_gpu_ctrl_bh, g); + g->cursor_bh =3D virtio_bh_io_new_guarded(qdev, virtio_gpu_cursor_bh, = g); + g->reset_bh =3D virtio_bh_io_new_guarded(qdev, virtio_gpu_reset_bh, g); qemu_cond_init(&g->reset_cond); QTAILQ_INIT(&g->reslist); QTAILQ_INIT(&g->cmdq); diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 257cda506a..683026adc4 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -4475,3 +4475,13 @@ QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev, return qemu_bh_new_full(cb, opaque, name, &transport->mem_reentrancy_guard); } + +QEMUBH *virtio_bh_io_new_guarded_full(DeviceState *dev, + QEMUBHFunc *cb, void *opaque, + const char *name) +{ + DeviceState *transport =3D qdev_get_parent_bus(dev)->parent; + + return aio_bh_new_full(iohandler_get_aio_context(), cb, opaque, name, + &transport->mem_reentrancy_guard); +} diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index d97529c3f1..d5bd921581 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -547,4 +547,14 @@ QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev, #define virtio_bh_new_guarded(dev, cb, opaque) \ virtio_bh_new_guarded_full((dev), (cb), (opaque), (stringify(cb))) =20 +/* + * The "_io" variant runs BH only on a main-loop thread, while generic BH + * may run on a vCPU thread. + */ +QEMUBH *virtio_bh_io_new_guarded_full(DeviceState *dev, + QEMUBHFunc *cb, void *opaque, + const char *name); +#define virtio_bh_io_new_guarded(dev, cb, opaque) \ + virtio_bh_io_new_guarded_full((dev), (cb), (opaque), (stringify(cb))) + #endif --=20 2.47.3