From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f48.google.com (mail-wm1-f48.google.com [209.85.128.48]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 89E8D37C924 for ; Tue, 8 Sep 2026 05:39:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.48 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788845991; cv=none; b=n1DL7MkvljGYxGfbDwUaZQooKMfugMJDZNlR6DwS/G58YdiqgMOdg64NyjZ70dxdTliZIpG8ohvSBrByyhA0Wtv5w+EK7hhfz8bKfM2cgwTjXKx6ZBWrB9LzYMMY9f4/cBTq7LPXtFM+ZMtW1a/2K2eIdbXRo4ZC+WS07likPBA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788845991; c=relaxed/simple; bh=+h/0zeWFw84evQw0JV7uXbRDUk9bZb6gKcvHxLChX5o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=LcKtlWnZzi/AkOW3UbjgN5KODQWYXCvg9v32IJribd1jW9ICn4cMkVwUwo2Wn1cApMPnWXkg42xajvdNt0Xgv/VN1U0ZP8DDVOjOltLa/Fqv9ip9L+/bW7NM8kjzXeaQUyCDXjNwngfzCsk027atPf8TZKAUcjbc7pnzZ8UXauw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=sHuwC9Bh; arc=none smtp.client-ip=209.85.128.48 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="sHuwC9Bh" Received: by mail-wm1-f48.google.com with SMTP id 5b1f17b1804b1-499ae1c6471so40837955e9.3 for ; Mon, 07 Sep 2026 22:39:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1788845985; x=1789450785; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=PyvGIpKH+MV7CFSZeFmHniXCtrADstZbtULW+SJuxFg=; b=sHuwC9Bhp5zJInWrqmBxu6nKmmuz8oCAYfjUDOdy+MzmmMCZ8BHmkemWSq/lpT3/p9 djM+Fl9wI7+/uBR55wakXcithRh+RYU3GLhiQAs/ALwVNRmOrfNZlTOT7830giOknf7n AuJ2oPRDiDHok8eRz2Kob1oyQoaWiOPZJ+8OObXzXpiz14+TaJfJjC8be2dZ1P2QBpF+ V8gHXAlvqTd8RyEQACUeakK5nOOXhw85zHlE1u/0FdKWylSd1Y2JLrTt23fxYTaCqyA6 ua4V5hqMpEUfUe02pFlhWgIiMzAhFmhp+202aXNx5q2OYFXkzBzrts9Z4DO0mEb8Jl92 DmPw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788845985; x=1789450785; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=PyvGIpKH+MV7CFSZeFmHniXCtrADstZbtULW+SJuxFg=; b=UhQE/m70XXDkTqgYqy5p4ObQbMm+y7UDVvuC9AkpDrtLp7mix3p7gGu8ADbQqgpCNa TTuOXdByuf+WWWNMb0Z4hGrt2U7PTOSRbQ/KWgX7pbi7lQhvraGYWRrTyYqv5Mu4P1lg 1Fy9shFemAx2CXzN14zFhGeooTJBTKPHEMT2G6HA0PeWUh7v5Ocp0SdK20qhp2jVjzeZ GKUMk8VXNODmHTzWyQv/XXxokGnSEMZkC6t+n11HmaetQ8FyRsZTeifZc+K1vjUC1oZM af6TOzm3h9eSZlx/1cRAsr8UL2uVOsbg+V+NCmO9QKktU/TWIWKP9DT7zRbZsA51iaA1 r0TA== X-Forwarded-Encrypted: i=1; AKwUvBxFd+M1jga/m6WFF8YwoWGfXByNKGmW88WR1m+RnV+dymRucHXT9x3Z45jXIAQQ2fx8+fWtPI75MTlNOw==@vger.kernel.org X-Gm-Message-State: AFuF++lzUzeThLYuqnTvdYyL98Sn6IihTyyq2MQRIiwCXJYMDmzOL2SJ ctGpbXHsTQUYX22YWx0qHOrugi6mla7TDPZk8CNNrCQnWKxKxasICV+5 X-Gm-Gg: AYBFou1lSG4nS7hwNi6YD7yfwpcpnE3+kF24tXHCIlR7TNJqBfvGfUk6ha4LRmxIL9t Uxa5eA/50+8P/guh3Y7au6VXukxrZseFZNpSg/vQJr6ZmILkr5CyGLx177cCK+thHZicLcrx/nD y4o5dqaFRcY4ModV9922Gb8gSW0FdDT1X1pA1fFL+NjZ9jfh/5b1vyz4VLcW0jKqEY5rVh3Od2A exoRVfyjx1hmcjkdJcJv4Uyc4rpbOXQDxt4djgYbw63Hlo4F5z+kHrp4UAzu18PPzkMBbu6L9uw wG5+2buAvoWx3A+mJCmo98FpV7UqTFmwPi8d4sNTejfIVALdiFFXdUfb4lZXLaAocQloFhZrAN5 /Uz9uRZhCKdcwCWjkhpLC4kL+0emfokY0MKQW7wnHwMmirWPGmOrLDcSnwy4lQxY/n44WmN6dzX n0/kQ4K6sySU8TkCTVNnojexjicRSCoMiitUTBcSOkAaDA89O+AQbMsoy3gH5IcgVWEjXjTJimW JbHD2VspamIjjfswJT6pKdkGQqh3W4JEz1RqFoAg86tMhQt7XFdkNu2X4OMdn6xOG+F/bd7QlxM UOcm2fEqzKtF+xzwZyvvuHSYVkZ6DTI= X-Received: by 2002:a05:600c:a0a:b0:49c:e1f1:3dd5 with SMTP id 5b1f17b1804b1-49cf81e6cebmr470253545e9.4.1788845984552; Mon, 07 Sep 2026 22:39:44 -0700 (PDT) Received: from localhost.localdomain (dynamic-095-117-170-066.95.117.pool.telefonica.de. [95.117.170.66]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49cee7fec25sm523841335e9.13.2026.09.07.22.39.42 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 07 Sep 2026 22:39:44 -0700 (PDT) From: Karl Mehltretter To: "Michael S. Tsirkin" , Jason Wang , Gerd Hoffmann Cc: Karl Mehltretter , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Dmitry Torokhov , Rusty Russell , Pawel Moll , Cornelia Huck , Halil Pasic , Eric Farman , Richard Weinberger , Anton Ivanov , Johannes Berg , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , virtualization@lists.linux.dev, linux-input@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-um@lists.infradead.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle Subject: [PATCH v3 4/6] um: virtio_uml: implement synchronize_cbs() Date: Tue, 8 Sep 2026 07:38:15 +0200 Message-Id: <20260908053817.26065-5-kmehltretter@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20260908053817.26065-1-kmehltretter@gmail.com> References: <20260908053817.26065-1-kmehltretter@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit virtio_uml invokes virtqueue callbacks from vu_interrupt() and vu_req_interrupt(), which share vu_dev->irq. The core's synchronize_rcu() fallback already covers these IRQ handlers. Implement synchronize_cbs() with synchronize_irq() to synchronize with that IRQ instead of waiting for an RCU grace period. Assisted-by: LLM Signed-off-by: Karl Mehltretter --- arch/um/drivers/virtio_uml.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/um/drivers/virtio_uml.c b/arch/um/drivers/virtio_uml.c index 7425a8548141..1f2e62e29a27 100644 --- a/arch/um/drivers/virtio_uml.c +++ b/arch/um/drivers/virtio_uml.c @@ -20,6 +20,7 @@ * * Based on Virtio MMIO driver by Pawel Moll, copyright 2011-2014, ARM Ltd. */ +#include #include #include #include @@ -869,6 +870,14 @@ static void vu_reset(struct virtio_device *vdev) vu_dev->status = 0; } +static void vu_synchronize_cbs(struct virtio_device *vdev) +{ + struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev); + + if (vu_dev->irq != UM_IRQ_ALLOC) + synchronize_irq(vu_dev->irq); +} + static void vu_del_vq(struct virtqueue *vq) { struct virtio_uml_vq_info *info = vq->priv; @@ -1121,6 +1130,7 @@ static const struct virtio_config_ops virtio_uml_config_ops = { .reset = vu_reset, .find_vqs = vu_find_vqs, .del_vqs = vu_del_vqs, + .synchronize_cbs = vu_synchronize_cbs, .get_features = vu_get_features, .finalize_features = vu_finalize_features, .bus_name = vu_bus_name, -- 2.39.5 (Apple Git-154)