From patchwork Thu Jun 9 14:37:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Giuseppe Esposito X-Patchwork-Id: 12875762 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C5CD1C43334 for ; Thu, 9 Jun 2022 15:43:43 +0000 (UTC) Received: from localhost ([::1]:33862 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nzKJy-0002br-MZ for qemu-devel@archiver.kernel.org; Thu, 09 Jun 2022 11:43:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36354) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nzJI5-0002ND-M3 for qemu-devel@nongnu.org; Thu, 09 Jun 2022 10:37:41 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:36209) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nzJI2-00071q-7e for qemu-devel@nongnu.org; Thu, 09 Jun 2022 10:37:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1654785457; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Z6/zkzlz561dWh1RoYTIAHN4wuxuWznc6xg02g0zsGw=; b=FA/XSMhN8R19W5WvE5pHjeCqQJyo37BOmrt5+5lSGcD1/N/GNtYYlKv8A3XNRYf3J2G9iM 9Pok4MajMWCengKhlLeW+GjrhVSG4wnPGgnBHtfOSr3oxmSghssmiLfoXHmHRZ3m9aQ10/ WnmqyMMOBUSb/qlYgb7b5nBvspWxp+s= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-616-Fq-AJ-GZNWyzThLBW75Bjw-1; Thu, 09 Jun 2022 10:37:33 -0400 X-MC-Unique: Fq-AJ-GZNWyzThLBW75Bjw-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 5EF7738005CE; Thu, 9 Jun 2022 14:37:33 +0000 (UTC) Received: from virtlab701.virt.lab.eng.bos.redhat.com (virtlab701.virt.lab.eng.bos.redhat.com [10.19.152.228]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1F420492C3B; Thu, 9 Jun 2022 14:37:33 +0000 (UTC) From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Cc: Kevin Wolf , Hanna Reitz , Stefan Hajnoczi , "Michael S. Tsirkin" , Paolo Bonzini , Fam Zheng , qemu-devel@nongnu.org, Emanuele Giuseppe Esposito Subject: [PATCH 4/8] virtio: categorize callbacks in GS Date: Thu, 9 Jun 2022 10:37:23 -0400 Message-Id: <20220609143727.1151816-5-eesposit@redhat.com> In-Reply-To: <20220609143727.1151816-1-eesposit@redhat.com> References: <20220609143727.1151816-1-eesposit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eesposit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" All the callbacks below are always running in the main loop. The callbacks are the following: - start/stop_ioeventfd: these are the callbacks where blk_set_aio_context(iothread) is done, so they are called in the main loop. - save and load: called during migration, when VM is stopped from the main loop. - reset: before calling this callback, stop_ioeventfd is invoked, so it can only run in the main loop. - set_status: going through all the callers we can see it is called from a MemoryRegionOps callback, which always run in the main loop. - realize: iothread is not even created yet. Signed-off-by: Emanuele Giuseppe Esposito Acked-by: Michael S. Tsirkin Reviewed-by: Stefan Hajnoczi --- hw/block/virtio-blk.c | 2 ++ hw/virtio/virtio-bus.c | 5 +++++ hw/virtio/virtio-pci.c | 2 ++ hw/virtio/virtio.c | 8 ++++++++ 4 files changed, 17 insertions(+) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index 29a9c53ebc..4e6421c35e 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -1032,6 +1032,8 @@ static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status) { VirtIOBlock *s = VIRTIO_BLK(vdev); + GLOBAL_STATE_CODE(); + if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) { assert(!s->dataplane_started); } diff --git a/hw/virtio/virtio-bus.c b/hw/virtio/virtio-bus.c index d7ec023adf..0891ddb2ff 100644 --- a/hw/virtio/virtio-bus.c +++ b/hw/virtio/virtio-bus.c @@ -23,6 +23,7 @@ */ #include "qemu/osdep.h" +#include "qemu/main-loop.h" #include "qemu/error-report.h" #include "qemu/module.h" #include "qapi/error.h" @@ -223,6 +224,8 @@ int virtio_bus_start_ioeventfd(VirtioBusState *bus) VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); int r; + GLOBAL_STATE_CODE(); + if (!k->ioeventfd_assign || !k->ioeventfd_enabled(proxy)) { return -ENOSYS; } @@ -247,6 +250,8 @@ void virtio_bus_stop_ioeventfd(VirtioBusState *bus) VirtIODevice *vdev; VirtioDeviceClass *vdc; + GLOBAL_STATE_CODE(); + if (!bus->ioeventfd_started) { return; } diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 0566ad7d00..6798039391 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -301,6 +301,8 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); hwaddr pa; + GLOBAL_STATE_CODE(); + switch (addr) { case VIRTIO_PCI_GUEST_FEATURES: /* Guest does not negotiate properly? We have to assume nothing. */ diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 5d607aeaa0..2650504dd4 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -1977,6 +1977,8 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t val) VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); trace_virtio_set_status(vdev, val); + GLOBAL_STATE_CODE(); + if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && val & VIRTIO_CONFIG_S_FEATURES_OK) { @@ -2025,6 +2027,8 @@ void virtio_reset(void *opaque) VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); int i; + GLOBAL_STATE_CODE(); + virtio_set_status(vdev, 0); if (current_cpu) { /* Guest initiated reset */ @@ -2882,6 +2886,8 @@ int virtio_save(VirtIODevice *vdev, QEMUFile *f) uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff); int i; + GLOBAL_STATE_CODE(); + if (k->save_config) { k->save_config(qbus->parent, f); } @@ -3024,6 +3030,8 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); + GLOBAL_STATE_CODE(); + /* * We poison the endianness to ensure it does not get used before * subsections have been loaded.