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Tsirkin" , Raphael Norwitz , Kevin Wolf , Hanna Reitz , Paolo Bonzini , Fam Zheng , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Viresh Kumar , qemu-block@nongnu.org (open list:Block layer core), qemu-devel@nongnu.org (open list:All patches CC here) Cc: Li Feng Subject: [PATCH v2 1/2] vhost-user: Fix lost reconnect Date: Thu, 24 Aug 2023 15:41:01 +0800 Message-ID: <20230824074115.93897-2-fengli@smartx.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230824074115.93897-1-fengli@smartx.com> References: <20230804052954.2918915-1-fengli@smartx.com> <20230824074115.93897-1-fengli@smartx.com> MIME-Version: 1.0 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: none client-ip=2607:f8b0:4864:20::62c; envelope-from=fengli@smartx.com; helo=mail-pl1-x62c.google.com X-Spam_score_int: 14 X-Spam_score: 1.4 X-Spam_bar: + X-Spam_report: (1.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_NONE=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 @smartx-com.20221208.gappssmtp.com) X-ZM-MESSAGEID: 1692863108644100003 Content-Type: text/plain; charset="utf-8" When the vhost-user is reconnecting to the backend, and if the vhost-user f= ails at the get_features in vhost_dev_init(), then the reconnect will fail and it will not be retriggered forever. The reason is: When the vhost-user fails at get_features, the vhost_dev_cleanup will be ca= lled immediately. vhost_dev_cleanup calls 'memset(hdev, 0, sizeof(struct vhost_dev))'. The reconnect path is: vhost_user_blk_event vhost_user_async_close(.. vhost_user_blk_disconnect ..) qemu_chr_fe_set_handlers <----- clear the notifier callback schedule vhost_user_async_close_bh The vhost->vdev is null, so the vhost_user_blk_disconnect will not be called, then the event fd callback will not be reinstalled. All vhost-user devices have this issue, including vhost-user-blk/scsi. With this patch, if the vdev->vdev is null, the fd callback will still be reinstalled. Fixes: 71e076a07d ("hw/virtio: generalise CHR_EVENT_CLOSED handling") Signed-off-by: Li Feng Reviewed-by: Raphael Norwitz --- hw/block/vhost-user-blk.c | 2 +- hw/scsi/vhost-user-scsi.c | 3 ++- hw/virtio/vhost-user-gpio.c | 2 +- hw/virtio/vhost-user.c | 10 ++++++++-- include/hw/virtio/vhost-user.h | 4 +++- 5 files changed, 15 insertions(+), 6 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 3c69fa47d5..95c758200d 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -391,7 +391,7 @@ static void vhost_user_blk_event(void *opaque, QEMUChrE= vent event) case CHR_EVENT_CLOSED: /* defer close until later to avoid circular close */ vhost_user_async_close(dev, &s->chardev, &s->dev, - vhost_user_blk_disconnect); + vhost_user_blk_disconnect, vhost_user_blk_e= vent); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index a7fa8e8df2..e931df9f5b 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -236,7 +236,8 @@ static void vhost_user_scsi_event(void *opaque, QEMUChr= Event event) case CHR_EVENT_CLOSED: /* defer close until later to avoid circular close */ vhost_user_async_close(dev, &vs->conf.chardev, &vsc->dev, - vhost_user_scsi_disconnect); + vhost_user_scsi_disconnect, + vhost_user_scsi_event); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: diff --git a/hw/virtio/vhost-user-gpio.c b/hw/virtio/vhost-user-gpio.c index d9979aa5db..04c2cc79f4 100644 --- a/hw/virtio/vhost-user-gpio.c +++ b/hw/virtio/vhost-user-gpio.c @@ -283,7 +283,7 @@ static void vu_gpio_event(void *opaque, QEMUChrEvent ev= ent) case CHR_EVENT_CLOSED: /* defer close until later to avoid circular close */ vhost_user_async_close(dev, &gpio->chardev, &gpio->vhost_dev, - vu_gpio_disconnect); + vu_gpio_disconnect, vu_gpio_event); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 8dcf049d42..9540766dd3 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -2643,6 +2643,7 @@ typedef struct { DeviceState *dev; CharBackend *cd; struct vhost_dev *vhost; + IOEventHandler *event_cb; } VhostAsyncCallback; =20 static void vhost_user_async_close_bh(void *opaque) @@ -2657,7 +2658,10 @@ static void vhost_user_async_close_bh(void *opaque) */ if (vhost->vdev) { data->cb(data->dev); - } + } else if (data->event_cb) { + qemu_chr_fe_set_handlers(data->cd, NULL, NULL, data->event_cb, + NULL, data->dev, NULL, true); + } =20 g_free(data); } @@ -2669,7 +2673,9 @@ static void vhost_user_async_close_bh(void *opaque) */ void vhost_user_async_close(DeviceState *d, CharBackend *chardev, struct vhost_dev *vhost, - vu_async_close_fn cb) + vu_async_close_fn cb, + IOEventHandler *event_cb + ) { if (!runstate_check(RUN_STATE_SHUTDOWN)) { /* diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h index 191216a74f..5fdc711d4e 100644 --- a/include/hw/virtio/vhost-user.h +++ b/include/hw/virtio/vhost-user.h @@ -84,6 +84,8 @@ typedef void (*vu_async_close_fn)(DeviceState *cb); =20 void vhost_user_async_close(DeviceState *d, CharBackend *chardev, struct vhost_dev *vhost, - vu_async_close_fn cb); + vu_async_close_fn cb, + IOEventHandler *event_cb + ); =20 #endif --=20 2.41.0