* [PATCH v2 1/2] Revert "vhost-user: fix lost reconnect" [not found] <20240513071052.129581-1-fengli@smartx.com> @ 2024-05-13 7:10 ` Li Feng 2024-05-13 7:15 ` Michael S. Tsirkin 2024-05-13 7:10 ` [PATCH v2 2/2] vhost-user: fix lost reconnect again Li Feng 1 sibling, 1 reply; 3+ messages in thread From: Li Feng @ 2024-05-13 7:10 UTC (permalink / raw) To: Michael S. Tsirkin, Raphael Norwitz, Kevin Wolf, Hanna Reitz, Paolo Bonzini, Fam Zheng, Alex Bennée, open list:Block layer core, open list:All patches CC here Cc: Yajun Wu, Stefano Garzarella This reverts commit f02a4b8e6431598612466f76aac64ab492849abf. Signed-off-by: Li Feng <fengli@smartx.com> --- hw/block/vhost-user-blk.c | 2 +- hw/scsi/vhost-user-scsi.c | 3 +-- hw/virtio/vhost-user-base.c | 2 +- hw/virtio/vhost-user.c | 10 ++-------- include/hw/virtio/vhost-user.h | 3 +-- 5 files changed, 6 insertions(+), 14 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 9e6bbc6950..41d1ac3a5a 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -384,7 +384,7 @@ static void vhost_user_blk_event(void *opaque, QEMUChrEvent 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_event); + vhost_user_blk_disconnect); 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 a63b1f4948..48a59e020e 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -214,8 +214,7 @@ static void vhost_user_scsi_event(void *opaque, QEMUChrEvent 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_event); + vhost_user_scsi_disconnect); break; case CHR_EVENT_BREAK: case CHR_EVENT_MUX_IN: diff --git a/hw/virtio/vhost-user-base.c b/hw/virtio/vhost-user-base.c index a83167191e..4b54255682 100644 --- a/hw/virtio/vhost-user-base.c +++ b/hw/virtio/vhost-user-base.c @@ -254,7 +254,7 @@ static void vub_event(void *opaque, QEMUChrEvent event) case CHR_EVENT_CLOSED: /* defer close until later to avoid circular close */ vhost_user_async_close(dev, &vub->chardev, &vub->vhost_dev, - vub_disconnect, vub_event); + vub_disconnect); 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 cdf9af4a4b..c929097e87 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -2776,7 +2776,6 @@ typedef struct { DeviceState *dev; CharBackend *cd; struct vhost_dev *vhost; - IOEventHandler *event_cb; } VhostAsyncCallback; static void vhost_user_async_close_bh(void *opaque) @@ -2791,10 +2790,7 @@ 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); - } + } g_free(data); } @@ -2806,8 +2802,7 @@ 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, - IOEventHandler *event_cb) + vu_async_close_fn cb) { if (!runstate_check(RUN_STATE_SHUTDOWN)) { /* @@ -2823,7 +2818,6 @@ void vhost_user_async_close(DeviceState *d, data->dev = d; data->cd = chardev; data->vhost = vhost; - data->event_cb = event_cb; /* Disable any further notifications on the chardev */ qemu_chr_fe_set_handlers(chardev, diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h index d7c09ffd34..324cd8663a 100644 --- a/include/hw/virtio/vhost-user.h +++ b/include/hw/virtio/vhost-user.h @@ -108,7 +108,6 @@ typedef void (*vu_async_close_fn)(DeviceState *cb); void vhost_user_async_close(DeviceState *d, CharBackend *chardev, struct vhost_dev *vhost, - vu_async_close_fn cb, - IOEventHandler *event_cb); + vu_async_close_fn cb); #endif -- 2.45.0 ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2 1/2] Revert "vhost-user: fix lost reconnect" 2024-05-13 7:10 ` [PATCH v2 1/2] Revert "vhost-user: fix lost reconnect" Li Feng @ 2024-05-13 7:15 ` Michael S. Tsirkin 0 siblings, 0 replies; 3+ messages in thread From: Michael S. Tsirkin @ 2024-05-13 7:15 UTC (permalink / raw) To: Li Feng Cc: Raphael Norwitz, Kevin Wolf, Hanna Reitz, Paolo Bonzini, Fam Zheng, Alex Bennée, open list:Block layer core, open list:All patches CC here, Yajun Wu, Stefano Garzarella On Mon, May 13, 2024 at 03:10:47PM +0800, Li Feng wrote: > This reverts commit f02a4b8e6431598612466f76aac64ab492849abf. > include subject of reverted commit and motivation for the revert pls. > Signed-off-by: Li Feng <fengli@smartx.com> > --- > hw/block/vhost-user-blk.c | 2 +- > hw/scsi/vhost-user-scsi.c | 3 +-- > hw/virtio/vhost-user-base.c | 2 +- > hw/virtio/vhost-user.c | 10 ++-------- > include/hw/virtio/vhost-user.h | 3 +-- > 5 files changed, 6 insertions(+), 14 deletions(-) > > diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c > index 9e6bbc6950..41d1ac3a5a 100644 > --- a/hw/block/vhost-user-blk.c > +++ b/hw/block/vhost-user-blk.c > @@ -384,7 +384,7 @@ static void vhost_user_blk_event(void *opaque, QEMUChrEvent 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_event); > + vhost_user_blk_disconnect); > 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 a63b1f4948..48a59e020e 100644 > --- a/hw/scsi/vhost-user-scsi.c > +++ b/hw/scsi/vhost-user-scsi.c > @@ -214,8 +214,7 @@ static void vhost_user_scsi_event(void *opaque, QEMUChrEvent 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_event); > + vhost_user_scsi_disconnect); > break; > case CHR_EVENT_BREAK: > case CHR_EVENT_MUX_IN: > diff --git a/hw/virtio/vhost-user-base.c b/hw/virtio/vhost-user-base.c > index a83167191e..4b54255682 100644 > --- a/hw/virtio/vhost-user-base.c > +++ b/hw/virtio/vhost-user-base.c > @@ -254,7 +254,7 @@ static void vub_event(void *opaque, QEMUChrEvent event) > case CHR_EVENT_CLOSED: > /* defer close until later to avoid circular close */ > vhost_user_async_close(dev, &vub->chardev, &vub->vhost_dev, > - vub_disconnect, vub_event); > + vub_disconnect); > 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 cdf9af4a4b..c929097e87 100644 > --- a/hw/virtio/vhost-user.c > +++ b/hw/virtio/vhost-user.c > @@ -2776,7 +2776,6 @@ typedef struct { > DeviceState *dev; > CharBackend *cd; > struct vhost_dev *vhost; > - IOEventHandler *event_cb; > } VhostAsyncCallback; > > static void vhost_user_async_close_bh(void *opaque) > @@ -2791,10 +2790,7 @@ 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); > - } > + } > > g_free(data); > } > @@ -2806,8 +2802,7 @@ 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, > - IOEventHandler *event_cb) > + vu_async_close_fn cb) > { > if (!runstate_check(RUN_STATE_SHUTDOWN)) { > /* > @@ -2823,7 +2818,6 @@ void vhost_user_async_close(DeviceState *d, > data->dev = d; > data->cd = chardev; > data->vhost = vhost; > - data->event_cb = event_cb; > > /* Disable any further notifications on the chardev */ > qemu_chr_fe_set_handlers(chardev, > diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h > index d7c09ffd34..324cd8663a 100644 > --- a/include/hw/virtio/vhost-user.h > +++ b/include/hw/virtio/vhost-user.h > @@ -108,7 +108,6 @@ typedef void (*vu_async_close_fn)(DeviceState *cb); > > void vhost_user_async_close(DeviceState *d, > CharBackend *chardev, struct vhost_dev *vhost, > - vu_async_close_fn cb, > - IOEventHandler *event_cb); > + vu_async_close_fn cb); > > #endif > -- > 2.45.0 ^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH v2 2/2] vhost-user: fix lost reconnect again [not found] <20240513071052.129581-1-fengli@smartx.com> 2024-05-13 7:10 ` [PATCH v2 1/2] Revert "vhost-user: fix lost reconnect" Li Feng @ 2024-05-13 7:10 ` Li Feng 1 sibling, 0 replies; 3+ messages in thread From: Li Feng @ 2024-05-13 7:10 UTC (permalink / raw) To: Raphael Norwitz, Michael S. Tsirkin, Kevin Wolf, Hanna Reitz, Paolo Bonzini, Fam Zheng, Alex Bennée, open list:Block layer core, open list:All patches CC here Cc: Yajun Wu, Stefano Garzarella When the vhost-user is reconnecting to the backend, and if the vhost-user fails 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 fail at get_features, the vhost_dev_cleanup will be called 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. With this patch, the vhost_user_blk_disconnect will call the vhost_dev_cleanup() again, it's safe. In addition, the CLOSE event may occur in a scenario where connected is false. At this time, the event handler will be cleared. We need to ensure that the event handler can remain installed. All vhost-user devices have this issue, including vhost-user-blk/scsi. Fixes: 71e076a07d ("hw/virtio: generalise CHR_EVENT_CLOSED handling") Signed-off-by: Li Feng <fengli@smartx.com> --- hw/block/vhost-user-blk.c | 3 ++- hw/scsi/vhost-user-scsi.c | 3 ++- hw/virtio/vhost-user-base.c | 3 ++- hw/virtio/vhost-user.c | 10 +--------- 4 files changed, 7 insertions(+), 12 deletions(-) diff --git a/hw/block/vhost-user-blk.c b/hw/block/vhost-user-blk.c index 41d1ac3a5a..c6842ced48 100644 --- a/hw/block/vhost-user-blk.c +++ b/hw/block/vhost-user-blk.c @@ -353,7 +353,7 @@ static void vhost_user_blk_disconnect(DeviceState *dev) VHostUserBlk *s = VHOST_USER_BLK(vdev); if (!s->connected) { - return; + goto done; } s->connected = false; @@ -361,6 +361,7 @@ static void vhost_user_blk_disconnect(DeviceState *dev) vhost_dev_cleanup(&s->dev); +done: /* Re-instate the event handler for new connections */ qemu_chr_fe_set_handlers(&s->chardev, NULL, NULL, vhost_user_blk_event, NULL, dev, NULL, true); diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index 48a59e020e..b49a11d23b 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -181,7 +181,7 @@ static void vhost_user_scsi_disconnect(DeviceState *dev) VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev); if (!s->connected) { - return; + goto done; } s->connected = false; @@ -189,6 +189,7 @@ static void vhost_user_scsi_disconnect(DeviceState *dev) vhost_dev_cleanup(&vsc->dev); +done: /* Re-instate the event handler for new connections */ qemu_chr_fe_set_handlers(&vs->conf.chardev, NULL, NULL, vhost_user_scsi_event, NULL, dev, NULL, true); diff --git a/hw/virtio/vhost-user-base.c b/hw/virtio/vhost-user-base.c index 4b54255682..11e72b1e3b 100644 --- a/hw/virtio/vhost-user-base.c +++ b/hw/virtio/vhost-user-base.c @@ -225,13 +225,14 @@ static void vub_disconnect(DeviceState *dev) VHostUserBase *vub = VHOST_USER_BASE(vdev); if (!vub->connected) { - return; + goto done; } vub->connected = false; vub_stop(vdev); vhost_dev_cleanup(&vub->vhost_dev); +done: /* Re-instate the event handler for new connections */ qemu_chr_fe_set_handlers(&vub->chardev, NULL, NULL, vub_event, diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index c929097e87..c407ea8939 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -2781,16 +2781,8 @@ typedef struct { static void vhost_user_async_close_bh(void *opaque) { VhostAsyncCallback *data = opaque; - struct vhost_dev *vhost = data->vhost; - /* - * If the vhost_dev has been cleared in the meantime there is - * nothing left to do as some other path has completed the - * cleanup. - */ - if (vhost->vdev) { - data->cb(data->dev); - } + data->cb(data->dev); g_free(data); } -- 2.45.0 ^ permalink raw reply related [flat|nested] 3+ messages in thread
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2024-05-13 7:10 ` [PATCH v2 1/2] Revert "vhost-user: fix lost reconnect" Li Feng
2024-05-13 7:15 ` Michael S. Tsirkin
2024-05-13 7:10 ` [PATCH v2 2/2] vhost-user: fix lost reconnect again Li Feng
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