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Re: [PATCH v3 2/2] vhost-user: remove VirtQ notifier restore
From: |
Xueming(Steven) Li |
Subject: |
Re: [PATCH v3 2/2] vhost-user: remove VirtQ notifier restore |
Date: |
Tue, 19 Oct 2021 07:21:24 +0000 |
User-agent: |
Evolution 3.40.4 |
On Tue, 2021-10-19 at 02:37 -0400, Michael S. Tsirkin wrote:
> On Fri, Oct 08, 2021 at 03:58:05PM +0800, Xueming Li wrote:
> > When vhost-user vdpa client restart, VQ notifier resources become
> > invalid, no need to keep mmap, vdpa client will set VQ notifier after
> > reconnect.
> >
> > Removes VQ notifier restore and related flags.
> >
> > Fixes: 44866521bd6e ("vhost-user: support registering external host
> > notifiers")
> > Cc: tiwei.bie@intel.com
> > Cc: qemu-stable@nongnu.org
> > Cc: Yuwei Zhang <zhangyuwei.9149@bytedance.com>
> > Signed-off-by: Xueming Li <xuemingl@nvidia.com>
>
> Pls fix up bisect and repost.
> Also, can you please clarify what does "no need" mean?
mmap becomes invalid, need to unmap it.
> You include a Fixes tag but is there a bug? What behaviour
> are you trying to fix? A resource leak?
> Or are you just simplifying code?
> If the later then no need for a Fixes tag.
Yes, just simplifying code, will remove it.
>
>
>
>
> > ---
> > hw/virtio/vhost-user.c | 20 ++------------------
> > include/hw/virtio/vhost-user.h | 1 -
> > 2 files changed, 2 insertions(+), 19 deletions(-)
> >
> > diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
> > index b2e948bdc7..d127aa478a 100644
> > --- a/hw/virtio/vhost-user.c
> > +++ b/hw/virtio/vhost-user.c
> > @@ -22,6 +22,7 @@
> > #include "qemu/main-loop.h"
> > #include "qemu/sockets.h"
> > #include "sysemu/cryptodev.h"
> > +#include "sysemu/cpus.h"
> > #include "migration/migration.h"
> > #include "migration/postcopy-ram.h"
> > #include "trace.h"
> > @@ -1143,19 +1144,6 @@ static int vhost_user_set_vring_num(struct vhost_dev
> > *dev,
> > return vhost_set_vring(dev, VHOST_USER_SET_VRING_NUM, ring);
> > }
> >
> > -static void vhost_user_host_notifier_restore(struct vhost_dev *dev,
> > - int queue_idx)
> > -{
> > - struct vhost_user *u = dev->opaque;
> > - VhostUserHostNotifier *n = &u->user->notifier[queue_idx];
> > - VirtIODevice *vdev = dev->vdev;
> > -
> > - if (n->addr && !n->set) {
> > - virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, true);
> > - n->set = true;
> > - }
> > -}
> > -
> > static void vhost_user_host_notifier_remove(struct vhost_dev *dev,
> > int queue_idx)
> > {
> > @@ -1163,7 +1151,7 @@ static void vhost_user_host_notifier_remove(struct
> > vhost_dev *dev,
> > VhostUserHostNotifier *n = &u->user->notifier[queue_idx];
> > VirtIODevice *vdev = dev->vdev;
> >
> > - if (n->addr && n->set) {
> > + if (n->addr) {
> > virtio_queue_set_host_notifier_mr(vdev, queue_idx, &n->mr, false);
> > if (!qemu_in_vcpu_thread()) { /* Avoid vCPU dead lock. */
> > /* Wait for VM threads accessing old flatview which contains
> > notifier. */
> > @@ -1171,15 +1159,12 @@ static void vhost_user_host_notifier_remove(struct
> > vhost_dev *dev,
> > }
> > munmap(n->addr, qemu_real_host_page_size);
> > n->addr = NULL;
> > - n->set = false;
> > }
> > }
> >
> > static int vhost_user_set_vring_base(struct vhost_dev *dev,
> > struct vhost_vring_state *ring)
> > {
> > - vhost_user_host_notifier_restore(dev, ring->index);
> > -
> > return vhost_set_vring(dev, VHOST_USER_SET_VRING_BASE, ring);
> > }
> >
> > @@ -1539,7 +1524,6 @@ static int
> > vhost_user_slave_handle_vring_host_notifier(struct vhost_dev *dev,
> > }
> >
> > n->addr = addr;
> > - n->set = true;
> >
> > return 0;
> > }
> > diff --git a/include/hw/virtio/vhost-user.h b/include/hw/virtio/vhost-user.h
> > index a9abca3288..f6012b2078 100644
> > --- a/include/hw/virtio/vhost-user.h
> > +++ b/include/hw/virtio/vhost-user.h
> > @@ -14,7 +14,6 @@
> > typedef struct VhostUserHostNotifier {
> > MemoryRegion mr;
> > void *addr;
> > - bool set;
> > } VhostUserHostNotifier;
> >
> > typedef struct VhostUserState {
> > --
> > 2.33.0
>