| Message ID | 20220310075211.4801-1-jasowang@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vhost: allow batching hint without size | expand |
Tested-by: Eli Cohen <elic@nvidia.com> > -----Original Message----- > From: Jason Wang <jasowang@redhat.com> > Sent: Thursday, March 10, 2022 9:52 AM > To: mst@redhat.com > Cc: kvm@vger.kernel.org; virtualization@lists.linux-foundation.org; netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Jason Wang > <jasowang@redhat.com>; Eli Cohen <elic@nvidia.com>; Anirudh Rayabharam <mail@anirudhrb.com> > Subject: [PATCH] vhost: allow batching hint without size > > Commit e2ae38cf3d91 ("vhost: fix hung thread due to erroneous iotlb > entries") tries to reject the IOTLB message whose size is zero. But > the size is not necessarily meaningful, one example is the batching > hint, so the commit breaks that. > > Fixing this be reject zero size message only if the message is used to > update/invalidate the IOTLB. > > Fixes: e2ae38cf3d91 ("vhost: fix hung thread due to erroneous iotlb entries") > Reported-by: Eli Cohen <elic@nvidia.com> > Cc: Anirudh Rayabharam <mail@anirudhrb.com> > Signed-off-by: Jason Wang <jasowang@redhat.com> > --- > drivers/vhost/vhost.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c > index 082380c03a3e..1768362115c6 100644 > --- a/drivers/vhost/vhost.c > +++ b/drivers/vhost/vhost.c > @@ -1170,7 +1170,9 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev, > goto done; > } > > - if (msg.size == 0) { > + if ((msg.type == VHOST_IOTLB_UPDATE || > + msg.type == VHOST_IOTLB_INVALIDATE) && > + msg.size == 0) { > ret = -EINVAL; > goto done; > } > -- > 2.18.1
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 082380c03a3e..1768362115c6 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1170,7 +1170,9 @@ ssize_t vhost_chr_write_iter(struct vhost_dev *dev, goto done; } - if (msg.size == 0) { + if ((msg.type == VHOST_IOTLB_UPDATE || + msg.type == VHOST_IOTLB_INVALIDATE) && + msg.size == 0) { ret = -EINVAL; goto done; }
Commit e2ae38cf3d91 ("vhost: fix hung thread due to erroneous iotlb entries") tries to reject the IOTLB message whose size is zero. But the size is not necessarily meaningful, one example is the batching hint, so the commit breaks that. Fixing this be reject zero size message only if the message is used to update/invalidate the IOTLB. Fixes: e2ae38cf3d91 ("vhost: fix hung thread due to erroneous iotlb entries") Reported-by: Eli Cohen <elic@nvidia.com> Cc: Anirudh Rayabharam <mail@anirudhrb.com> Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/vhost/vhost.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)