From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
To: Stefan Hajnoczi <stefanha@redhat.com>
Cc: virtio-fs@redhat.com, qemu-devel@nongnu.org, vgoyal@redhat.com,
groug@kaod.org
Subject: Re: [PATCH v3 03/26] DAX: vhost-user: Rework slave return values
Date: Thu, 27 May 2021 16:59:29 +0100 [thread overview]
Message-ID: <YK/B4TX7L/NHfNCQ@work-vm> (raw)
In-Reply-To: <YJFm+hocgArYnWAB@stefanha-x1.localdomain>
* Stefan Hajnoczi (stefanha@redhat.com) wrote:
> On Wed, Apr 28, 2021 at 12:00:37PM +0100, Dr. David Alan Gilbert (git) wrote:
> > From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> >
> > All the current slave handlers on the qemu side generate an 'int'
> > return value that's squashed down to a bool (!!ret) and stuffed into
> > a uint64_t (field of a union) to be returned.
> >
> > Move the uint64_t type back up through the individual handlers so
> > that we can make one actually return a full uint64_t.
> >
> > Note that the definition in the interop spec says most of these
> > cases are defined as returning 0 on success and non-0 for failure,
> > so it's OK to change from a bool to another non-0.
> >
> > Vivek:
> > This is needed because upcoming patches in series will add new functions
> > which want to return full error code. Existing functions continue to
> > return true/false so, it should not lead to change of behavior for
> > existing users.
> >
> > Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> > Reviewed-by: Greg Kurz <groug@kaod.org>
> > ---
> > hw/virtio/vhost-backend.c | 6 +++---
> > hw/virtio/vhost-user.c | 31 ++++++++++++++++---------------
> > include/hw/virtio/vhost-backend.h | 2 +-
> > 3 files changed, 20 insertions(+), 19 deletions(-)
> >
> > diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c
> > index 31b33bde37..1686c94767 100644
> > --- a/hw/virtio/vhost-backend.c
> > +++ b/hw/virtio/vhost-backend.c
> > @@ -401,8 +401,8 @@ int vhost_backend_invalidate_device_iotlb(struct vhost_dev *dev,
> > return -ENODEV;
> > }
> >
> > -int vhost_backend_handle_iotlb_msg(struct vhost_dev *dev,
> > - struct vhost_iotlb_msg *imsg)
> > +uint64_t vhost_backend_handle_iotlb_msg(struct vhost_dev *dev,
> > + struct vhost_iotlb_msg *imsg)
> > {
> > int ret = 0;
>
> This patch is messy. We want uint64_t but these functions use int ret
> internally. The actual return values are true/false instead of int 0 and
> 1.
Yeh.
> Please use uint64_t everywhere: return 0 for success and 1 for failure
> instead of bool literals and change the type of the local ret variables
> to uint64_t.
OK, reworked, this part of it now looks like :
int vhost_backend_handle_iotlb_msg(struct vhost_dev *dev,
- struct vhost_iotlb_msg *imsg)
+uint64_t vhost_backend_handle_iotlb_msg(struct vhost_dev *dev,
+ struct vhost_iotlb_msg *imsg)
{
- int ret = 0;
+ uint64_t ret = 0;
if (unlikely(!dev->vdev)) {
error_report("Unexpected IOTLB message when virtio device is stopped");
- return -EINVAL;
+ return EINVAL;
}
switch (imsg->type) {
case VHOST_IOTLB_MISS:
- ret = vhost_device_iotlb_miss(dev, imsg->iova,
- imsg->perm != VHOST_ACCESS_RO);
+ ret = -vhost_device_iotlb_miss(dev, imsg->iova,
+ imsg->perm != VHOST_ACCESS_RO);
break;
case VHOST_IOTLB_ACCESS_FAIL:
/* FIXME: report device iotlb error */
error_report("Access failure IOTLB message type not supported");
- ret = -ENOTSUP;
+ ret = ENOTSUP;
break;
case VHOST_IOTLB_UPDATE:
case VHOST_IOTLB_INVALIDATE:
default:
error_report("Unexpected IOTLB message type");
- ret = -EINVAL;
+ ret = EINVAL;
break;
}
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
next prev parent reply other threads:[~2021-05-27 16:02 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-28 11:00 [PATCH v3 00/26] virtiofs dax patches Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 01/26] virtiofs: Fixup printf args Dr. David Alan Gilbert (git)
2021-05-04 14:54 ` Stefan Hajnoczi
2021-05-05 11:06 ` Dr. David Alan Gilbert
2021-05-06 15:56 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 02/26] virtiofsd: Don't assume header layout Dr. David Alan Gilbert (git)
2021-05-04 15:12 ` Stefan Hajnoczi
2021-05-06 15:56 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 03/26] DAX: vhost-user: Rework slave return values Dr. David Alan Gilbert (git)
2021-05-04 15:23 ` Stefan Hajnoczi
2021-05-27 15:59 ` Dr. David Alan Gilbert [this message]
2021-04-28 11:00 ` [PATCH v3 04/26] DAX: libvhost-user: Route slave message payload Dr. David Alan Gilbert (git)
2021-05-04 15:26 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 05/26] DAX: libvhost-user: Allow popping a queue element with bad pointers Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 06/26] DAX subprojects/libvhost-user: Add virtio-fs slave types Dr. David Alan Gilbert (git)
2021-04-29 15:48 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 07/26] DAX: virtio: Add shared memory capability Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 08/26] DAX: virtio-fs: Add cache BAR Dr. David Alan Gilbert (git)
2021-05-05 12:12 ` Stefan Hajnoczi
2021-05-05 18:59 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 09/26] DAX: virtio-fs: Add vhost-user slave commands for mapping Dr. David Alan Gilbert (git)
2021-05-05 14:15 ` Stefan Hajnoczi
2021-05-27 16:57 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 10/26] DAX: virtio-fs: Fill in " Dr. David Alan Gilbert (git)
2021-05-05 16:43 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 11/26] DAX: virtiofsd Add cache accessor functions Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 12/26] DAX: virtiofsd: Add setup/remove mappings fuse commands Dr. David Alan Gilbert (git)
2021-05-06 15:02 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 13/26] DAX: virtiofsd: Add setup/remove mapping handlers to passthrough_ll Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 14/26] DAX: virtiofsd: Wire up passthrough_ll's lo_setupmapping Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 15/26] DAX: virtiofsd: Make lo_removemapping() work Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 16/26] DAX: virtiofsd: route se down to destroy method Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 17/26] DAX: virtiofsd: Perform an unmap on destroy Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 18/26] DAX/unmap: virtiofsd: Add VHOST_USER_SLAVE_FS_IO Dr. David Alan Gilbert (git)
2021-05-06 15:12 ` Stefan Hajnoczi
2021-05-27 17:44 ` Dr. David Alan Gilbert
2021-05-06 15:16 ` Stefan Hajnoczi
2021-05-27 17:31 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 19/26] DAX/unmap virtiofsd: Add wrappers for VHOST_USER_SLAVE_FS_IO Dr. David Alan Gilbert (git)
2021-04-28 12:53 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 20/26] DAX/unmap virtiofsd: Parse unmappable elements Dr. David Alan Gilbert (git)
2021-05-06 15:23 ` Stefan Hajnoczi
2021-05-27 17:56 ` Dr. David Alan Gilbert
2021-04-28 11:00 ` [PATCH v3 21/26] DAX/unmap virtiofsd: Route unmappable reads Dr. David Alan Gilbert (git)
2021-05-06 15:27 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 22/26] DAX/unmap virtiofsd: route unmappable write to slave command Dr. David Alan Gilbert (git)
2021-05-06 15:28 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 23/26] DAX:virtiofsd: implement FUSE_INIT map_alignment field Dr. David Alan Gilbert (git)
2021-04-28 11:00 ` [PATCH v3 24/26] vhost-user-fs: Extend VhostUserFSSlaveMsg to pass additional info Dr. David Alan Gilbert (git)
2021-05-06 15:31 ` Stefan Hajnoczi
2021-05-06 15:32 ` Stefan Hajnoczi
2021-04-28 11:00 ` [PATCH v3 25/26] vhost-user-fs: Implement drop CAP_FSETID functionality Dr. David Alan Gilbert (git)
2021-04-28 11:01 ` [PATCH v3 26/26] virtiofsd: Ask qemu to drop CAP_FSETID if client asked for it Dr. David Alan Gilbert (git)
2021-05-06 15:37 ` Stefan Hajnoczi
2021-05-06 16:02 ` Vivek Goyal
2021-05-10 9:05 ` Stefan Hajnoczi
2021-05-10 15:23 ` Vivek Goyal
2021-05-10 15:32 ` Stefan Hajnoczi
2021-05-27 19:09 ` Dr. David Alan Gilbert
2021-06-10 15:29 ` Dr. David Alan Gilbert
2021-06-10 16:23 ` Stefan Hajnoczi
2021-06-16 12:36 ` Dr. David Alan Gilbert
2021-06-16 15:29 ` Stefan Hajnoczi
2021-06-16 18:35 ` Dr. David Alan Gilbert
2021-04-28 11:27 ` [PATCH v3 00/26] virtiofs dax patches no-reply
2021-05-06 15:37 ` Stefan Hajnoczi
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