* [Qemu-devel] [PATCH] virtio-9p: add savem handlers
@ 2015-10-22 17:38 Greg Kurz
2015-11-12 8:28 ` Greg Kurz
0 siblings, 1 reply; 6+ messages in thread
From: Greg Kurz @ 2015-10-22 17:38 UTC (permalink / raw)
To: qemu-devel; +Cc: aneesh.kumar, Michael S. Tsirkin
We don't support migration of mounted 9p shares. This is handled by a
migration blocker.
One would expect, however, to be able to migrate if the share is unmounted.
Unfortunately virtio-9p-device does not register savevm handlers at all !
Migration succeeds and leaves the guest with a dangling device...
This patch simply registers migration handlers for virtio-9p-device. Whether
migration is possible or not still depends on the migration blocker.
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
---
Michael, Aneesh,
This is the same patch minus the call to unregister_savevm() since we don't
have an unrealize handler.
I decided to simply drop all the other patches. Hot-unplug support is totally
missing and definitely needs more work. I'll try to come up with a solution
in its own series.
Cheers.
--
Greg
---
hw/9pfs/virtio-9p-device.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index 93a407c45926..e3abcfaffb2a 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -43,6 +43,16 @@ static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
g_free(cfg);
}
+static void virtio_9p_save(QEMUFile *f, void *opaque)
+{
+ virtio_save(VIRTIO_DEVICE(opaque), f);
+}
+
+static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
+{
+ return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
+}
+
static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
@@ -130,6 +140,7 @@ static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
}
v9fs_path_free(&path);
+ register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, s);
return;
out:
g_free(s->ctx.fs_root);
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH] virtio-9p: add savem handlers
2015-10-22 17:38 [Qemu-devel] [PATCH] virtio-9p: add savem handlers Greg Kurz
@ 2015-11-12 8:28 ` Greg Kurz
2015-11-12 12:50 ` Cornelia Huck
0 siblings, 1 reply; 6+ messages in thread
From: Greg Kurz @ 2015-11-12 8:28 UTC (permalink / raw)
To: qemu-devel; +Cc: aneesh.kumar, Michael S. Tsirkin
On Thu, 22 Oct 2015 19:38:42 +0200
Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> We don't support migration of mounted 9p shares. This is handled by a
> migration blocker.
>
> One would expect, however, to be able to migrate if the share is unmounted.
> Unfortunately virtio-9p-device does not register savevm handlers at all !
> Migration succeeds and leaves the guest with a dangling device...
>
> This patch simply registers migration handlers for virtio-9p-device. Whether
> migration is possible or not still depends on the migration blocker.
>
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> ---
Ping ?
> Michael, Aneesh,
>
> This is the same patch minus the call to unregister_savevm() since we don't
> have an unrealize handler.
>
> I decided to simply drop all the other patches. Hot-unplug support is totally
> missing and definitely needs more work. I'll try to come up with a solution
> in its own series.
>
> Cheers.
>
> --
> Greg
>
> ---
> hw/9pfs/virtio-9p-device.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> index 93a407c45926..e3abcfaffb2a 100644
> --- a/hw/9pfs/virtio-9p-device.c
> +++ b/hw/9pfs/virtio-9p-device.c
> @@ -43,6 +43,16 @@ static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
> g_free(cfg);
> }
>
> +static void virtio_9p_save(QEMUFile *f, void *opaque)
> +{
> + virtio_save(VIRTIO_DEVICE(opaque), f);
> +}
> +
> +static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
> +{
> + return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
> +}
> +
> static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> {
> VirtIODevice *vdev = VIRTIO_DEVICE(dev);
> @@ -130,6 +140,7 @@ static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> }
> v9fs_path_free(&path);
>
> + register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, s);
> return;
> out:
> g_free(s->ctx.fs_root);
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH] virtio-9p: add savem handlers
2015-11-12 8:28 ` Greg Kurz
@ 2015-11-12 12:50 ` Cornelia Huck
2015-11-12 14:25 ` Greg Kurz
0 siblings, 1 reply; 6+ messages in thread
From: Cornelia Huck @ 2015-11-12 12:50 UTC (permalink / raw)
To: Greg Kurz; +Cc: Michael S. Tsirkin, qemu-devel, aneesh.kumar
On Thu, 12 Nov 2015 09:28:21 +0100
Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> On Thu, 22 Oct 2015 19:38:42 +0200
> Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
>
> > We don't support migration of mounted 9p shares. This is handled by a
> > migration blocker.
> >
> > One would expect, however, to be able to migrate if the share is unmounted.
> > Unfortunately virtio-9p-device does not register savevm handlers at all !
> > Migration succeeds and leaves the guest with a dangling device...
> >
> > This patch simply registers migration handlers for virtio-9p-device. Whether
> > migration is possible or not still depends on the migration blocker.
> >
> > Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> > ---
>
> Ping ?
>
> > Michael, Aneesh,
> >
> > This is the same patch minus the call to unregister_savevm() since we don't
> > have an unrealize handler.
> >
> > I decided to simply drop all the other patches. Hot-unplug support is totally
> > missing and definitely needs more work. I'll try to come up with a solution
> > in its own series.
> >
> > Cheers.
> >
> > --
> > Greg
> >
> > ---
> > hw/9pfs/virtio-9p-device.c | 11 +++++++++++
> > 1 file changed, 11 insertions(+)
> >
> > diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> > index 93a407c45926..e3abcfaffb2a 100644
> > --- a/hw/9pfs/virtio-9p-device.c
> > +++ b/hw/9pfs/virtio-9p-device.c
> > @@ -43,6 +43,16 @@ static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
> > g_free(cfg);
> > }
> >
> > +static void virtio_9p_save(QEMUFile *f, void *opaque)
> > +{
> > + virtio_save(VIRTIO_DEVICE(opaque), f);
> > +}
> > +
> > +static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
> > +{
> > + return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
> > +}
> > +
> > static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> > {
> > VirtIODevice *vdev = VIRTIO_DEVICE(dev);
> > @@ -130,6 +140,7 @@ static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> > }
> > v9fs_path_free(&path);
> >
> > + register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, s);
> > return;
> > out:
> > g_free(s->ctx.fs_root);
Probably dumb question: Is there no state in the V9fsState, or is it
simply irrelevant if there are no mounts?
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH] virtio-9p: add savem handlers
2015-11-12 12:50 ` Cornelia Huck
@ 2015-11-12 14:25 ` Greg Kurz
2015-11-12 14:39 ` Cornelia Huck
0 siblings, 1 reply; 6+ messages in thread
From: Greg Kurz @ 2015-11-12 14:25 UTC (permalink / raw)
To: Cornelia Huck; +Cc: Michael S. Tsirkin, qemu-devel, aneesh.kumar
On Thu, 12 Nov 2015 13:50:20 +0100
Cornelia Huck <cornelia.huck@de.ibm.com> wrote:
> On Thu, 12 Nov 2015 09:28:21 +0100
> Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
>
> > On Thu, 22 Oct 2015 19:38:42 +0200
> > Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> >
> > > We don't support migration of mounted 9p shares. This is handled by a
> > > migration blocker.
> > >
> > > One would expect, however, to be able to migrate if the share is unmounted.
> > > Unfortunately virtio-9p-device does not register savevm handlers at all !
> > > Migration succeeds and leaves the guest with a dangling device...
> > >
> > > This patch simply registers migration handlers for virtio-9p-device. Whether
> > > migration is possible or not still depends on the migration blocker.
> > >
> > > Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> > > ---
> >
> > Ping ?
> >
> > > Michael, Aneesh,
> > >
> > > This is the same patch minus the call to unregister_savevm() since we don't
> > > have an unrealize handler.
> > >
> > > I decided to simply drop all the other patches. Hot-unplug support is totally
> > > missing and definitely needs more work. I'll try to come up with a solution
> > > in its own series.
> > >
> > > Cheers.
> > >
> > > --
> > > Greg
> > >
> > > ---
> > > hw/9pfs/virtio-9p-device.c | 11 +++++++++++
> > > 1 file changed, 11 insertions(+)
> > >
> > > diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> > > index 93a407c45926..e3abcfaffb2a 100644
> > > --- a/hw/9pfs/virtio-9p-device.c
> > > +++ b/hw/9pfs/virtio-9p-device.c
> > > @@ -43,6 +43,16 @@ static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
> > > g_free(cfg);
> > > }
> > >
> > > +static void virtio_9p_save(QEMUFile *f, void *opaque)
> > > +{
> > > + virtio_save(VIRTIO_DEVICE(opaque), f);
> > > +}
> > > +
> > > +static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
> > > +{
> > > + return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
> > > +}
> > > +
> > > static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> > > {
> > > VirtIODevice *vdev = VIRTIO_DEVICE(dev);
> > > @@ -130,6 +140,7 @@ static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> > > }
> > > v9fs_path_free(&path);
> > >
> > > + register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, s);
> > > return;
> > > out:
> > > g_free(s->ctx.fs_root);
>
> Probably dumb question: Is there no state in the V9fsState, or is it
> simply irrelevant if there are no mounts?
My understanding is that V9fsState has state but it is not used when
there are no mounts... maybe worth mentioning in a comment or in the
changelog ?
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH] virtio-9p: add savem handlers
2015-11-12 14:25 ` Greg Kurz
@ 2015-11-12 14:39 ` Cornelia Huck
2015-11-12 16:06 ` Greg Kurz
0 siblings, 1 reply; 6+ messages in thread
From: Cornelia Huck @ 2015-11-12 14:39 UTC (permalink / raw)
To: Greg Kurz; +Cc: Michael S. Tsirkin, qemu-devel, aneesh.kumar
On Thu, 12 Nov 2015 15:25:33 +0100
Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> On Thu, 12 Nov 2015 13:50:20 +0100
> Cornelia Huck <cornelia.huck@de.ibm.com> wrote:
>
> > On Thu, 12 Nov 2015 09:28:21 +0100
> > Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> >
> > > On Thu, 22 Oct 2015 19:38:42 +0200
> > > Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> > >
> > > > We don't support migration of mounted 9p shares. This is handled by a
> > > > migration blocker.
> > > >
> > > > One would expect, however, to be able to migrate if the share is unmounted.
> > > > Unfortunately virtio-9p-device does not register savevm handlers at all !
> > > > Migration succeeds and leaves the guest with a dangling device...
> > > >
> > > > This patch simply registers migration handlers for virtio-9p-device. Whether
> > > > migration is possible or not still depends on the migration blocker.
> > > >
> > > > Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> > > > ---
> > >
> > > Ping ?
> > >
> > > > Michael, Aneesh,
> > > >
> > > > This is the same patch minus the call to unregister_savevm() since we don't
> > > > have an unrealize handler.
> > > >
> > > > I decided to simply drop all the other patches. Hot-unplug support is totally
> > > > missing and definitely needs more work. I'll try to come up with a solution
> > > > in its own series.
> > > >
> > > > Cheers.
> > > >
> > > > --
> > > > Greg
> > > >
> > > > ---
> > > > hw/9pfs/virtio-9p-device.c | 11 +++++++++++
> > > > 1 file changed, 11 insertions(+)
> > > >
> > > > diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> > > > index 93a407c45926..e3abcfaffb2a 100644
> > > > --- a/hw/9pfs/virtio-9p-device.c
> > > > +++ b/hw/9pfs/virtio-9p-device.c
> > > > @@ -43,6 +43,16 @@ static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
> > > > g_free(cfg);
> > > > }
> > > >
> > > > +static void virtio_9p_save(QEMUFile *f, void *opaque)
> > > > +{
> > > > + virtio_save(VIRTIO_DEVICE(opaque), f);
> > > > +}
> > > > +
> > > > +static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
> > > > +{
> > > > + return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
> > > > +}
> > > > +
> > > > static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> > > > {
> > > > VirtIODevice *vdev = VIRTIO_DEVICE(dev);
> > > > @@ -130,6 +140,7 @@ static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> > > > }
> > > > v9fs_path_free(&path);
> > > >
> > > > + register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, s);
> > > > return;
> > > > out:
> > > > g_free(s->ctx.fs_root);
> >
> > Probably dumb question: Is there no state in the V9fsState, or is it
> > simply irrelevant if there are no mounts?
>
> My understanding is that V9fsState has state but it is not used when
> there are no mounts... maybe worth mentioning in a comment or in the
> changelog ?
If V9fsState will look sensible after migration if there are no mounts,
I think it's worth adding a comment in the code.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [Qemu-devel] [PATCH] virtio-9p: add savem handlers
2015-11-12 14:39 ` Cornelia Huck
@ 2015-11-12 16:06 ` Greg Kurz
0 siblings, 0 replies; 6+ messages in thread
From: Greg Kurz @ 2015-11-12 16:06 UTC (permalink / raw)
To: Cornelia Huck; +Cc: Michael S. Tsirkin, qemu-devel, aneesh.kumar
On Thu, 12 Nov 2015 15:39:02 +0100
Cornelia Huck <cornelia.huck@de.ibm.com> wrote:
> On Thu, 12 Nov 2015 15:25:33 +0100
> Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
>
> > On Thu, 12 Nov 2015 13:50:20 +0100
> > Cornelia Huck <cornelia.huck@de.ibm.com> wrote:
> >
> > > On Thu, 12 Nov 2015 09:28:21 +0100
> > > Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> > >
> > > > On Thu, 22 Oct 2015 19:38:42 +0200
> > > > Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> > > >
> > > > > We don't support migration of mounted 9p shares. This is handled by a
> > > > > migration blocker.
> > > > >
> > > > > One would expect, however, to be able to migrate if the share is unmounted.
> > > > > Unfortunately virtio-9p-device does not register savevm handlers at all !
> > > > > Migration succeeds and leaves the guest with a dangling device...
> > > > >
> > > > > This patch simply registers migration handlers for virtio-9p-device. Whether
> > > > > migration is possible or not still depends on the migration blocker.
> > > > >
> > > > > Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> > > > > ---
> > > >
> > > > Ping ?
> > > >
> > > > > Michael, Aneesh,
> > > > >
> > > > > This is the same patch minus the call to unregister_savevm() since we don't
> > > > > have an unrealize handler.
> > > > >
> > > > > I decided to simply drop all the other patches. Hot-unplug support is totally
> > > > > missing and definitely needs more work. I'll try to come up with a solution
> > > > > in its own series.
> > > > >
> > > > > Cheers.
> > > > >
> > > > > --
> > > > > Greg
> > > > >
> > > > > ---
> > > > > hw/9pfs/virtio-9p-device.c | 11 +++++++++++
> > > > > 1 file changed, 11 insertions(+)
> > > > >
> > > > > diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> > > > > index 93a407c45926..e3abcfaffb2a 100644
> > > > > --- a/hw/9pfs/virtio-9p-device.c
> > > > > +++ b/hw/9pfs/virtio-9p-device.c
> > > > > @@ -43,6 +43,16 @@ static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
> > > > > g_free(cfg);
> > > > > }
> > > > >
> > > > > +static void virtio_9p_save(QEMUFile *f, void *opaque)
> > > > > +{
> > > > > + virtio_save(VIRTIO_DEVICE(opaque), f);
> > > > > +}
> > > > > +
> > > > > +static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
> > > > > +{
> > > > > + return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
> > > > > +}
> > > > > +
> > > > > static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> > > > > {
> > > > > VirtIODevice *vdev = VIRTIO_DEVICE(dev);
> > > > > @@ -130,6 +140,7 @@ static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
> > > > > }
> > > > > v9fs_path_free(&path);
> > > > >
> > > > > + register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, s);
> > > > > return;
> > > > > out:
> > > > > g_free(s->ctx.fs_root);
> > >
> > > Probably dumb question: Is there no state in the V9fsState, or is it
> > > simply irrelevant if there are no mounts?
> >
> > My understanding is that V9fsState has state but it is not used when
> > there are no mounts... maybe worth mentioning in a comment or in the
> > changelog ?
>
> If V9fsState will look sensible after migration if there are no mounts,
> I think it's worth adding a comment in the code.
Heh Michael just sent a pull request with the current version of the patch :)
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2015-11-12 16:06 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-10-22 17:38 [Qemu-devel] [PATCH] virtio-9p: add savem handlers Greg Kurz
2015-11-12 8:28 ` Greg Kurz
2015-11-12 12:50 ` Cornelia Huck
2015-11-12 14:25 ` Greg Kurz
2015-11-12 14:39 ` Cornelia Huck
2015-11-12 16:06 ` Greg Kurz
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