* [Qemu-devel] [PATCH] virtio-migration: Migrate config vector for virtio devices
@ 2015-06-03 15:04 Jason J. Herne
2015-06-03 15:42 ` Christian Borntraeger
2015-06-03 15:44 ` Michael S. Tsirkin
0 siblings, 2 replies; 4+ messages in thread
From: Jason J. Herne @ 2015-06-03 15:04 UTC (permalink / raw)
To: dahi, amit.shah, dgilbert, borntraeger, quintela, qemu-devel,
cornelia.huck, mst, pbonzini
Cc: Jason J. Herne
virtio_ccw_{save|load}_config are missing code to save and restore a vdev's
config_vector value. This causes some virtio devices to become disabled
following a migration.
This patch fixes a bug whereby the qmp/hmp balloon command (virsh setmem)
silently fails to update the guest's available memory because the device was not
properly migrated.
Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
---
hw/s390x/virtio-ccw.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index ef90fed..05eaee2 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1310,6 +1310,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
{
VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
SubchDev *s = dev->sch;
+ VirtIODevice *vdev = virtio_ccw_get_vdev(s);
subch_device_save(s, f);
if (dev->indicators != NULL) {
@@ -1333,6 +1334,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
qemu_put_be32(f, 0);
qemu_put_be64(f, 0UL);
}
+ qemu_put_be16(f, vdev->config_vector);
qemu_put_be64(f, dev->routes.adapter.ind_offset);
qemu_put_byte(f, dev->thinint_isc);
}
@@ -1341,6 +1343,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
{
VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
SubchDev *s = dev->sch;
+ VirtIODevice *vdev = virtio_ccw_get_vdev(s);
int len;
s->driver_data = dev;
@@ -1366,6 +1369,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
qemu_get_be64(f);
dev->summary_indicator = NULL;
}
+ qemu_get_be16s(f, &vdev->config_vector);
dev->routes.adapter.ind_offset = qemu_get_be64(f);
dev->thinint_isc = qemu_get_byte(f);
if (s->thinint_active) {
--
1.9.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] [PATCH] virtio-migration: Migrate config vector for virtio devices
2015-06-03 15:04 [Qemu-devel] [PATCH] virtio-migration: Migrate config vector for virtio devices Jason J. Herne
@ 2015-06-03 15:42 ` Christian Borntraeger
2015-06-03 15:44 ` Michael S. Tsirkin
2015-06-03 15:44 ` Michael S. Tsirkin
1 sibling, 1 reply; 4+ messages in thread
From: Christian Borntraeger @ 2015-06-03 15:42 UTC (permalink / raw)
To: Jason J. Herne, dahi, amit.shah, dgilbert, quintela, qemu-devel,
cornelia.huck, mst, pbonzini
Am 03.06.2015 um 17:04 schrieb Jason J. Herne:
> virtio_ccw_{save|load}_config are missing code to save and restore a vdev's
> config_vector value. This causes some virtio devices to become disabled
> following a migration.
>
> This patch fixes a bug whereby the qmp/hmp balloon command (virsh setmem)
> silently fails to update the guest's available memory because the device was not
> properly migrated.
>
> Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Will apply to my s390 branch with a slightly modified subject (virtio-ccw/migration:)
and will add some explanation about how the machine cpu state version change between
v2.3 and v2.4 will protect us.
Thanks.
> ---
> hw/s390x/virtio-ccw.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> index ef90fed..05eaee2 100644
> --- a/hw/s390x/virtio-ccw.c
> +++ b/hw/s390x/virtio-ccw.c
> @@ -1310,6 +1310,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
> {
> VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
> SubchDev *s = dev->sch;
> + VirtIODevice *vdev = virtio_ccw_get_vdev(s);
>
> subch_device_save(s, f);
> if (dev->indicators != NULL) {
> @@ -1333,6 +1334,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
> qemu_put_be32(f, 0);
> qemu_put_be64(f, 0UL);
> }
> + qemu_put_be16(f, vdev->config_vector);
> qemu_put_be64(f, dev->routes.adapter.ind_offset);
> qemu_put_byte(f, dev->thinint_isc);
> }
> @@ -1341,6 +1343,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
> {
> VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
> SubchDev *s = dev->sch;
> + VirtIODevice *vdev = virtio_ccw_get_vdev(s);
> int len;
>
> s->driver_data = dev;
> @@ -1366,6 +1369,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
> qemu_get_be64(f);
> dev->summary_indicator = NULL;
> }
> + qemu_get_be16s(f, &vdev->config_vector);
> dev->routes.adapter.ind_offset = qemu_get_be64(f);
> dev->thinint_isc = qemu_get_byte(f);
> if (s->thinint_active) {
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] [PATCH] virtio-migration: Migrate config vector for virtio devices
2015-06-03 15:04 [Qemu-devel] [PATCH] virtio-migration: Migrate config vector for virtio devices Jason J. Herne
2015-06-03 15:42 ` Christian Borntraeger
@ 2015-06-03 15:44 ` Michael S. Tsirkin
1 sibling, 0 replies; 4+ messages in thread
From: Michael S. Tsirkin @ 2015-06-03 15:44 UTC (permalink / raw)
To: Jason J. Herne
Cc: cornelia.huck, quintela, qemu-devel, dgilbert, dahi, amit.shah,
pbonzini, borntraeger
On Wed, Jun 03, 2015 at 11:04:03AM -0400, Jason J. Herne wrote:
> virtio_ccw_{save|load}_config are missing code to save and restore a vdev's
> config_vector value. This causes some virtio devices to become disabled
> following a migration.
>
> This patch fixes a bug whereby the qmp/hmp balloon command (virsh setmem)
> silently fails to update the guest's available memory because the device was not
> properly migrated.
>
> Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> hw/s390x/virtio-ccw.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> index ef90fed..05eaee2 100644
> --- a/hw/s390x/virtio-ccw.c
> +++ b/hw/s390x/virtio-ccw.c
> @@ -1310,6 +1310,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
> {
> VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
> SubchDev *s = dev->sch;
> + VirtIODevice *vdev = virtio_ccw_get_vdev(s);
>
> subch_device_save(s, f);
> if (dev->indicators != NULL) {
> @@ -1333,6 +1334,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
> qemu_put_be32(f, 0);
> qemu_put_be64(f, 0UL);
> }
> + qemu_put_be16(f, vdev->config_vector);
> qemu_put_be64(f, dev->routes.adapter.ind_offset);
> qemu_put_byte(f, dev->thinint_isc);
> }
> @@ -1341,6 +1343,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
> {
> VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
> SubchDev *s = dev->sch;
> + VirtIODevice *vdev = virtio_ccw_get_vdev(s);
> int len;
>
> s->driver_data = dev;
> @@ -1366,6 +1369,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
> qemu_get_be64(f);
> dev->summary_indicator = NULL;
> }
> + qemu_get_be16s(f, &vdev->config_vector);
> dev->routes.adapter.ind_offset = qemu_get_be64(f);
> dev->thinint_isc = qemu_get_byte(f);
> if (s->thinint_active) {
> --
> 1.9.1
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] [PATCH] virtio-migration: Migrate config vector for virtio devices
2015-06-03 15:42 ` Christian Borntraeger
@ 2015-06-03 15:44 ` Michael S. Tsirkin
0 siblings, 0 replies; 4+ messages in thread
From: Michael S. Tsirkin @ 2015-06-03 15:44 UTC (permalink / raw)
To: Christian Borntraeger
Cc: cornelia.huck, quintela, qemu-devel, dgilbert, dahi,
Jason J. Herne, amit.shah, pbonzini
On Wed, Jun 03, 2015 at 05:42:17PM +0200, Christian Borntraeger wrote:
> Am 03.06.2015 um 17:04 schrieb Jason J. Herne:
> > virtio_ccw_{save|load}_config are missing code to save and restore a vdev's
> > config_vector value. This causes some virtio devices to become disabled
> > following a migration.
> >
> > This patch fixes a bug whereby the qmp/hmp balloon command (virsh setmem)
> > silently fails to update the guest's available memory because the device was not
> > properly migrated.
> >
> > Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
>
> Will apply to my s390 branch with a slightly modified subject (virtio-ccw/migration:)
> and will add some explanation about how the machine cpu state version change between
> v2.3 and v2.4 will protect us.
>
> Thanks.
OK I queued this but I can back it out. Sent a review tag.
> > ---
> > hw/s390x/virtio-ccw.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
> > index ef90fed..05eaee2 100644
> > --- a/hw/s390x/virtio-ccw.c
> > +++ b/hw/s390x/virtio-ccw.c
> > @@ -1310,6 +1310,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
> > {
> > VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
> > SubchDev *s = dev->sch;
> > + VirtIODevice *vdev = virtio_ccw_get_vdev(s);
> >
> > subch_device_save(s, f);
> > if (dev->indicators != NULL) {
> > @@ -1333,6 +1334,7 @@ static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
> > qemu_put_be32(f, 0);
> > qemu_put_be64(f, 0UL);
> > }
> > + qemu_put_be16(f, vdev->config_vector);
> > qemu_put_be64(f, dev->routes.adapter.ind_offset);
> > qemu_put_byte(f, dev->thinint_isc);
> > }
> > @@ -1341,6 +1343,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
> > {
> > VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
> > SubchDev *s = dev->sch;
> > + VirtIODevice *vdev = virtio_ccw_get_vdev(s);
> > int len;
> >
> > s->driver_data = dev;
> > @@ -1366,6 +1369,7 @@ static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
> > qemu_get_be64(f);
> > dev->summary_indicator = NULL;
> > }
> > + qemu_get_be16s(f, &vdev->config_vector);
> > dev->routes.adapter.ind_offset = qemu_get_be64(f);
> > dev->thinint_isc = qemu_get_byte(f);
> > if (s->thinint_active) {
> >
^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-06-03 15:04 [Qemu-devel] [PATCH] virtio-migration: Migrate config vector for virtio devices Jason J. Herne
2015-06-03 15:42 ` Christian Borntraeger
2015-06-03 15:44 ` Michael S. Tsirkin
2015-06-03 15:44 ` Michael S. Tsirkin
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