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Tsirkin" , Juan Quintela , Richard Henderson , Markus Armbruster , Gautam Dawar , virtualization@lists.linux-foundation.org, Eduardo Habkost , Harpreet Singh Anand , Xiao W Wang , Peter Xu , Stefan Hajnoczi , Eli Cohen , Paolo Bonzini , Zhu Lingshan , Eric Blake , Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 在 2022/1/22 上午4:27, Eugenio Pérez 写道: > SVQ is able to log the dirty bits by itself, so let's use it to not > block migration. > > Also, ignore set and clear of VHOST_F_LOG_ALL on set_features if SVQ is > enabled. Even if the device supports it, the reports would be nonsense > because SVQ memory is in the qemu region. > > The log region is still allocated. Future changes might skip that, but > this series is already long enough. > > Signed-off-by: Eugenio Pérez > --- > hw/virtio/vhost-vdpa.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c > index fb0a338baa..75090d65e8 100644 > --- a/hw/virtio/vhost-vdpa.c > +++ b/hw/virtio/vhost-vdpa.c > @@ -1022,6 +1022,9 @@ static int vhost_vdpa_get_features(struct vhost_dev *dev, uint64_t *features) > if (ret == 0 && v->shadow_vqs_enabled) { > /* Filter only features that SVQ can offer to guest */ > vhost_svq_valid_guest_features(features); > + > + /* Add SVQ logging capabilities */ > + *features |= BIT_ULL(VHOST_F_LOG_ALL); > } > > return ret; > @@ -1039,8 +1042,25 @@ static int vhost_vdpa_set_features(struct vhost_dev *dev, > > if (v->shadow_vqs_enabled) { > uint64_t dev_features, svq_features, acked_features; > + uint8_t status = 0; > bool ok; > > + ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &status); > + if (unlikely(ret)) { > + return ret; > + } > + > + if (status & VIRTIO_CONFIG_S_DRIVER_OK) { > + /* > + * vhost is trying to enable or disable _F_LOG, and the device > + * would report wrong dirty pages. SVQ handles it. > + */ I fail to understand this comment, I'd think there's no way to disable dirty page tracking for SVQ. Thanks > + return 0; > + } > + > + /* We must not ack _F_LOG if SVQ is enabled */ > + features &= ~BIT_ULL(VHOST_F_LOG_ALL); > + > ret = vhost_vdpa_get_dev_features(dev, &dev_features); > if (ret != 0) { > error_report("Can't get vdpa device features, got (%d)", ret);