This patch is straightforward and sends a virtio configuration interrupt to the guest when the window is resized. Unfortunately, there's a bug in the guest kernel function which handle this interrupt (config_work_handler) but a patch has been sent upstream ( https://lkml.org/lkml/2017/1/14/111 ). The guest kernel crashes on SIGWINCH if this kernel patch isn't applied. --- virtio/console.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/virtio/console.c b/virtio/console.c index f1c0a19..eb2aa3a 100644 --- a/virtio/console.c +++ b/virtio/console.c @@ -55,6 +55,7 @@ static struct con_dev cdev = { }; static int compat_id = -1; +static struct kvm *g_kvm; /* * Interrupts are injected for hvc0 only. @@ -126,16 +127,35 @@ static u8 *get_config(struct kvm *kvm, void *dev) static u32 get_host_features(struct kvm *kvm, void *dev) { + return 1UL << VIRTIO_CONSOLE_F_SIZE; +} + +static int update_console_size(void) +{ + struct virtio_console_config *conf = &cdev.config; + struct winsize sz; + + if (ioctl(STDIN_FILENO, TIOCGWINSZ, &sz) == -1) + return -1; + + conf->cols = virtio_host_to_guest_u16(&cdev->vdev, sz.ws_col); + conf->rows = virtio_host_to_guest_u16(&cdev->vdev, sz.ws_row); + return 0; } +static void window_resized(int signum) +{ + if (update_console_size() == 0) + cdev.vdev.ops->signal_config(g_kvm, &cdev.vdev); +} + static void set_guest_features(struct kvm *kvm, void *dev, u32 features) { struct con_dev *cdev = dev; struct virtio_console_config *conf = &cdev->config; - conf->cols = virtio_host_to_guest_u16(&cdev->vdev, conf->cols); - conf->rows = virtio_host_to_guest_u16(&cdev->vdev, conf->rows); + update_console_size(); conf->max_nr_ports = virtio_host_to_guest_u32(&cdev->vdev, conf->max_nr_ports); } @@ -221,6 +241,9 @@ int virtio_console__init(struct kvm *kvm) if (compat_id == -1) compat_id = virtio_compat_add_message("virtio-console", "CONFIG_VIRTIO_CONSOLE"); + g_kvm = kvm; + signal(SIGWINCH, window_resized); + return 0; } virtio_dev_init(virtio_console__init); -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
