From 648429dc4066e47d190484921845871000be217d Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Fri, 21 Jan 2011 18:06:23 +0000 Subject: libxl, minios: stubdom console based save/restore Add two "special" PV consoles to stubdoms that are going to be used to send and receive the qemu-xen save files on save/restore. Use the second PV console to send the qemu-xen save file and the third PV console to receive the qemu-xen save file on restore. Fix the console shutdown function free_consfront that is called when the qemu save file is closed. Stubdom save/restore is still broken with xend. Signed-off-by: Stefano Stabellini Committed-by: Ian Jackson --- extras/mini-os/console/xencons_ring.c | 39 +++++++++++++++++++++++++++++------ 1 file changed, 33 insertions(+), 6 deletions(-) (limited to 'extras/mini-os/console') diff --git a/extras/mini-os/console/xencons_ring.c b/extras/mini-os/console/xencons_ring.c index bfe5cb663c..22fd6187bc 100644 --- a/extras/mini-os/console/xencons_ring.c +++ b/extras/mini-os/console/xencons_ring.c @@ -184,16 +184,43 @@ struct consfront_dev *xencons_ring_init(void) void free_consfront(struct consfront_dev *dev) { - mask_evtchn(dev->evtchn); + char* err = NULL; + XenbusState state; - free(dev->backend); + char path[strlen(dev->backend) + 1 + 5 + 1]; + char nodename[strlen(dev->nodename) + 1 + 5 + 1]; - gnttab_end_access(dev->ring_ref); - free_page(dev->ring); + snprintf(path, sizeof(path), "%s/state", dev->backend); + snprintf(nodename, sizeof(nodename), "%s/state", dev->nodename); - unbind_evtchn(dev->evtchn); + if ((err = xenbus_switch_state(XBT_NIL, nodename, XenbusStateClosing)) != NULL) { + printk("free_consfront: error changing state to %d: %s\n", + XenbusStateClosing, err); + goto close; + } + state = xenbus_read_integer(path); + while (err == NULL && state < XenbusStateClosing) + err = xenbus_wait_for_state_change(path, &state, &dev->events); + if (err) free(err); + + if ((err = xenbus_switch_state(XBT_NIL, nodename, XenbusStateClosed)) != NULL) { + printk("free_consfront: error changing state to %d: %s\n", + XenbusStateClosed, err); + goto close; + } +close: + if (err) free(err); + xenbus_unwatch_path_token(XBT_NIL, path, path); + + mask_evtchn(dev->evtchn); + unbind_evtchn(dev->evtchn); + free(dev->backend); free(dev->nodename); + + gnttab_end_access(dev->ring_ref); + + free_page(dev->ring); free(dev); } @@ -206,7 +233,7 @@ struct consfront_dev *init_consfront(char *_nodename) char* msg = NULL; char nodename[256]; char path[256]; - static int consfrontends = 1; + static int consfrontends = 3; struct consfront_dev *dev; int res; -- cgit v1.2.3