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.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
diff -r 34e519b679cf extras/mini-os/console/xencons_ring.c
--- a/extras/mini-os/console/xencons_ring.c Wed Jan 19 12:47:24 2011 +0000
+++ b/extras/mini-os/console/xencons_ring.c Wed Jan 19 12:48:05 2011 +0000
@@ -184,16 +184,43 @@ struct consfront_dev *xencons_ring_init(
void free_consfront(struct consfront_dev *dev)
{
+ char* err = NULL;
+ XenbusState state;
+
+ char path[strlen(dev->backend) + 1 + 5 + 1];
+ char nodename[strlen(dev->nodename) + 1 + 5 + 1];
+
+ snprintf(path, sizeof(path), "%s/state", dev->backend);
+ snprintf(nodename, sizeof(nodename), "%s/state", dev->nodename);
+
+ 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);
-
- unbind_evtchn(dev->evtchn);
-
- free(dev->nodename);
free(dev);
}
@@ -206,7 +233,7 @@ struct consfront_dev *init_consfront(cha
char* msg = NULL;
char nodename[256];
char path[256];
- static int consfrontends = 1;
+ static int consfrontends = 3;
struct consfront_dev *dev;
int res;
diff -r 34e519b679cf extras/mini-os/include/lib.h
--- a/extras/mini-os/include/lib.h Wed Jan 19 12:47:24 2011 +0000
+++ b/extras/mini-os/include/lib.h Wed Jan 19 12:48:05 2011 +0000
@@ -146,6 +146,7 @@ enum fd_type {
FTYPE_KBD,
FTYPE_FB,
FTYPE_MEM,
+ FTYPE_SAVEFILE,
};
#define MAX_EVTCHN_PORTS 16
diff -r 34e519b679cf extras/mini-os/lib/sys.c
--- a/extras/mini-os/lib/sys.c Wed Jan 19 12:47:24 2011 +0000
+++ b/extras/mini-os/lib/sys.c Wed Jan 19 12:48:05 2011 +0000
@@ -154,6 +154,9 @@ char *getcwd(char *buf, size_t size)
}
#define LOG_PATH "/var/log/"
+#define SAVE_PATH "/var/lib/xen"
+#define SAVE_CONSOLE 1
+#define RESTORE_CONSOLE 2
int mkdir(const char *pathname, mode_t mode)
{
@@ -175,6 +178,21 @@ int posix_openpt(int flags)
return(dev->fd);
}
+int open_savefile(char *path, int save)
+{
+ struct consfront_dev *dev;
+ char *nodename[64];
+
+ snprintf(nodename, sizeof(nodename), "device/console/%d", save ?
SAVE_CONSOLE : RESTORE_CONSOLE);
+
+ dev = init_consfront(nodename);
+ dev->fd = alloc_fd(FTYPE_SAVEFILE);
+ files[dev->fd].cons.dev = dev;
+
+ printk("fd(%d) = open_savefile\n", dev->fd);
+ return(dev->fd);
+}
+
int open(const char *pathname, int flags, ...)
{
int fd;
@@ -191,6 +209,8 @@ int open(const char *pathname, int flags
}
if (!strncmp(pathname, "/dev/ptmx", strlen("/dev/ptmx")))
return posix_openpt(flags);
+ if (!strncmp(pathname,SAVE_PATH,strlen(SAVE_PATH)))
+ return open_savefile(pathname, flags & O_WRONLY);
errno = EIO;
return -1;
}
@@ -203,6 +223,7 @@ int read(int fd, void *buf, size_t nbyte
int read(int fd, void *buf, size_t nbytes)
{
switch (files[fd].type) {
+ case FTYPE_SAVEFILE:
case FTYPE_CONSOLE: {
int ret;
DEFINE_WAIT(w);
@@ -260,6 +281,15 @@ int write(int fd, const void *buf, size_
int write(int fd, const void *buf, size_t nbytes)
{
switch (files[fd].type) {
+ case FTYPE_SAVEFILE: {
+ int ret = 0, tot = nbytes;
+ while (nbytes > 0) {
+ ret = xencons_ring_send(files[fd].cons.dev, (char *)buf,
nbytes);
+ nbytes -= ret;
+ buf += ret;
+ }
+ return tot - nbytes;
+ }
case FTYPE_CONSOLE:
console_print(files[fd].cons.dev, (char *)buf, nbytes);
return nbytes;
@@ -331,6 +361,7 @@ int close(int fd)
shutdown_fbfront(files[fd].fb.dev);
files[fd].type = FTYPE_NONE;
return 0;
+ case FTYPE_SAVEFILE:
case FTYPE_CONSOLE:
fini_console(files[fd].cons.dev);
files[fd].type = FTYPE_NONE;
@@ -364,9 +395,15 @@ int fstat(int fd, struct stat *buf)
{
init_stat(buf);
switch (files[fd].type) {
+ case FTYPE_SAVEFILE:
case FTYPE_CONSOLE:
case FTYPE_SOCKET: {
- buf->st_mode = (files[fd].type == FTYPE_CONSOLE?S_IFCHR:S_IFSOCK) |
S_IRUSR|S_IWUSR;
+ if (files[fd].type == FTYPE_CONSOLE)
+ buf->st_mode = S_IFCHR|S_IRUSR|S_IWUSR;
+ else if (files[fd].type == FTYPE_SOCKET)
+ buf->st_mode = S_IFSOCK|S_IRUSR|S_IWUSR;
+ else if (files[fd].type == FTYPE_SAVEFILE)
+ buf->st_mode = S_IFREG|S_IRUSR|S_IWUSR;
buf->st_uid = 0;
buf->st_gid = 0;
buf->st_size = 0;
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