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Diffstat (limited to 'hw/xen/xen_pvdev.c')
-rw-r--r--hw/xen/xen_pvdev.c316
1 files changed, 316 insertions, 0 deletions
diff --git a/hw/xen/xen_pvdev.c b/hw/xen/xen_pvdev.c
new file mode 100644
index 0000000000..405e15484c
--- /dev/null
+++ b/hw/xen/xen_pvdev.c
@@ -0,0 +1,316 @@
+/*
+ * Xen para-virtualization device
+ *
+ * (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "qemu/osdep.h"
+
+#include "hw/xen/xen_backend.h"
+#include "hw/xen/xen_pvdev.h"
+
+/* private */
+static int debug;
+
+struct xs_dirs {
+ char *xs_dir;
+ QTAILQ_ENTRY(xs_dirs) list;
+};
+
+static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup =
+ QTAILQ_HEAD_INITIALIZER(xs_cleanup);
+
+static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs =
+ QTAILQ_HEAD_INITIALIZER(xendevs);
+
+/* ------------------------------------------------------------- */
+
+static void xenstore_cleanup_dir(char *dir)
+{
+ struct xs_dirs *d;
+
+ d = g_malloc(sizeof(*d));
+ d->xs_dir = dir;
+ QTAILQ_INSERT_TAIL(&xs_cleanup, d, list);
+}
+
+void xen_config_cleanup(void)
+{
+ struct xs_dirs *d;
+
+ QTAILQ_FOREACH(d, &xs_cleanup, list) {
+ xs_rm(xenstore, 0, d->xs_dir);
+ }
+}
+
+int xenstore_mkdir(char *path, int p)
+{
+ struct xs_permissions perms[2] = {
+ {
+ .id = 0, /* set owner: dom0 */
+ }, {
+ .id = xen_domid,
+ .perms = p,
+ }
+ };
+
+ if (!xs_mkdir(xenstore, 0, path)) {
+ xen_pv_printf(NULL, 0, "xs_mkdir %s: failed\n", path);
+ return -1;
+ }
+ xenstore_cleanup_dir(g_strdup(path));
+
+ if (!xs_set_permissions(xenstore, 0, path, perms, 2)) {
+ xen_pv_printf(NULL, 0, "xs_set_permissions %s: failed\n", path);
+ return -1;
+ }
+ return 0;
+}
+
+int xenstore_write_str(const char *base, const char *node, const char *val)
+{
+ char abspath[XEN_BUFSIZE];
+
+ snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
+ if (!xs_write(xenstore, 0, abspath, val, strlen(val))) {
+ return -1;
+ }
+ return 0;
+}
+
+char *xenstore_read_str(const char *base, const char *node)
+{
+ char abspath[XEN_BUFSIZE];
+ unsigned int len;
+ char *str, *ret = NULL;
+
+ snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
+ str = xs_read(xenstore, 0, abspath, &len);
+ if (str != NULL) {
+ /* move to qemu-allocated memory to make sure
+ * callers can savely g_free() stuff. */
+ ret = g_strdup(str);
+ free(str);
+ }
+ return ret;
+}
+
+int xenstore_write_int(const char *base, const char *node, int ival)
+{
+ char val[12];
+
+ snprintf(val, sizeof(val), "%d", ival);
+ return xenstore_write_str(base, node, val);
+}
+
+int xenstore_write_int64(const char *base, const char *node, int64_t ival)
+{
+ char val[21];
+
+ snprintf(val, sizeof(val), "%"PRId64, ival);
+ return xenstore_write_str(base, node, val);
+}
+
+int xenstore_read_int(const char *base, const char *node, int *ival)
+{
+ char *val;
+ int rc = -1;
+
+ val = xenstore_read_str(base, node);
+ if (val && 1 == sscanf(val, "%d", ival)) {
+ rc = 0;
+ }
+ g_free(val);
+ return rc;
+}
+
+int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval)
+{
+ char *val;
+ int rc = -1;
+
+ val = xenstore_read_str(base, node);
+ if (val && 1 == sscanf(val, "%"SCNu64, uval)) {
+ rc = 0;
+ }
+ g_free(val);
+ return rc;
+}
+
+void xenstore_update(void *unused)
+{
+ char **vec = NULL;
+ intptr_t type, ops, ptr;
+ unsigned int dom, count;
+
+ vec = xs_read_watch(xenstore, &count);
+ if (vec == NULL) {
+ goto cleanup;
+ }
+
+ if (sscanf(vec[XS_WATCH_TOKEN], "be:%" PRIxPTR ":%d:%" PRIxPTR,
+ &type, &dom, &ops) == 3) {
+ xenstore_update_be(vec[XS_WATCH_PATH], (void *)type, dom, (void*)ops);
+ }
+ if (sscanf(vec[XS_WATCH_TOKEN], "fe:%" PRIxPTR, &ptr) == 1) {
+ xenstore_update_fe(vec[XS_WATCH_PATH], (void *)ptr);
+ }
+
+cleanup:
+ free(vec);
+}
+
+const char *xenbus_strstate(enum xenbus_state state)
+{
+ static const char *const name[] = {
+ [XenbusStateUnknown] = "Unknown",
+ [XenbusStateInitialising] = "Initialising",
+ [XenbusStateInitWait] = "InitWait",
+ [XenbusStateInitialised] = "Initialised",
+ [XenbusStateConnected] = "Connected",
+ [XenbusStateClosing] = "Closing",
+ [XenbusStateClosed] = "Closed",
+ };
+ return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID";
+}
+
+/*
+ * msg_level:
+ * 0 == errors (stderr + logfile).
+ * 1 == informative debug messages (logfile only).
+ * 2 == noisy debug messages (logfile only).
+ * 3 == will flood your log (logfile only).
+ */
+void xen_pv_printf(struct XenDevice *xendev, int msg_level,
+ const char *fmt, ...)
+{
+ va_list args;
+
+ if (xendev) {
+ if (msg_level > xendev->debug) {
+ return;
+ }
+ qemu_log("xen be: %s: ", xendev->name);
+ if (msg_level == 0) {
+ fprintf(stderr, "xen be: %s: ", xendev->name);
+ }
+ } else {
+ if (msg_level > debug) {
+ return;
+ }
+ qemu_log("xen be core: ");
+ if (msg_level == 0) {
+ fprintf(stderr, "xen be core: ");
+ }
+ }
+ va_start(args, fmt);
+ qemu_log_vprintf(fmt, args);
+ va_end(args);
+ if (msg_level == 0) {
+ va_start(args, fmt);
+ vfprintf(stderr, fmt, args);
+ va_end(args);
+ }
+ qemu_log_flush();
+}
+
+void xen_pv_evtchn_event(void *opaque)
+{
+ struct XenDevice *xendev = opaque;
+ evtchn_port_t port;
+
+ port = xenevtchn_pending(xendev->evtchndev);
+ if (port != xendev->local_port) {
+ xen_pv_printf(xendev, 0,
+ "xenevtchn_pending returned %d (expected %d)\n",
+ port, xendev->local_port);
+ return;
+ }
+ xenevtchn_unmask(xendev->evtchndev, port);
+
+ if (xendev->ops->event) {
+ xendev->ops->event(xendev);
+ }
+}
+
+void xen_pv_unbind_evtchn(struct XenDevice *xendev)
+{
+ if (xendev->local_port == -1) {
+ return;
+ }
+ qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev), NULL, NULL, NULL);
+ xenevtchn_unbind(xendev->evtchndev, xendev->local_port);
+ xen_pv_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port);
+ xendev->local_port = -1;
+}
+
+int xen_pv_send_notify(struct XenDevice *xendev)
+{
+ return xenevtchn_notify(xendev->evtchndev, xendev->local_port);
+}
+
+/* ------------------------------------------------------------- */
+
+struct XenDevice *xen_pv_find_xendev(const char *type, int dom, int dev)
+{
+ struct XenDevice *xendev;
+
+ QTAILQ_FOREACH(xendev, &xendevs, next) {
+ if (xendev->dom != dom) {
+ continue;
+ }
+ if (xendev->dev != dev) {
+ continue;
+ }
+ if (strcmp(xendev->type, type) != 0) {
+ continue;
+ }
+ return xendev;
+ }
+ return NULL;
+}
+
+/*
+ * release xen backend device.
+ */
+void xen_pv_del_xendev(struct XenDevice *xendev)
+{
+ if (xendev->ops->free) {
+ xendev->ops->free(xendev);
+ }
+
+ if (xendev->fe) {
+ char token[XEN_BUFSIZE];
+ snprintf(token, sizeof(token), "fe:%p", xendev);
+ xs_unwatch(xenstore, xendev->fe, token);
+ g_free(xendev->fe);
+ }
+
+ if (xendev->evtchndev != NULL) {
+ xenevtchn_close(xendev->evtchndev);
+ }
+ if (xendev->gnttabdev != NULL) {
+ xengnttab_close(xendev->gnttabdev);
+ }
+
+ QTAILQ_REMOVE(&xendevs, xendev, next);
+ g_free(xendev);
+}
+
+void xen_pv_insert_xendev(struct XenDevice *xendev)
+{
+ QTAILQ_INSERT_TAIL(&xendevs, xendev, next);
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-05 03:20:47 +0000