diff options
Diffstat (limited to 'hw/xen/xen_pvdev.c')
| -rw-r--r-- | hw/xen/xen_pvdev.c | 316 |
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); +} |