qemu/hw/xen/xen_pvdev.c

319 lines
7.8 KiB
C

/*
* 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 "qemu/log.h"
#include "hw/qdev-core.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);
qdev_unplug(&xendev->qdev, NULL);
}
void xen_pv_insert_xendev(struct XenDevice *xendev)
{
QTAILQ_INSERT_TAIL(&xendevs, xendev, next);
}