root / hw / xen_backend.c @ 64d50b8b
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/*
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* xen backend driver infrastructure
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* (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* TODO: add some xenbus / xenstore concepts overview here.
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*/
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <stdarg.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <inttypes.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <sys/mman.h> |
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#include <sys/signal.h> |
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#include <xs.h> |
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#include <xenctrl.h> |
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#include <xen/grant_table.h> |
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#include "hw.h" |
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#include "qemu-char.h" |
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#include "qemu-log.h" |
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#include "xen_backend.h" |
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/* ------------------------------------------------------------- */
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/* public */
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int xen_xc;
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struct xs_handle *xenstore = NULL; |
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const char *xen_protocol; |
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/* private */
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static TAILQ_HEAD(XenDeviceHead, XenDevice) xendevs = TAILQ_HEAD_INITIALIZER(xendevs);
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static int debug = 0; |
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/* ------------------------------------------------------------- */
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int xenstore_write_str(const char *base, const char *node, const char *val) |
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{ |
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char abspath[XEN_BUFSIZE];
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snprintf(abspath, sizeof(abspath), "%s/%s", base, node); |
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if (!xs_write(xenstore, 0, abspath, val, strlen(val))) |
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return -1; |
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return 0; |
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} |
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char *xenstore_read_str(const char *base, const char *node) |
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{ |
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char abspath[XEN_BUFSIZE];
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unsigned int len; |
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char *str, *ret = NULL; |
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snprintf(abspath, sizeof(abspath), "%s/%s", base, node); |
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str = xs_read(xenstore, 0, abspath, &len);
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if (str != NULL) { |
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/* move to qemu-allocated memory to make sure
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* callers can savely qemu_free() stuff. */
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ret = qemu_strdup(str); |
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free(str); |
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} |
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return ret;
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} |
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int xenstore_write_int(const char *base, const char *node, int ival) |
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{ |
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char val[32]; |
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snprintf(val, sizeof(val), "%d", ival); |
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return xenstore_write_str(base, node, val);
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} |
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int xenstore_read_int(const char *base, const char *node, int *ival) |
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{ |
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char *val;
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int rc = -1; |
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val = xenstore_read_str(base, node); |
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if (val && 1 == sscanf(val, "%d", ival)) |
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rc = 0;
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qemu_free(val); |
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return rc;
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} |
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int xenstore_write_be_str(struct XenDevice *xendev, const char *node, const char *val) |
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{ |
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return xenstore_write_str(xendev->be, node, val);
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} |
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int xenstore_write_be_int(struct XenDevice *xendev, const char *node, int ival) |
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{ |
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return xenstore_write_int(xendev->be, node, ival);
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} |
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char *xenstore_read_be_str(struct XenDevice *xendev, const char *node) |
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{ |
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return xenstore_read_str(xendev->be, node);
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} |
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int xenstore_read_be_int(struct XenDevice *xendev, const char *node, int *ival) |
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{ |
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return xenstore_read_int(xendev->be, node, ival);
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} |
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char *xenstore_read_fe_str(struct XenDevice *xendev, const char *node) |
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{ |
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return xenstore_read_str(xendev->fe, node);
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} |
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int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival) |
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{ |
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return xenstore_read_int(xendev->fe, node, ival);
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} |
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/* ------------------------------------------------------------- */
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const char *xenbus_strstate(enum xenbus_state state) |
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{ |
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static const char *const name[] = { |
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[ XenbusStateUnknown ] = "Unknown",
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[ XenbusStateInitialising ] = "Initialising",
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[ XenbusStateInitWait ] = "InitWait",
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[ XenbusStateInitialised ] = "Initialised",
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[ XenbusStateConnected ] = "Connected",
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[ XenbusStateClosing ] = "Closing",
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[ XenbusStateClosed ] = "Closed",
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}; |
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return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID"; |
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} |
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int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state) |
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{ |
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int rc;
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rc = xenstore_write_be_int(xendev, "state", state);
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if (rc < 0) |
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return rc;
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xen_be_printf(xendev, 1, "backend state: %s -> %s\n", |
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xenbus_strstate(xendev->be_state), xenbus_strstate(state)); |
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xendev->be_state = state; |
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return 0; |
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} |
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/* ------------------------------------------------------------- */
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struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev) |
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{ |
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struct XenDevice *xendev;
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TAILQ_FOREACH(xendev, &xendevs, next) { |
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if (xendev->dom != dom)
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continue;
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if (xendev->dev != dev)
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continue;
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if (strcmp(xendev->type, type) != 0) |
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continue;
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return xendev;
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} |
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return NULL; |
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} |
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/*
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* get xen backend device, allocate a new one if it doesn't exist.
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*/
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static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, |
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struct XenDevOps *ops)
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{ |
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struct XenDevice *xendev;
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char *dom0;
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xendev = xen_be_find_xendev(type, dom, dev); |
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if (xendev)
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return xendev;
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/* init new xendev */
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xendev = qemu_mallocz(ops->size); |
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xendev->type = type; |
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xendev->dom = dom; |
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xendev->dev = dev; |
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xendev->ops = ops; |
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dom0 = xs_get_domain_path(xenstore, 0);
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snprintf(xendev->be, sizeof(xendev->be), "%s/backend/%s/%d/%d", |
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dom0, xendev->type, xendev->dom, xendev->dev); |
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snprintf(xendev->name, sizeof(xendev->name), "%s-%d", |
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xendev->type, xendev->dev); |
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free(dom0); |
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xendev->debug = debug; |
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xendev->local_port = -1;
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xendev->evtchndev = xc_evtchn_open(); |
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if (xendev->evtchndev < 0) { |
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xen_be_printf(NULL, 0, "can't open evtchn device\n"); |
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qemu_free(xendev); |
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return NULL; |
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} |
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fcntl(xc_evtchn_fd(xendev->evtchndev), F_SETFD, FD_CLOEXEC); |
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if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
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xendev->gnttabdev = xc_gnttab_open(); |
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if (xendev->gnttabdev < 0) { |
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xen_be_printf(NULL, 0, "can't open gnttab device\n"); |
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xc_evtchn_close(xendev->evtchndev); |
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qemu_free(xendev); |
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return NULL; |
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} |
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} else {
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xendev->gnttabdev = -1;
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} |
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TAILQ_INSERT_TAIL(&xendevs, xendev, next); |
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if (xendev->ops->alloc)
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xendev->ops->alloc(xendev); |
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return xendev;
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} |
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/*
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* release xen backend device.
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*/
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static struct XenDevice *xen_be_del_xendev(int dom, int dev) |
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{ |
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struct XenDevice *xendev, *xnext;
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/*
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* This is pretty much like TAILQ_FOREACH(xendev, &xendevs, next) but
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* we save the next pointer in xnext because we might free xendev.
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*/
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xnext = xendevs.tqh_first; |
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while (xnext) {
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xendev = xnext; |
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xnext = xendev->next.tqe_next; |
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if (xendev->dom != dom)
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continue;
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if (xendev->dev != dev && dev != -1) |
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continue;
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if (xendev->ops->free)
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xendev->ops->free(xendev); |
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if (xendev->fe) {
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char token[XEN_BUFSIZE];
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snprintf(token, sizeof(token), "fe:%p", xendev); |
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xs_unwatch(xenstore, xendev->fe, token); |
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qemu_free(xendev->fe); |
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} |
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if (xendev->evtchndev >= 0) |
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xc_evtchn_close(xendev->evtchndev); |
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if (xendev->gnttabdev >= 0) |
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xc_gnttab_close(xendev->gnttabdev); |
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TAILQ_REMOVE(&xendevs, xendev, next); |
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qemu_free(xendev); |
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} |
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return NULL; |
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} |
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/*
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* Sync internal data structures on xenstore updates.
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* Node specifies the changed field. node = NULL means
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* update all fields (used for initialization).
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*/
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static void xen_be_backend_changed(struct XenDevice *xendev, const char *node) |
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{ |
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if (node == NULL || strcmp(node, "online") == 0) { |
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if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) |
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xendev->online = 0;
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} |
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if (node) {
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xen_be_printf(xendev, 2, "backend update: %s\n", node); |
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if (xendev->ops->backend_changed)
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xendev->ops->backend_changed(xendev, node); |
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} |
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} |
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static void xen_be_frontend_changed(struct XenDevice *xendev, const char *node) |
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{ |
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int fe_state;
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if (node == NULL || strcmp(node, "state") == 0) { |
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if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) |
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fe_state = XenbusStateUnknown; |
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if (xendev->fe_state != fe_state)
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xen_be_printf(xendev, 1, "frontend state: %s -> %s\n", |
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xenbus_strstate(xendev->fe_state), |
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xenbus_strstate(fe_state)); |
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xendev->fe_state = fe_state; |
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} |
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if (node == NULL || strcmp(node, "protocol") == 0) { |
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qemu_free(xendev->protocol); |
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xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
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if (xendev->protocol)
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xen_be_printf(xendev, 1, "frontend protocol: %s\n", xendev->protocol); |
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} |
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if (node) {
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xen_be_printf(xendev, 2, "frontend update: %s\n", node); |
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if (xendev->ops->frontend_changed)
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xendev->ops->frontend_changed(xendev, node); |
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} |
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} |
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/* ------------------------------------------------------------- */
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/* Check for possible state transitions and perform them. */
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/*
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* Initial xendev setup. Read frontend path, register watch for it.
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* Should succeed once xend finished setting up the backend device.
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*
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* Also sets initial state (-> Initializing) when done. Which
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* only affects the xendev->be_state variable as xenbus should
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* already be put into that state by xend.
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*/
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static int xen_be_try_setup(struct XenDevice *xendev) |
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{ |
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char token[XEN_BUFSIZE];
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int be_state;
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if (xenstore_read_be_int(xendev, "state", &be_state) == -1) { |
344 |
xen_be_printf(xendev, 0, "reading backend state failed\n"); |
345 |
return -1; |
346 |
} |
347 |
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348 |
if (be_state != XenbusStateInitialising) {
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xen_be_printf(xendev, 0, "initial backend state is wrong (%s)\n", |
350 |
xenbus_strstate(be_state)); |
351 |
return -1; |
352 |
} |
353 |
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xendev->fe = xenstore_read_be_str(xendev, "frontend");
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355 |
if (xendev->fe == NULL) { |
356 |
xen_be_printf(xendev, 0, "reading frontend path failed\n"); |
357 |
return -1; |
358 |
} |
359 |
|
360 |
/* setup frontend watch */
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361 |
snprintf(token, sizeof(token), "fe:%p", xendev); |
362 |
if (!xs_watch(xenstore, xendev->fe, token)) {
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363 |
xen_be_printf(xendev, 0, "watching frontend path (%s) failed\n", |
364 |
xendev->fe); |
365 |
return -1; |
366 |
} |
367 |
xen_be_set_state(xendev, XenbusStateInitialising); |
368 |
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369 |
xen_be_backend_changed(xendev, NULL);
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370 |
xen_be_frontend_changed(xendev, NULL);
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return 0; |
372 |
} |
373 |
|
374 |
/*
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375 |
* Try initialize xendev. Prepare everything the backend can do
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376 |
* without synchronizing with the frontend. Fakes hotplug-status. No
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377 |
* hotplug involved here because this is about userspace drivers, thus
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* there are kernel backend devices which could invoke hotplug.
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379 |
*
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380 |
* Goes to InitWait on success.
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381 |
*/
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382 |
static int xen_be_try_init(struct XenDevice *xendev) |
383 |
{ |
384 |
int rc = 0; |
385 |
|
386 |
if (!xendev->online) {
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387 |
xen_be_printf(xendev, 1, "not online\n"); |
388 |
return -1; |
389 |
} |
390 |
|
391 |
if (xendev->ops->init)
|
392 |
rc = xendev->ops->init(xendev); |
393 |
if (rc != 0) { |
394 |
xen_be_printf(xendev, 1, "init() failed\n"); |
395 |
return rc;
|
396 |
} |
397 |
|
398 |
xenstore_write_be_str(xendev, "hotplug-status", "connected"); |
399 |
xen_be_set_state(xendev, XenbusStateInitWait); |
400 |
return 0; |
401 |
} |
402 |
|
403 |
/*
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404 |
* Try to connect xendev. Depends on the frontend being ready
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405 |
* for it (shared ring and evtchn info in xenstore, state being
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406 |
* Initialised or Connected).
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407 |
*
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408 |
* Goes to Connected on success.
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409 |
*/
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410 |
static int xen_be_try_connect(struct XenDevice *xendev) |
411 |
{ |
412 |
int rc = 0; |
413 |
|
414 |
if (xendev->fe_state != XenbusStateInitialised &&
|
415 |
xendev->fe_state != XenbusStateConnected) { |
416 |
if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
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417 |
xen_be_printf(xendev, 2, "frontend not ready, ignoring\n"); |
418 |
} else {
|
419 |
xen_be_printf(xendev, 2, "frontend not ready (yet)\n"); |
420 |
return -1; |
421 |
} |
422 |
} |
423 |
|
424 |
if (xendev->ops->connect)
|
425 |
rc = xendev->ops->connect(xendev); |
426 |
if (rc != 0) { |
427 |
xen_be_printf(xendev, 0, "connect() failed\n"); |
428 |
return rc;
|
429 |
} |
430 |
|
431 |
xen_be_set_state(xendev, XenbusStateConnected); |
432 |
return 0; |
433 |
} |
434 |
|
435 |
/*
|
436 |
* Teardown connection.
|
437 |
*
|
438 |
* Goes to Closed when done.
|
439 |
*/
|
440 |
static void xen_be_disconnect(struct XenDevice *xendev, enum xenbus_state state) |
441 |
{ |
442 |
if (xendev->be_state != XenbusStateClosing &&
|
443 |
xendev->be_state != XenbusStateClosed && |
444 |
xendev->ops->disconnect) |
445 |
xendev->ops->disconnect(xendev); |
446 |
if (xendev->be_state != state)
|
447 |
xen_be_set_state(xendev, state); |
448 |
} |
449 |
|
450 |
/*
|
451 |
* Try to reset xendev, for reconnection by another frontend instance.
|
452 |
*/
|
453 |
static int xen_be_try_reset(struct XenDevice *xendev) |
454 |
{ |
455 |
if (xendev->fe_state != XenbusStateInitialising)
|
456 |
return -1; |
457 |
|
458 |
xen_be_printf(xendev, 1, "device reset (for re-connect)\n"); |
459 |
xen_be_set_state(xendev, XenbusStateInitialising); |
460 |
return 0; |
461 |
} |
462 |
|
463 |
/*
|
464 |
* state change dispatcher function
|
465 |
*/
|
466 |
void xen_be_check_state(struct XenDevice *xendev) |
467 |
{ |
468 |
int rc = 0; |
469 |
|
470 |
/* frontend may request shutdown from almost anywhere */
|
471 |
if (xendev->fe_state == XenbusStateClosing ||
|
472 |
xendev->fe_state == XenbusStateClosed) { |
473 |
xen_be_disconnect(xendev, xendev->fe_state); |
474 |
return;
|
475 |
} |
476 |
|
477 |
/* check for possible backend state transitions */
|
478 |
for (;;) {
|
479 |
switch (xendev->be_state) {
|
480 |
case XenbusStateUnknown:
|
481 |
rc = xen_be_try_setup(xendev); |
482 |
break;
|
483 |
case XenbusStateInitialising:
|
484 |
rc = xen_be_try_init(xendev); |
485 |
break;
|
486 |
case XenbusStateInitWait:
|
487 |
rc = xen_be_try_connect(xendev); |
488 |
break;
|
489 |
case XenbusStateClosed:
|
490 |
rc = xen_be_try_reset(xendev); |
491 |
break;
|
492 |
default:
|
493 |
rc = -1;
|
494 |
} |
495 |
if (rc != 0) |
496 |
break;
|
497 |
} |
498 |
} |
499 |
|
500 |
/* ------------------------------------------------------------- */
|
501 |
|
502 |
static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops) |
503 |
{ |
504 |
struct XenDevice *xendev;
|
505 |
char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
|
506 |
char **dev = NULL, *dom0; |
507 |
unsigned int cdev, j; |
508 |
|
509 |
/* setup watch */
|
510 |
dom0 = xs_get_domain_path(xenstore, 0);
|
511 |
snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops); |
512 |
snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom); |
513 |
free(dom0); |
514 |
if (!xs_watch(xenstore, path, token)) {
|
515 |
xen_be_printf(NULL, 0, "xen be: watching backend path (%s) failed\n", path); |
516 |
return -1; |
517 |
} |
518 |
|
519 |
/* look for backends */
|
520 |
dev = xs_directory(xenstore, 0, path, &cdev);
|
521 |
if (!dev)
|
522 |
return 0; |
523 |
for (j = 0; j < cdev; j++) { |
524 |
xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops); |
525 |
if (xendev == NULL) |
526 |
continue;
|
527 |
xen_be_check_state(xendev); |
528 |
} |
529 |
free(dev); |
530 |
return 0; |
531 |
} |
532 |
|
533 |
static void xenstore_update_be(char *watch, char *type, int dom, |
534 |
struct XenDevOps *ops)
|
535 |
{ |
536 |
struct XenDevice *xendev;
|
537 |
char path[XEN_BUFSIZE], *dom0;
|
538 |
unsigned int len, dev; |
539 |
|
540 |
dom0 = xs_get_domain_path(xenstore, 0);
|
541 |
len = snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom); |
542 |
free(dom0); |
543 |
if (strncmp(path, watch, len) != 0) |
544 |
return;
|
545 |
if (sscanf(watch+len, "/%u/%255s", &dev, path) != 2) { |
546 |
strcpy(path, "");
|
547 |
if (sscanf(watch+len, "/%u", &dev) != 1) |
548 |
dev = -1;
|
549 |
} |
550 |
if (dev == -1) |
551 |
return;
|
552 |
|
553 |
if (0) { |
554 |
/* FIXME: detect devices being deleted from xenstore ... */
|
555 |
xen_be_del_xendev(dom, dev); |
556 |
} |
557 |
|
558 |
xendev = xen_be_get_xendev(type, dom, dev, ops); |
559 |
if (xendev != NULL) { |
560 |
xen_be_backend_changed(xendev, path); |
561 |
xen_be_check_state(xendev); |
562 |
} |
563 |
} |
564 |
|
565 |
static void xenstore_update_fe(char *watch, struct XenDevice *xendev) |
566 |
{ |
567 |
char *node;
|
568 |
unsigned int len; |
569 |
|
570 |
len = strlen(xendev->fe); |
571 |
if (strncmp(xendev->fe, watch, len) != 0) |
572 |
return;
|
573 |
if (watch[len] != '/') |
574 |
return;
|
575 |
node = watch + len + 1;
|
576 |
|
577 |
xen_be_frontend_changed(xendev, node); |
578 |
xen_be_check_state(xendev); |
579 |
} |
580 |
|
581 |
static void xenstore_update(void *unused) |
582 |
{ |
583 |
char **vec = NULL; |
584 |
intptr_t type, ops, ptr; |
585 |
unsigned int dom, count; |
586 |
|
587 |
vec = xs_read_watch(xenstore, &count); |
588 |
if (vec == NULL) |
589 |
goto cleanup;
|
590 |
|
591 |
if (sscanf(vec[XS_WATCH_TOKEN], "be:%" PRIxPTR ":%d:%" PRIxPTR, |
592 |
&type, &dom, &ops) == 3)
|
593 |
xenstore_update_be(vec[XS_WATCH_PATH], (void*)type, dom, (void*)ops); |
594 |
if (sscanf(vec[XS_WATCH_TOKEN], "fe:%" PRIxPTR, &ptr) == 1) |
595 |
xenstore_update_fe(vec[XS_WATCH_PATH], (void*)ptr);
|
596 |
|
597 |
cleanup:
|
598 |
qemu_free(vec); |
599 |
} |
600 |
|
601 |
static void xen_be_evtchn_event(void *opaque) |
602 |
{ |
603 |
struct XenDevice *xendev = opaque;
|
604 |
evtchn_port_t port; |
605 |
|
606 |
port = xc_evtchn_pending(xendev->evtchndev); |
607 |
if (port != xendev->local_port) {
|
608 |
xen_be_printf(xendev, 0, "xc_evtchn_pending returned %d (expected %d)\n", |
609 |
port, xendev->local_port); |
610 |
return;
|
611 |
} |
612 |
xc_evtchn_unmask(xendev->evtchndev, port); |
613 |
|
614 |
if (xendev->ops->event)
|
615 |
xendev->ops->event(xendev); |
616 |
} |
617 |
|
618 |
/* -------------------------------------------------------------------- */
|
619 |
|
620 |
int xen_be_init(void) |
621 |
{ |
622 |
xenstore = xs_daemon_open(); |
623 |
if (!xenstore) {
|
624 |
xen_be_printf(NULL, 0, "can't connect to xenstored\n"); |
625 |
return -1; |
626 |
} |
627 |
|
628 |
if (qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL) < 0) |
629 |
goto err;
|
630 |
|
631 |
xen_xc = xc_interface_open(); |
632 |
if (xen_xc == -1) { |
633 |
xen_be_printf(NULL, 0, "can't open xen interface\n"); |
634 |
goto err;
|
635 |
} |
636 |
return 0; |
637 |
|
638 |
err:
|
639 |
qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL); |
640 |
xs_daemon_close(xenstore); |
641 |
xenstore = NULL;
|
642 |
|
643 |
return -1; |
644 |
} |
645 |
|
646 |
int xen_be_register(const char *type, struct XenDevOps *ops) |
647 |
{ |
648 |
return xenstore_scan(type, xen_domid, ops);
|
649 |
} |
650 |
|
651 |
int xen_be_bind_evtchn(struct XenDevice *xendev) |
652 |
{ |
653 |
if (xendev->local_port != -1) |
654 |
return 0; |
655 |
xendev->local_port = xc_evtchn_bind_interdomain |
656 |
(xendev->evtchndev, xendev->dom, xendev->remote_port); |
657 |
if (xendev->local_port == -1) { |
658 |
xen_be_printf(xendev, 0, "xc_evtchn_bind_interdomain failed\n"); |
659 |
return -1; |
660 |
} |
661 |
xen_be_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port); |
662 |
qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev), |
663 |
xen_be_evtchn_event, NULL, xendev);
|
664 |
return 0; |
665 |
} |
666 |
|
667 |
void xen_be_unbind_evtchn(struct XenDevice *xendev) |
668 |
{ |
669 |
if (xendev->local_port == -1) |
670 |
return;
|
671 |
qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev), NULL, NULL, NULL); |
672 |
xc_evtchn_unbind(xendev->evtchndev, xendev->local_port); |
673 |
xen_be_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port); |
674 |
xendev->local_port = -1;
|
675 |
} |
676 |
|
677 |
int xen_be_send_notify(struct XenDevice *xendev) |
678 |
{ |
679 |
return xc_evtchn_notify(xendev->evtchndev, xendev->local_port);
|
680 |
} |
681 |
|
682 |
/*
|
683 |
* msg_level:
|
684 |
* 0 == errors (stderr + logfile).
|
685 |
* 1 == informative debug messages (logfile only).
|
686 |
* 2 == noisy debug messages (logfile only).
|
687 |
* 3 == will flood your log (logfile only).
|
688 |
*/
|
689 |
void xen_be_printf(struct XenDevice *xendev, int msg_level, const char *fmt, ...) |
690 |
{ |
691 |
va_list args; |
692 |
|
693 |
if (xendev) {
|
694 |
if (msg_level > xendev->debug)
|
695 |
return;
|
696 |
qemu_log("xen be: %s: ", xendev->name);
|
697 |
if (msg_level == 0) |
698 |
fprintf(stderr, "xen be: %s: ", xendev->name);
|
699 |
} else {
|
700 |
if (msg_level > debug)
|
701 |
return;
|
702 |
qemu_log("xen be core: ");
|
703 |
if (msg_level == 0) |
704 |
fprintf(stderr, "xen be core: ");
|
705 |
} |
706 |
va_start(args, fmt); |
707 |
qemu_log_vprintf(fmt, args); |
708 |
va_end(args); |
709 |
if (msg_level == 0) { |
710 |
va_start(args, fmt); |
711 |
vfprintf(stderr, fmt, args); |
712 |
va_end(args); |
713 |
} |
714 |
qemu_log_flush(); |
715 |
} |