There's no need to make the machine allow every possible sysbus device. We can now just add xen-sysdev to the allowed list. Cc: Stefano Stabellini <sstabellini@kernel.org> Cc: Anthony Perard <anthony.perard@citrix.com> Cc: xen-devel@lists.xenproject.org Cc: Juergen Gross <jgross@suse.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <20171125151610.20547-6-ehabkost@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
694 lines
19 KiB
C
694 lines
19 KiB
C
/*
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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, see <http://www.gnu.org/licenses/>.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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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 "qemu/osdep.h"
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#include <sys/signal.h>
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#include "hw/hw.h"
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#include "hw/sysbus.h"
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#include "hw/boards.h"
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#include "qemu/log.h"
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#include "qapi/error.h"
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#include "hw/xen/xen_backend.h"
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#include "hw/xen/xen_pvdev.h"
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#include "monitor/qdev.h"
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#include <xen/grant_table.h>
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DeviceState *xen_sysdev;
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BusState *xen_sysbus;
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/* ------------------------------------------------------------- */
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/* public */
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struct xs_handle *xenstore = NULL;
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const char *xen_protocol;
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bool xen_feature_grant_copy;
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/* private */
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static int debug;
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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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int xenstore_write_be_int64(struct XenDevice *xendev, const char *node, int64_t ival)
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{
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return xenstore_write_int64(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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int xenstore_read_fe_uint64(struct XenDevice *xendev, const char *node,
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uint64_t *uval)
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{
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return xenstore_read_uint64(xendev->fe, node, uval);
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}
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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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}
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xen_pv_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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* 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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xendev = xen_pv_find_xendev(type, dom, dev);
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if (xendev) {
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return xendev;
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}
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/* init new xendev */
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xendev = g_malloc0(ops->size);
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object_initialize(&xendev->qdev, ops->size, TYPE_XENBACKEND);
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OBJECT(xendev)->free = g_free;
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qdev_set_parent_bus(DEVICE(xendev), xen_sysbus);
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qdev_set_id(DEVICE(xendev), g_strdup_printf("xen-%s-%d", type, dev));
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qdev_init_nofail(DEVICE(xendev));
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object_unref(OBJECT(xendev));
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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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snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d",
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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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xendev->debug = debug;
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xendev->local_port = -1;
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xendev->evtchndev = xenevtchn_open(NULL, 0);
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if (xendev->evtchndev == NULL) {
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xen_pv_printf(NULL, 0, "can't open evtchn device\n");
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qdev_unplug(DEVICE(xendev), NULL);
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return NULL;
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}
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qemu_set_cloexec(xenevtchn_fd(xendev->evtchndev));
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if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
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xendev->gnttabdev = xengnttab_open(NULL, 0);
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if (xendev->gnttabdev == NULL) {
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xen_pv_printf(NULL, 0, "can't open gnttab device\n");
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xenevtchn_close(xendev->evtchndev);
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qdev_unplug(DEVICE(xendev), NULL);
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return NULL;
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}
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} else {
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xendev->gnttabdev = NULL;
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}
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xen_pv_insert_xendev(xendev);
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if (xendev->ops->alloc) {
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xendev->ops->alloc(xendev);
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}
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return xendev;
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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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}
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if (node) {
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xen_pv_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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}
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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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}
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if (xendev->fe_state != fe_state) {
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xen_pv_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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}
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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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g_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_pv_printf(xendev, 1, "frontend protocol: %s\n",
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xendev->protocol);
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}
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}
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if (node) {
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xen_pv_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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/* ------------------------------------------------------------- */
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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) {
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xen_pv_printf(xendev, 0, "reading backend state failed\n");
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return -1;
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}
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if (be_state != XenbusStateInitialising) {
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xen_pv_printf(xendev, 0, "initial backend state is wrong (%s)\n",
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xenbus_strstate(be_state));
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return -1;
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}
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xendev->fe = xenstore_read_be_str(xendev, "frontend");
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if (xendev->fe == NULL) {
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xen_pv_printf(xendev, 0, "reading frontend path failed\n");
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return -1;
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}
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/* setup frontend watch */
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snprintf(token, sizeof(token), "fe:%p", xendev);
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if (!xs_watch(xenstore, xendev->fe, token)) {
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xen_pv_printf(xendev, 0, "watching frontend path (%s) failed\n",
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xendev->fe);
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return -1;
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}
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xen_be_set_state(xendev, XenbusStateInitialising);
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xen_be_backend_changed(xendev, NULL);
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xen_be_frontend_changed(xendev, NULL);
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return 0;
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}
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/*
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* Try initialize xendev. Prepare everything the backend can do
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* without synchronizing with the frontend. Fakes hotplug-status. No
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* 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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*
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* Goes to InitWait on success.
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*/
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static int xen_be_try_init(struct XenDevice *xendev)
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{
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int rc = 0;
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if (!xendev->online) {
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xen_pv_printf(xendev, 1, "not online\n");
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return -1;
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}
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if (xendev->ops->init) {
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rc = xendev->ops->init(xendev);
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}
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if (rc != 0) {
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xen_pv_printf(xendev, 1, "init() failed\n");
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return rc;
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}
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xenstore_write_be_str(xendev, "hotplug-status", "connected");
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xen_be_set_state(xendev, XenbusStateInitWait);
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return 0;
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}
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/*
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* Try to initialise xendev. Depends on the frontend being ready
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* for it (shared ring and evtchn info in xenstore, state being
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* Initialised or Connected).
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*
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* Goes to Connected on success.
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*/
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static int xen_be_try_initialise(struct XenDevice *xendev)
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{
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int rc = 0;
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if (xendev->fe_state != XenbusStateInitialised &&
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xendev->fe_state != XenbusStateConnected) {
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if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
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xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
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} else {
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xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
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return -1;
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}
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}
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if (xendev->ops->initialise) {
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rc = xendev->ops->initialise(xendev);
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}
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if (rc != 0) {
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xen_pv_printf(xendev, 0, "initialise() failed\n");
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return rc;
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}
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xen_be_set_state(xendev, XenbusStateConnected);
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return 0;
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}
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/*
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* Try to let xendev know that it is connected. Depends on the
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* frontend being Connected. Note that this may be called more
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* than once since the backend state is not modified.
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*/
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static void xen_be_try_connected(struct XenDevice *xendev)
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{
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if (!xendev->ops->connected) {
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return;
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}
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if (xendev->fe_state != XenbusStateConnected) {
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if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
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xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
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} else {
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xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
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return;
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}
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}
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xendev->ops->connected(xendev);
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}
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/*
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* Teardown connection.
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*
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* Goes to Closed when done.
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*/
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static void xen_be_disconnect(struct XenDevice *xendev, enum xenbus_state state)
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{
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if (xendev->be_state != XenbusStateClosing &&
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xendev->be_state != XenbusStateClosed &&
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xendev->ops->disconnect) {
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xendev->ops->disconnect(xendev);
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}
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if (xendev->be_state != state) {
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xen_be_set_state(xendev, state);
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}
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}
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/*
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* Try to reset xendev, for reconnection by another frontend instance.
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*/
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static int xen_be_try_reset(struct XenDevice *xendev)
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{
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if (xendev->fe_state != XenbusStateInitialising) {
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return -1;
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}
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xen_pv_printf(xendev, 1, "device reset (for re-connect)\n");
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xen_be_set_state(xendev, XenbusStateInitialising);
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return 0;
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}
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/*
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* state change dispatcher function
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*/
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void xen_be_check_state(struct XenDevice *xendev)
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{
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int rc = 0;
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/* frontend may request shutdown from almost anywhere */
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if (xendev->fe_state == XenbusStateClosing ||
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xendev->fe_state == XenbusStateClosed) {
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xen_be_disconnect(xendev, xendev->fe_state);
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return;
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}
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/* check for possible backend state transitions */
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for (;;) {
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switch (xendev->be_state) {
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case XenbusStateUnknown:
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rc = xen_be_try_setup(xendev);
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break;
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case XenbusStateInitialising:
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rc = xen_be_try_init(xendev);
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break;
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case XenbusStateInitWait:
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rc = xen_be_try_initialise(xendev);
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break;
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case XenbusStateConnected:
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/* xendev->be_state doesn't change */
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xen_be_try_connected(xendev);
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rc = -1;
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break;
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case XenbusStateClosed:
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rc = xen_be_try_reset(xendev);
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break;
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default:
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rc = -1;
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}
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if (rc != 0) {
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break;
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}
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}
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}
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/* ------------------------------------------------------------- */
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static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
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{
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struct XenDevice *xendev;
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char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
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char **dev = NULL;
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unsigned int cdev, j;
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/* setup watch */
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snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops);
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snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
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if (!xs_watch(xenstore, path, token)) {
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xen_pv_printf(NULL, 0, "xen be: watching backend path (%s) failed\n",
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path);
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return -1;
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}
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/* look for backends */
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dev = xs_directory(xenstore, 0, path, &cdev);
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if (!dev) {
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return 0;
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}
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for (j = 0; j < cdev; j++) {
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xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops);
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if (xendev == NULL) {
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continue;
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}
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xen_be_check_state(xendev);
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}
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free(dev);
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return 0;
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}
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void xenstore_update_be(char *watch, char *type, int dom,
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struct XenDevOps *ops)
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{
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struct XenDevice *xendev;
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char path[XEN_BUFSIZE], *bepath;
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unsigned int len, dev;
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len = snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
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if (strncmp(path, watch, len) != 0) {
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return;
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}
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if (sscanf(watch+len, "/%u/%255s", &dev, path) != 2) {
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strcpy(path, "");
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if (sscanf(watch+len, "/%u", &dev) != 1) {
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dev = -1;
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}
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}
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if (dev == -1) {
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return;
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}
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xendev = xen_be_get_xendev(type, dom, dev, ops);
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if (xendev != NULL) {
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bepath = xs_read(xenstore, 0, xendev->be, &len);
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if (bepath == NULL) {
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xen_pv_del_xendev(xendev);
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} else {
|
|
free(bepath);
|
|
xen_be_backend_changed(xendev, path);
|
|
xen_be_check_state(xendev);
|
|
}
|
|
}
|
|
}
|
|
|
|
void xenstore_update_fe(char *watch, struct XenDevice *xendev)
|
|
{
|
|
char *node;
|
|
unsigned int len;
|
|
|
|
len = strlen(xendev->fe);
|
|
if (strncmp(xendev->fe, watch, len) != 0) {
|
|
return;
|
|
}
|
|
if (watch[len] != '/') {
|
|
return;
|
|
}
|
|
node = watch + len + 1;
|
|
|
|
xen_be_frontend_changed(xendev, node);
|
|
xen_be_check_state(xendev);
|
|
}
|
|
/* -------------------------------------------------------------------- */
|
|
|
|
int xen_be_init(void)
|
|
{
|
|
xengnttab_handle *gnttabdev;
|
|
|
|
xenstore = xs_daemon_open();
|
|
if (!xenstore) {
|
|
xen_pv_printf(NULL, 0, "can't connect to xenstored\n");
|
|
return -1;
|
|
}
|
|
|
|
qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL);
|
|
|
|
if (xen_xc == NULL || xen_fmem == NULL) {
|
|
/* Check if xen_init() have been called */
|
|
goto err;
|
|
}
|
|
|
|
gnttabdev = xengnttab_open(NULL, 0);
|
|
if (gnttabdev != NULL) {
|
|
if (xengnttab_grant_copy(gnttabdev, 0, NULL) == 0) {
|
|
xen_feature_grant_copy = true;
|
|
}
|
|
xengnttab_close(gnttabdev);
|
|
}
|
|
|
|
xen_sysdev = qdev_create(NULL, TYPE_XENSYSDEV);
|
|
qdev_init_nofail(xen_sysdev);
|
|
xen_sysbus = qbus_create(TYPE_XENSYSBUS, DEVICE(xen_sysdev), "xen-sysbus");
|
|
qbus_set_bus_hotplug_handler(xen_sysbus, &error_abort);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL);
|
|
xs_daemon_close(xenstore);
|
|
xenstore = NULL;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static void xen_set_dynamic_sysbus(void)
|
|
{
|
|
Object *machine = qdev_get_machine();
|
|
ObjectClass *oc = object_get_class(machine);
|
|
MachineClass *mc = MACHINE_CLASS(oc);
|
|
|
|
machine_class_allow_dynamic_sysbus_dev(mc, TYPE_XENSYSDEV);
|
|
}
|
|
|
|
int xen_be_register(const char *type, struct XenDevOps *ops)
|
|
{
|
|
char path[50];
|
|
int rc;
|
|
|
|
if (ops->backend_register) {
|
|
rc = ops->backend_register();
|
|
if (rc) {
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
snprintf(path, sizeof(path), "device-model/%u/backends/%s", xen_domid,
|
|
type);
|
|
xenstore_mkdir(path, XS_PERM_NONE);
|
|
|
|
return xenstore_scan(type, xen_domid, ops);
|
|
}
|
|
|
|
void xen_be_register_common(void)
|
|
{
|
|
xen_set_dynamic_sysbus();
|
|
|
|
xen_be_register("console", &xen_console_ops);
|
|
xen_be_register("vkbd", &xen_kbdmouse_ops);
|
|
xen_be_register("qdisk", &xen_blkdev_ops);
|
|
#ifdef CONFIG_VIRTFS
|
|
xen_be_register("9pfs", &xen_9pfs_ops);
|
|
#endif
|
|
#ifdef CONFIG_USB_LIBUSB
|
|
xen_be_register("qusb", &xen_usb_ops);
|
|
#endif
|
|
}
|
|
|
|
int xen_be_bind_evtchn(struct XenDevice *xendev)
|
|
{
|
|
if (xendev->local_port != -1) {
|
|
return 0;
|
|
}
|
|
xendev->local_port = xenevtchn_bind_interdomain
|
|
(xendev->evtchndev, xendev->dom, xendev->remote_port);
|
|
if (xendev->local_port == -1) {
|
|
xen_pv_printf(xendev, 0, "xenevtchn_bind_interdomain failed\n");
|
|
return -1;
|
|
}
|
|
xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
|
|
qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev),
|
|
xen_pv_evtchn_event, NULL, xendev);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static Property xendev_properties[] = {
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void xendev_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
dc->props = xendev_properties;
|
|
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
|
|
/* xen-backend devices can be plugged/unplugged dynamically */
|
|
dc->user_creatable = true;
|
|
}
|
|
|
|
static const TypeInfo xendev_type_info = {
|
|
.name = TYPE_XENBACKEND,
|
|
.parent = TYPE_XENSYSDEV,
|
|
.class_init = xendev_class_init,
|
|
.instance_size = sizeof(struct XenDevice),
|
|
};
|
|
|
|
static void xen_sysbus_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
|
|
|
|
hc->unplug = qdev_simple_device_unplug_cb;
|
|
}
|
|
|
|
static const TypeInfo xensysbus_info = {
|
|
.name = TYPE_XENSYSBUS,
|
|
.parent = TYPE_BUS,
|
|
.class_init = xen_sysbus_class_init,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_HOTPLUG_HANDLER },
|
|
{ }
|
|
}
|
|
};
|
|
|
|
static int xen_sysdev_init(SysBusDevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static Property xen_sysdev_properties[] = {
|
|
{/* end of property list */},
|
|
};
|
|
|
|
static void xen_sysdev_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
|
|
|
|
k->init = xen_sysdev_init;
|
|
dc->props = xen_sysdev_properties;
|
|
dc->bus_type = TYPE_XENSYSBUS;
|
|
}
|
|
|
|
static const TypeInfo xensysdev_info = {
|
|
.name = TYPE_XENSYSDEV,
|
|
.parent = TYPE_SYS_BUS_DEVICE,
|
|
.instance_size = sizeof(SysBusDevice),
|
|
.class_init = xen_sysdev_class_init,
|
|
};
|
|
|
|
static void xenbe_register_types(void)
|
|
{
|
|
type_register_static(&xensysbus_info);
|
|
type_register_static(&xensysdev_info);
|
|
type_register_static(&xendev_type_info);
|
|
}
|
|
|
|
type_init(xenbe_register_types)
|