The Xen qdisk backend needs to test whether grant copy operations is available in the kernel. Unfortunately this collides with using xengnttab_set_max_grants() on some kernels as this operation has to be the first one after opening the gnttab device. In order to solve this problem test for the availability of grant copy in xen_be_init() opening the gnttab device just for that purpose and closing it again afterwards. Advertise the availability via a global flag and use that flag in the qdisk backend. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
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 {
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free(bepath);
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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);
|
|
|
|
mc->has_dynamic_sysbus = true;
|
|
}
|
|
|
|
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)
|