xen: create xenstore areas for XenDevice-s
This patch adds a new source module, xen-bus-helper.c, which builds on
basic libxenstore primitives to provide functions to create (setting
permissions appropriately) and destroy xenstore areas, and functions to
'printf' and 'scanf' nodes therein. The main xen-bus code then uses
these primitives [1] to initialize and destroy the frontend and backend
areas for a XenDevice during realize and unrealize respectively.
The 'xen-block' implementation is extended with a 'get_name' method that
returns the VBD number. This number is required to 'name' the xenstore
areas.
NOTE: An exit handler is also added to make sure the xenstore areas are
cleaned up if QEMU terminates without devices being unrealized.
[1] The 'scanf' functions are actually not yet needed, but they will be
needed by code delivered in subsequent patches.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Anthony Perard <anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
This commit is contained in:
Paul Durrant
Anthony PERARD
parent
1a72d9ae31
commit
094a22399f
@ -13,6 +13,14 @@
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#include "hw/xen/xen-block.h"
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#include "trace.h"
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static char *xen_block_get_name(XenDevice *xendev, Error **errp)
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{
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XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
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XenBlockVdev *vdev = &blockdev->props.vdev;
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return g_strdup_printf("%lu", vdev->number);
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}
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static void xen_block_unrealize(XenDevice *xendev, Error **errp)
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{
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XenBlockDevice *blockdev = XEN_BLOCK_DEVICE(xendev);
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@ -262,6 +270,7 @@ static void xen_block_class_init(ObjectClass *class, void *data)
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DeviceClass *dev_class = DEVICE_CLASS(class);
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XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class);
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xendev_class->get_name = xen_block_get_name;
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xendev_class->realize = xen_block_realize;
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xendev_class->unrealize = xen_block_unrealize;
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@ -1,5 +1,5 @@
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# xen backend driver support
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common-obj-$(CONFIG_XEN) += xen-legacy-backend.o xen_devconfig.o xen_pvdev.o xen-common.o xen-bus.o
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common-obj-$(CONFIG_XEN) += xen-legacy-backend.o xen_devconfig.o xen_pvdev.o xen-common.o xen-bus.o xen-bus-helper.o
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obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
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obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
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@ -16,5 +16,13 @@ xen_domid_restrict(int err) "err: %u"
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# include/hw/xen/xen-bus.c
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xen_bus_realize(void) ""
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xen_bus_unrealize(void) ""
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xen_device_realize(const char *type) "type: %s"
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xen_device_unrealize(const char *type) "type: %s"
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xen_device_realize(const char *type, char *name) "type: %s name: %s"
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xen_device_unrealize(const char *type, char *name) "type: %s name: %s"
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xen_device_backend_state(const char *type, char *name, const char *state) "type: %s name: %s -> %s"
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xen_device_frontend_state(const char *type, char *name, const char *state) "type: %s name: %s -> %s"
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# include/hw/xen/xen-bus-helper.c
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xs_node_create(const char *node) "%s"
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xs_node_destroy(const char *node) "%s"
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xs_node_vprintf(char *path, char *value) "%s %s"
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xs_node_vscanf(char *path, char *value) "%s %s"
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150
hw/xen/xen-bus-helper.c
Normal file
150
hw/xen/xen-bus-helper.c
Normal file
@ -0,0 +1,150 @@
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/*
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* Copyright (c) 2018 Citrix Systems Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/hw.h"
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#include "hw/sysbus.h"
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#include "hw/xen/xen.h"
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#include "hw/xen/xen-bus.h"
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#include "hw/xen/xen-bus-helper.h"
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#include "qapi/error.h"
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#include <glib/gprintf.h>
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struct xs_state {
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enum xenbus_state statenum;
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const char *statestr;
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};
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#define XS_STATE(state) { state, #state }
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static struct xs_state xs_state[] = {
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XS_STATE(XenbusStateUnknown),
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XS_STATE(XenbusStateInitialising),
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XS_STATE(XenbusStateInitWait),
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XS_STATE(XenbusStateInitialised),
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XS_STATE(XenbusStateConnected),
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XS_STATE(XenbusStateClosing),
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XS_STATE(XenbusStateClosed),
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XS_STATE(XenbusStateReconfiguring),
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XS_STATE(XenbusStateReconfigured),
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};
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#undef XS_STATE
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const char *xs_strstate(enum xenbus_state state)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(xs_state); i++) {
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if (xs_state[i].statenum == state) {
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return xs_state[i].statestr;
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}
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}
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return "INVALID";
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}
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void xs_node_create(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, struct xs_permissions perms[],
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unsigned int nr_perms, Error **errp)
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{
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trace_xs_node_create(node);
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if (!xs_write(xsh, tid, node, "", 0)) {
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error_setg_errno(errp, errno, "failed to create node '%s'", node);
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return;
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}
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if (!xs_set_permissions(xsh, tid, node, perms, nr_perms)) {
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error_setg_errno(errp, errno, "failed to set node '%s' permissions",
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node);
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}
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}
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void xs_node_destroy(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, Error **errp)
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{
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trace_xs_node_destroy(node);
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if (!xs_rm(xsh, tid, node)) {
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error_setg_errno(errp, errno, "failed to destroy node '%s'", node);
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}
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}
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void xs_node_vprintf(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, const char *key, Error **errp,
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const char *fmt, va_list ap)
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{
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char *path, *value;
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int len;
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path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
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g_strdup(key);
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len = g_vasprintf(&value, fmt, ap);
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trace_xs_node_vprintf(path, value);
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if (!xs_write(xsh, tid, path, value, len)) {
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error_setg_errno(errp, errno, "failed to write '%s' to '%s'",
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value, path);
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}
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g_free(value);
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g_free(path);
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}
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void xs_node_printf(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, const char *key, Error **errp,
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const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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xs_node_vprintf(xsh, tid, node, key, errp, fmt, ap);
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va_end(ap);
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}
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int xs_node_vscanf(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, const char *key, Error **errp,
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const char *fmt, va_list ap)
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{
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char *path, *value;
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int rc;
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path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
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g_strdup(key);
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value = xs_read(xsh, tid, path, NULL);
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trace_xs_node_vscanf(path, value);
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if (value) {
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rc = vsscanf(value, fmt, ap);
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} else {
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error_setg_errno(errp, errno, "failed to read from '%s'",
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path);
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rc = EOF;
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}
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free(value);
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g_free(path);
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return rc;
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}
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int xs_node_scanf(struct xs_handle *xsh, xs_transaction_t tid,
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const char *node, const char *key, Error **errp,
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const char *fmt, ...)
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{
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va_list ap;
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int rc;
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va_start(ap, fmt);
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rc = xs_node_vscanf(xsh, tid, node, key, errp, fmt, ap);
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va_end(ap);
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return rc;
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}
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321
hw/xen/xen-bus.c
321
hw/xen/xen-bus.c
@ -8,24 +8,102 @@
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#include "qemu/osdep.h"
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#include "hw/hw.h"
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#include "hw/sysbus.h"
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#include "hw/xen/xen.h"
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#include "hw/xen/xen-bus.h"
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#include "hw/xen/xen-bus-helper.h"
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#include "monitor/monitor.h"
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#include "qapi/error.h"
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#include "sysemu/sysemu.h"
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#include "trace.h"
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static char *xen_device_get_backend_path(XenDevice *xendev)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(xendev));
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const char *backend = xendev_class->backend;
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if (!backend) {
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backend = type;
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}
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return g_strdup_printf("/local/domain/%u/backend/%s/%u/%s",
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xenbus->backend_id, backend, xendev->frontend_id,
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xendev->name);
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}
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static char *xen_device_get_frontend_path(XenDevice *xendev)
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{
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XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
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const char *type = object_get_typename(OBJECT(xendev));
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const char *device = xendev_class->device;
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if (!device) {
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device = type;
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}
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return g_strdup_printf("/local/domain/%u/device/%s/%s",
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xendev->frontend_id, device, xendev->name);
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}
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static void xen_bus_print_dev(Monitor *mon, DeviceState *dev, int indent)
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{
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XenDevice *xendev = XEN_DEVICE(dev);
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monitor_printf(mon, "%*sname = '%s' frontend_id = %u\n",
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indent, "", xendev->name, xendev->frontend_id);
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}
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static char *xen_bus_get_dev_path(DeviceState *dev)
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{
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return xen_device_get_backend_path(XEN_DEVICE(dev));
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}
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static void xen_bus_unrealize(BusState *bus, Error **errp)
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{
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XenBus *xenbus = XEN_BUS(bus);
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trace_xen_bus_unrealize();
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if (!xenbus->xsh) {
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return;
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}
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xs_close(xenbus->xsh);
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}
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static void xen_bus_realize(BusState *bus, Error **errp)
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{
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XenBus *xenbus = XEN_BUS(bus);
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unsigned int domid;
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trace_xen_bus_realize();
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xenbus->xsh = xs_open(0);
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if (!xenbus->xsh) {
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error_setg_errno(errp, errno, "failed xs_open");
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goto fail;
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}
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if (xs_node_scanf(xenbus->xsh, XBT_NULL, "", /* domain root node */
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"domid", NULL, "%u", &domid) == 1) {
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xenbus->backend_id = domid;
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} else {
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xenbus->backend_id = 0; /* Assume lack of node means dom0 */
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}
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return;
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fail:
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xen_bus_unrealize(bus, &error_abort);
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}
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static void xen_bus_class_init(ObjectClass *class, void *data)
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{
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BusClass *bus_class = BUS_CLASS(class);
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bus_class->print_dev = xen_bus_print_dev;
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bus_class->get_dev_path = xen_bus_get_dev_path;
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bus_class->realize = xen_bus_realize;
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bus_class->unrealize = xen_bus_unrealize;
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}
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@ -42,27 +120,241 @@ static const TypeInfo xen_bus_type_info = {
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},
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};
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static void xen_device_backend_printf(XenDevice *xendev, const char *key,
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const char *fmt, ...)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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Error *local_err = NULL;
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va_list ap;
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g_assert(xenbus->xsh);
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va_start(ap, fmt);
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xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->backend_path, key,
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&local_err, fmt, ap);
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va_end(ap);
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if (local_err) {
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error_report_err(local_err);
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}
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}
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static void xen_device_backend_set_state(XenDevice *xendev,
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enum xenbus_state state)
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{
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const char *type = object_get_typename(OBJECT(xendev));
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if (xendev->backend_state == state) {
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return;
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}
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trace_xen_device_backend_state(type, xendev->name,
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xs_strstate(state));
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xendev->backend_state = state;
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xen_device_backend_printf(xendev, "state", "%u", state);
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}
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static void xen_device_backend_create(XenDevice *xendev, Error **errp)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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struct xs_permissions perms[2];
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Error *local_err = NULL;
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xendev->backend_path = xen_device_get_backend_path(xendev);
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perms[0].id = xenbus->backend_id;
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perms[0].perms = XS_PERM_NONE;
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perms[1].id = xendev->frontend_id;
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perms[1].perms = XS_PERM_READ;
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g_assert(xenbus->xsh);
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xs_node_create(xenbus->xsh, XBT_NULL, xendev->backend_path, perms,
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ARRAY_SIZE(perms), &local_err);
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if (local_err) {
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error_propagate_prepend(errp, local_err,
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"failed to create backend: ");
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}
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}
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static void xen_device_backend_destroy(XenDevice *xendev)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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Error *local_err = NULL;
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if (!xendev->backend_path) {
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return;
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}
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g_assert(xenbus->xsh);
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xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->backend_path,
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&local_err);
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g_free(xendev->backend_path);
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xendev->backend_path = NULL;
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if (local_err) {
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error_report_err(local_err);
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}
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}
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static void xen_device_frontend_printf(XenDevice *xendev, const char *key,
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const char *fmt, ...)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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Error *local_err = NULL;
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va_list ap;
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g_assert(xenbus->xsh);
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va_start(ap, fmt);
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xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->frontend_path, key,
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&local_err, fmt, ap);
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va_end(ap);
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if (local_err) {
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error_report_err(local_err);
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}
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}
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static void xen_device_frontend_set_state(XenDevice *xendev,
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enum xenbus_state state)
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{
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const char *type = object_get_typename(OBJECT(xendev));
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if (xendev->frontend_state == state) {
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return;
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}
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trace_xen_device_frontend_state(type, xendev->name,
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xs_strstate(state));
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xendev->frontend_state = state;
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xen_device_frontend_printf(xendev, "state", "%u", state);
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}
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static void xen_device_frontend_create(XenDevice *xendev, Error **errp)
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{
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XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
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struct xs_permissions perms[2];
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Error *local_err = NULL;
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xendev->frontend_path = xen_device_get_frontend_path(xendev);
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perms[0].id = xendev->frontend_id;
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perms[0].perms = XS_PERM_NONE;
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perms[1].id = xenbus->backend_id;
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perms[1].perms = XS_PERM_READ | XS_PERM_WRITE;
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g_assert(xenbus->xsh);
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xs_node_create(xenbus->xsh, XBT_NULL, xendev->frontend_path, perms,
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ARRAY_SIZE(perms), &local_err);
|
||||
if (local_err) {
|
||||
error_propagate_prepend(errp, local_err,
|
||||
"failed to create frontend: ");
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_device_frontend_destroy(XenDevice *xendev)
|
||||
{
|
||||
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
||||
Error *local_err = NULL;
|
||||
|
||||
if (!xendev->frontend_path) {
|
||||
return;
|
||||
}
|
||||
|
||||
g_assert(xenbus->xsh);
|
||||
|
||||
xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->frontend_path,
|
||||
&local_err);
|
||||
g_free(xendev->frontend_path);
|
||||
xendev->frontend_path = NULL;
|
||||
|
||||
if (local_err) {
|
||||
error_report_err(local_err);
|
||||
}
|
||||
}
|
||||
|
||||
static void xen_device_unrealize(DeviceState *dev, Error **errp)
|
||||
{
|
||||
XenDevice *xendev = XEN_DEVICE(dev);
|
||||
XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
|
||||
const char *type = object_get_typename(OBJECT(xendev));
|
||||
|
||||
trace_xen_device_unrealize(type);
|
||||
if (!xendev->name) {
|
||||
return;
|
||||
}
|
||||
|
||||
trace_xen_device_unrealize(type, xendev->name);
|
||||
|
||||
if (xendev->exit.notify) {
|
||||
qemu_remove_exit_notifier(&xendev->exit);
|
||||
xendev->exit.notify = NULL;
|
||||
}
|
||||
|
||||
if (xendev_class->unrealize) {
|
||||
xendev_class->unrealize(xendev, errp);
|
||||
}
|
||||
|
||||
xen_device_frontend_destroy(xendev);
|
||||
xen_device_backend_destroy(xendev);
|
||||
|
||||
g_free(xendev->name);
|
||||
xendev->name = NULL;
|
||||
}
|
||||
|
||||
static void xen_device_exit(Notifier *n, void *data)
|
||||
{
|
||||
XenDevice *xendev = container_of(n, XenDevice, exit);
|
||||
|
||||
xen_device_unrealize(DEVICE(xendev), &error_abort);
|
||||
}
|
||||
|
||||
static void xen_device_realize(DeviceState *dev, Error **errp)
|
||||
{
|
||||
XenDevice *xendev = XEN_DEVICE(dev);
|
||||
XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
|
||||
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
|
||||
const char *type = object_get_typename(OBJECT(xendev));
|
||||
Error *local_err = NULL;
|
||||
|
||||
trace_xen_device_realize(type);
|
||||
if (xendev->frontend_id == DOMID_INVALID) {
|
||||
xendev->frontend_id = xen_domid;
|
||||
}
|
||||
|
||||
if (xendev->frontend_id >= DOMID_FIRST_RESERVED) {
|
||||
error_setg(errp, "invalid frontend-id");
|
||||
goto unrealize;
|
||||
}
|
||||
|
||||
if (!xendev_class->get_name) {
|
||||
error_setg(errp, "get_name method not implemented");
|
||||
goto unrealize;
|
||||
}
|
||||
|
||||
xendev->name = xendev_class->get_name(xendev, &local_err);
|
||||
if (local_err) {
|
||||
error_propagate_prepend(errp, local_err,
|
||||
"failed to get device name: ");
|
||||
goto unrealize;
|
||||
}
|
||||
|
||||
trace_xen_device_realize(type, xendev->name);
|
||||
|
||||
xen_device_backend_create(xendev, &local_err);
|
||||
if (local_err) {
|
||||
error_propagate(errp, local_err);
|
||||
goto unrealize;
|
||||
}
|
||||
|
||||
xen_device_frontend_create(xendev, &local_err);
|
||||
if (local_err) {
|
||||
error_propagate(errp, local_err);
|
||||
goto unrealize;
|
||||
}
|
||||
|
||||
if (xendev_class->realize) {
|
||||
xendev_class->realize(xendev, &local_err);
|
||||
@ -72,18 +364,43 @@ static void xen_device_realize(DeviceState *dev, Error **errp)
|
||||
}
|
||||
}
|
||||
|
||||
xen_device_backend_printf(xendev, "frontend", "%s",
|
||||
xendev->frontend_path);
|
||||
xen_device_backend_printf(xendev, "frontend-id", "%u",
|
||||
xendev->frontend_id);
|
||||
xen_device_backend_printf(xendev, "online", "%u", 1);
|
||||
xen_device_backend_printf(xendev, "hotplug-status", "connected");
|
||||
|
||||
xen_device_backend_set_state(xendev, XenbusStateInitWait);
|
||||
|
||||
xen_device_frontend_printf(xendev, "backend", "%s",
|
||||
xendev->backend_path);
|
||||
xen_device_frontend_printf(xendev, "backend-id", "%u",
|
||||
xenbus->backend_id);
|
||||
|
||||
xen_device_frontend_set_state(xendev, XenbusStateInitialising);
|
||||
|
||||
xendev->exit.notify = xen_device_exit;
|
||||
qemu_add_exit_notifier(&xendev->exit);
|
||||
return;
|
||||
|
||||
unrealize:
|
||||
xen_device_unrealize(dev, &error_abort);
|
||||
}
|
||||
|
||||
static Property xen_device_props[] = {
|
||||
DEFINE_PROP_UINT16("frontend-id", XenDevice, frontend_id,
|
||||
DOMID_INVALID),
|
||||
DEFINE_PROP_END_OF_LIST()
|
||||
};
|
||||
|
||||
static void xen_device_class_init(ObjectClass *class, void *data)
|
||||
{
|
||||
DeviceClass *dev_class = DEVICE_CLASS(class);
|
||||
|
||||
dev_class->realize = xen_device_realize;
|
||||
dev_class->unrealize = xen_device_unrealize;
|
||||
dev_class->props = xen_device_props;
|
||||
dev_class->bus_type = TYPE_XEN_BUS;
|
||||
}
|
||||
|
||||
|
||||
39
include/hw/xen/xen-bus-helper.h
Normal file
39
include/hw/xen/xen-bus-helper.h
Normal file
@ -0,0 +1,39 @@
|
||||
/*
|
||||
* Copyright (c) 2018 Citrix Systems Inc.
|
||||
*
|
||||
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
||||
* See the COPYING file in the top-level directory.
|
||||
*/
|
||||
|
||||
#ifndef HW_XEN_BUS_HELPER_H
|
||||
#define HW_XEN_BUS_HELPER_H
|
||||
|
||||
#include "hw/xen/xen_common.h"
|
||||
|
||||
const char *xs_strstate(enum xenbus_state state);
|
||||
|
||||
void xs_node_create(struct xs_handle *xsh, xs_transaction_t tid,
|
||||
const char *node, struct xs_permissions perms[],
|
||||
unsigned int nr_perms, Error **errp);
|
||||
void xs_node_destroy(struct xs_handle *xsh, xs_transaction_t tid,
|
||||
const char *node, Error **errp);
|
||||
|
||||
/* Write to node/key unless node is empty, in which case write to key */
|
||||
void xs_node_vprintf(struct xs_handle *xsh, xs_transaction_t tid,
|
||||
const char *node, const char *key, Error **errp,
|
||||
const char *fmt, va_list ap)
|
||||
GCC_FMT_ATTR(6, 0);
|
||||
void xs_node_printf(struct xs_handle *xsh, xs_transaction_t tid,
|
||||
const char *node, const char *key, Error **errp,
|
||||
const char *fmt, ...)
|
||||
GCC_FMT_ATTR(6, 7);
|
||||
|
||||
/* Read from node/key unless node is empty, in which case read from key */
|
||||
int xs_node_vscanf(struct xs_handle *xsh, xs_transaction_t tid,
|
||||
const char *node, const char *key, Error **errp,
|
||||
const char *fmt, va_list ap);
|
||||
int xs_node_scanf(struct xs_handle *xsh, xs_transaction_t tid,
|
||||
const char *node, const char *key, Error **errp,
|
||||
const char *fmt, ...);
|
||||
|
||||
#endif /* HW_XEN_BUS_HELPER_H */
|
||||
@ -8,12 +8,19 @@
|
||||
#ifndef HW_XEN_BUS_H
|
||||
#define HW_XEN_BUS_H
|
||||
|
||||
#include "hw/xen/xen_common.h"
|
||||
#include "hw/sysbus.h"
|
||||
|
||||
typedef struct XenDevice {
|
||||
DeviceState qdev;
|
||||
domid_t frontend_id;
|
||||
char *name;
|
||||
char *backend_path, *frontend_path;
|
||||
enum xenbus_state backend_state, frontend_state;
|
||||
Notifier exit;
|
||||
} XenDevice;
|
||||
|
||||
typedef char *(*XenDeviceGetName)(XenDevice *xendev, Error **errp);
|
||||
typedef void (*XenDeviceRealize)(XenDevice *xendev, Error **errp);
|
||||
typedef void (*XenDeviceUnrealize)(XenDevice *xendev, Error **errp);
|
||||
|
||||
@ -21,6 +28,9 @@ typedef struct XenDeviceClass {
|
||||
/*< private >*/
|
||||
DeviceClass parent_class;
|
||||
/*< public >*/
|
||||
const char *backend;
|
||||
const char *device;
|
||||
XenDeviceGetName get_name;
|
||||
XenDeviceRealize realize;
|
||||
XenDeviceUnrealize unrealize;
|
||||
} XenDeviceClass;
|
||||
@ -35,6 +45,8 @@ typedef struct XenDeviceClass {
|
||||
|
||||
typedef struct XenBus {
|
||||
BusState qbus;
|
||||
domid_t backend_id;
|
||||
struct xs_handle *xsh;
|
||||
} XenBus;
|
||||
|
||||
typedef struct XenBusClass {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user