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hw/xen: Add xenstore operations to allow redirection to internal emulation

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Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
Paul Durrant 2023-01-02 11:05:16 +00:00 committed by David Woodhouse
parent 15e283c5b6
commit ba2a92db1f
18 changed files with 532 additions and 416 deletions
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11
accel/xen/xen-all.c
View File

@ -90,12 +90,15 @@ void xenstore_store_pv_console_info(int i, Chardev *chr)
}
static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
static void xenstore_record_dm_state(const char *state)
{
struct xs_handle *xs;
char path[50];
/* We now have everything we need to set the xenstore entry. */
xs = xs_open(0);
if (xs == NULL) {
error_report("xenstore connection not initialized");
fprintf(stderr, "Could not contact XenStore\n");
exit(1);
}
@ -109,6 +112,8 @@ static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
error_report("error recording dm state");
exit(1);
}
xs_close(xs);
}
@ -117,7 +122,7 @@ static void xen_change_state_handler(void *opaque, bool running,
{
if (running) {
/* record state running */
xenstore_record_dm_state(xenstore, "running");
xenstore_record_dm_state("running");
}
}

2
hw/char/xen_console.c
View File

@ -181,7 +181,7 @@ static int con_init(struct XenLegacyDevice *xendev)
const char *output;
/* setup */
dom = xs_get_domain_path(xenstore, con->xendev.dom);
dom = qemu_xen_xs_get_domain_path(xenstore, con->xendev.dom);
if (!xendev->dev) {
snprintf(con->console, sizeof(con->console), "%s/console", dom);
} else {

3
hw/i386/kvm/xen_xenstore.c
View File

@ -38,9 +38,6 @@
#define TYPE_XEN_XENSTORE "xen-xenstore"
OBJECT_DECLARE_SIMPLE_TYPE(XenXenstoreState, XEN_XENSTORE)
#define XEN_PAGE_SHIFT 12
#define XEN_PAGE_SIZE (1ULL << XEN_PAGE_SHIFT)
#define ENTRIES_PER_FRAME_V1 (XEN_PAGE_SIZE / sizeof(grant_entry_v1_t))
#define ENTRIES_PER_FRAME_V2 (XEN_PAGE_SIZE / sizeof(grant_entry_v2_t))

8
hw/i386/kvm/xenstore_impl.h
View File

@ -12,13 +12,7 @@
#ifndef QEMU_XENSTORE_IMPL_H
#define QEMU_XENSTORE_IMPL_H
typedef uint32_t xs_transaction_t;
#define XBT_NULL 0
#define XS_PERM_NONE 0x00
#define XS_PERM_READ 0x01
#define XS_PERM_WRITE 0x02
#include "hw/xen/xen_backend_ops.h"
typedef struct XenstoreImplState XenstoreImplState;

62
hw/xen/xen-bus-helper.c
View File

@ -10,6 +10,7 @@
#include "hw/xen/xen-bus.h"
#include "hw/xen/xen-bus-helper.h"
#include "qapi/error.h"
#include "trace.h"
#include <glib/gprintf.h>
@ -46,34 +47,28 @@ const char *xs_strstate(enum xenbus_state state)
return "INVALID";
}
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_create(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, unsigned int owner, unsigned int domid,
unsigned int perms, Error **errp)
{
trace_xs_node_create(node);
if (!xs_write(xsh, tid, node, "", 0)) {
if (!qemu_xen_xs_create(h, tid, owner, domid, perms, node)) {
error_setg_errno(errp, errno, "failed to create node '%s'", node);
return;
}
if (!xs_set_permissions(xsh, tid, node, perms, nr_perms)) {
error_setg_errno(errp, errno, "failed to set node '%s' permissions",
node);
}
}
void xs_node_destroy(struct xs_handle *xsh, xs_transaction_t tid,
void xs_node_destroy(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, Error **errp)
{
trace_xs_node_destroy(node);
if (!xs_rm(xsh, tid, node)) {
if (!qemu_xen_xs_destroy(h, tid, node)) {
error_setg_errno(errp, errno, "failed to destroy node '%s'", node);
}
}
void xs_node_vprintf(struct xs_handle *xsh, xs_transaction_t tid,
void xs_node_vprintf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, va_list ap)
{
@ -86,7 +81,7 @@ void xs_node_vprintf(struct xs_handle *xsh, xs_transaction_t tid,
trace_xs_node_vprintf(path, value);
if (!xs_write(xsh, tid, path, value, len)) {
if (!qemu_xen_xs_write(h, tid, path, value, len)) {
error_setg_errno(errp, errno, "failed to write '%s' to '%s'",
value, path);
}
@ -95,18 +90,18 @@ void xs_node_vprintf(struct xs_handle *xsh, xs_transaction_t tid,
g_free(path);
}
void xs_node_printf(struct xs_handle *xsh, xs_transaction_t tid,
void xs_node_printf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
xs_node_vprintf(xsh, tid, node, key, errp, fmt, ap);
xs_node_vprintf(h, tid, node, key, errp, fmt, ap);
va_end(ap);
}
int xs_node_vscanf(struct xs_handle *xsh, xs_transaction_t tid,
int xs_node_vscanf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, va_list ap)
{
@ -115,7 +110,7 @@ int xs_node_vscanf(struct xs_handle *xsh, xs_transaction_t tid,
path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
g_strdup(key);
value = xs_read(xsh, tid, path, NULL);
value = qemu_xen_xs_read(h, tid, path, NULL);
trace_xs_node_vscanf(path, value);
@ -133,7 +128,7 @@ int xs_node_vscanf(struct xs_handle *xsh, xs_transaction_t tid,
return rc;
}
int xs_node_scanf(struct xs_handle *xsh, xs_transaction_t tid,
int xs_node_scanf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, ...)
{
@ -141,42 +136,35 @@ int xs_node_scanf(struct xs_handle *xsh, xs_transaction_t tid,
int rc;
va_start(ap, fmt);
rc = xs_node_vscanf(xsh, tid, node, key, errp, fmt, ap);
rc = xs_node_vscanf(h, tid, node, key, errp, fmt, ap);
va_end(ap);
return rc;
}
void xs_node_watch(struct xs_handle *xsh, const char *node, const char *key,
char *token, Error **errp)
struct qemu_xs_watch *xs_node_watch(struct qemu_xs_handle *h, const char *node,
const char *key, xs_watch_fn fn,
void *opaque, Error **errp)
{
char *path;
struct qemu_xs_watch *w;
path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
g_strdup(key);
trace_xs_node_watch(path);
if (!xs_watch(xsh, path, token)) {
w = qemu_xen_xs_watch(h, path, fn, opaque);
if (!w) {
error_setg_errno(errp, errno, "failed to watch node '%s'", path);
}
g_free(path);
return w;
}
void xs_node_unwatch(struct xs_handle *xsh, const char *node,
const char *key, const char *token, Error **errp)
void xs_node_unwatch(struct qemu_xs_handle *h, struct qemu_xs_watch *w)
{
char *path;
path = (strlen(node) != 0) ? g_strdup_printf("%s/%s", node, key) :
g_strdup(key);
trace_xs_node_unwatch(path);
if (!xs_unwatch(xsh, path, token)) {
error_setg_errno(errp, errno, "failed to unwatch node '%s'", path);
}
g_free(path);
qemu_xen_xs_unwatch(h, w);
}

257
hw/xen/xen-bus.c
View File

@ -62,7 +62,7 @@ static void xen_device_unplug(XenDevice *xendev, Error **errp)
/* Mimic the way the Xen toolstack does an unplug */
again:
tid = xs_transaction_start(xenbus->xsh);
tid = qemu_xen_xs_transaction_start(xenbus->xsh);
if (tid == XBT_NULL) {
error_setg_errno(errp, errno, "failed xs_transaction_start");
return;
@ -80,7 +80,7 @@ again:
goto abort;
}
if (!xs_transaction_end(xenbus->xsh, tid, false)) {
if (!qemu_xen_xs_transaction_end(xenbus->xsh, tid, false)) {
if (errno == EAGAIN) {
goto again;
}
@ -95,7 +95,7 @@ abort:
* We only abort if there is already a failure so ignore any error
* from ending the transaction.
*/
xs_transaction_end(xenbus->xsh, tid, true);
qemu_xen_xs_transaction_end(xenbus->xsh, tid, true);
}
static void xen_bus_print_dev(Monitor *mon, DeviceState *dev, int indent)
@ -111,143 +111,6 @@ static char *xen_bus_get_dev_path(DeviceState *dev)
return xen_device_get_backend_path(XEN_DEVICE(dev));
}
struct XenWatch {
char *node, *key;
char *token;
XenWatchHandler handler;
void *opaque;
Notifier notifier;
};
static void watch_notify(Notifier *n, void *data)
{
XenWatch *watch = container_of(n, XenWatch, notifier);
const char *token = data;
if (!strcmp(watch->token, token)) {
watch->handler(watch->opaque);
}
}
static XenWatch *new_watch(const char *node, const char *key,
XenWatchHandler handler, void *opaque)
{
XenWatch *watch = g_new0(XenWatch, 1);
QemuUUID uuid;
qemu_uuid_generate(&uuid);
watch->token = qemu_uuid_unparse_strdup(&uuid);
watch->node = g_strdup(node);
watch->key = g_strdup(key);
watch->handler = handler;
watch->opaque = opaque;
watch->notifier.notify = watch_notify;
return watch;
}
static void free_watch(XenWatch *watch)
{
g_free(watch->token);
g_free(watch->key);
g_free(watch->node);
g_free(watch);
}
struct XenWatchList {
struct xs_handle *xsh;
NotifierList notifiers;
};
static void watch_list_event(void *opaque)
{
XenWatchList *watch_list = opaque;
char **v;
const char *token;
v = xs_check_watch(watch_list->xsh);
if (!v) {
return;
}
token = v[XS_WATCH_TOKEN];
notifier_list_notify(&watch_list->notifiers, (void *)token);
free(v);
}
static XenWatchList *watch_list_create(struct xs_handle *xsh)
{
XenWatchList *watch_list = g_new0(XenWatchList, 1);
g_assert(xsh);
watch_list->xsh = xsh;
notifier_list_init(&watch_list->notifiers);
qemu_set_fd_handler(xs_fileno(watch_list->xsh), watch_list_event, NULL,
watch_list);
return watch_list;
}
static void watch_list_destroy(XenWatchList *watch_list)
{
g_assert(notifier_list_empty(&watch_list->notifiers));
qemu_set_fd_handler(xs_fileno(watch_list->xsh), NULL, NULL, NULL);
g_free(watch_list);
}
static XenWatch *watch_list_add(XenWatchList *watch_list, const char *node,
const char *key, XenWatchHandler handler,
void *opaque, Error **errp)
{
ERRP_GUARD();
XenWatch *watch = new_watch(node, key, handler, opaque);
notifier_list_add(&watch_list->notifiers, &watch->notifier);
xs_node_watch(watch_list->xsh, node, key, watch->token, errp);
if (*errp) {
notifier_remove(&watch->notifier);
free_watch(watch);
return NULL;
}
return watch;
}
static void watch_list_remove(XenWatchList *watch_list, XenWatch *watch,
Error **errp)
{
xs_node_unwatch(watch_list->xsh, watch->node, watch->key, watch->token,
errp);
notifier_remove(&watch->notifier);
free_watch(watch);
}
static XenWatch *xen_bus_add_watch(XenBus *xenbus, const char *node,
const char *key, XenWatchHandler handler,
Error **errp)
{
trace_xen_bus_add_watch(node, key);
return watch_list_add(xenbus->watch_list, node, key, handler, xenbus,
errp);
}
static void xen_bus_remove_watch(XenBus *xenbus, XenWatch *watch,
Error **errp)
{
trace_xen_bus_remove_watch(watch->node, watch->key);
watch_list_remove(xenbus->watch_list, watch, errp);
}
static void xen_bus_backend_create(XenBus *xenbus, const char *type,
const char *name, char *path,
Error **errp)
@ -261,15 +124,15 @@ static void xen_bus_backend_create(XenBus *xenbus, const char *type,
trace_xen_bus_backend_create(type, path);
again:
tid = xs_transaction_start(xenbus->xsh);
tid = qemu_xen_xs_transaction_start(xenbus->xsh);
if (tid == XBT_NULL) {
error_setg(errp, "failed xs_transaction_start");
return;
}
key = xs_directory(xenbus->xsh, tid, path, &n);
key = qemu_xen_xs_directory(xenbus->xsh, tid, path, &n);
if (!key) {
if (!xs_transaction_end(xenbus->xsh, tid, true)) {
if (!qemu_xen_xs_transaction_end(xenbus->xsh, tid, true)) {
error_setg_errno(errp, errno, "failed xs_transaction_end");
}
return;
@ -300,7 +163,7 @@ again:
free(key);
if (!xs_transaction_end(xenbus->xsh, tid, false)) {
if (!qemu_xen_xs_transaction_end(xenbus->xsh, tid, false)) {
qobject_unref(opts);
if (errno == EAGAIN) {
@ -327,7 +190,7 @@ static void xen_bus_type_enumerate(XenBus *xenbus, const char *type)
trace_xen_bus_type_enumerate(type);
backend = xs_directory(xenbus->xsh, XBT_NULL, domain_path, &n);
backend = qemu_xen_xs_directory(xenbus->xsh, XBT_NULL, domain_path, &n);
if (!backend) {
goto out;
}
@ -372,7 +235,7 @@ static void xen_bus_enumerate(XenBus *xenbus)
trace_xen_bus_enumerate();
type = xs_directory(xenbus->xsh, XBT_NULL, "backend", &n);
type = qemu_xen_xs_directory(xenbus->xsh, XBT_NULL, "backend", &n);
if (!type) {
return;
}
@ -415,7 +278,7 @@ static void xen_bus_cleanup(XenBus *xenbus)
}
}
static void xen_bus_backend_changed(void *opaque)
static void xen_bus_backend_changed(void *opaque, const char *path)
{
XenBus *xenbus = opaque;
@ -434,7 +297,7 @@ static void xen_bus_unrealize(BusState *bus)
for (i = 0; i < xenbus->backend_types; i++) {
if (xenbus->backend_watch[i]) {
xen_bus_remove_watch(xenbus, xenbus->backend_watch[i], NULL);
xs_node_unwatch(xenbus->xsh, xenbus->backend_watch[i]);
}
}
@ -442,13 +305,8 @@ static void xen_bus_unrealize(BusState *bus)
xenbus->backend_watch = NULL;
}
if (xenbus->watch_list) {
watch_list_destroy(xenbus->watch_list);
xenbus->watch_list = NULL;
}
if (xenbus->xsh) {
xs_close(xenbus->xsh);
qemu_xen_xs_close(xenbus->xsh);
}
}
@ -463,7 +321,7 @@ static void xen_bus_realize(BusState *bus, Error **errp)
trace_xen_bus_realize();
xenbus->xsh = xs_open(0);
xenbus->xsh = qemu_xen_xs_open();
if (!xenbus->xsh) {
error_setg_errno(errp, errno, "failed xs_open");
goto fail;
@ -476,19 +334,18 @@ static void xen_bus_realize(BusState *bus, Error **errp)
xenbus->backend_id = 0; /* Assume lack of node means dom0 */
}
xenbus->watch_list = watch_list_create(xenbus->xsh);
module_call_init(MODULE_INIT_XEN_BACKEND);
type = xen_backend_get_types(&xenbus->backend_types);
xenbus->backend_watch = g_new(XenWatch *, xenbus->backend_types);
xenbus->backend_watch = g_new(struct qemu_xs_watch *,
xenbus->backend_types);
for (i = 0; i < xenbus->backend_types; i++) {
char *node = g_strdup_printf("backend/%s", type[i]);
xenbus->backend_watch[i] =
xen_bus_add_watch(xenbus, node, key, xen_bus_backend_changed,
&local_err);
xs_node_watch(xenbus->xsh, node, key, xen_bus_backend_changed,
xenbus, &local_err);
if (local_err) {
/* This need not be treated as a hard error so don't propagate */
error_reportf_err(local_err,
@ -631,7 +488,7 @@ static bool xen_device_frontend_is_active(XenDevice *xendev)
}
}
static void xen_device_backend_changed(void *opaque)
static void xen_device_backend_changed(void *opaque, const char *path)
{
XenDevice *xendev = opaque;
const char *type = object_get_typename(OBJECT(xendev));
@ -685,56 +542,25 @@ static void xen_device_backend_changed(void *opaque)
}
}
static XenWatch *xen_device_add_watch(XenDevice *xendev, const char *node,
const char *key,
XenWatchHandler handler,
Error **errp)
{
const char *type = object_get_typename(OBJECT(xendev));
trace_xen_device_add_watch(type, xendev->name, node, key);
return watch_list_add(xendev->watch_list, node, key, handler, xendev,
errp);
}
static void xen_device_remove_watch(XenDevice *xendev, XenWatch *watch,
Error **errp)
{
const char *type = object_get_typename(OBJECT(xendev));
trace_xen_device_remove_watch(type, xendev->name, watch->node,
watch->key);
watch_list_remove(xendev->watch_list, watch, errp);
}
static void xen_device_backend_create(XenDevice *xendev, Error **errp)
{
ERRP_GUARD();
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
struct xs_permissions perms[2];
xendev->backend_path = xen_device_get_backend_path(xendev);
perms[0].id = xenbus->backend_id;
perms[0].perms = XS_PERM_NONE;
perms[1].id = xendev->frontend_id;
perms[1].perms = XS_PERM_READ;
g_assert(xenbus->xsh);
xs_node_create(xenbus->xsh, XBT_NULL, xendev->backend_path, perms,
ARRAY_SIZE(perms), errp);
xs_node_create(xenbus->xsh, XBT_NULL, xendev->backend_path,
xenbus->backend_id, xendev->frontend_id, XS_PERM_READ, errp);
if (*errp) {
error_prepend(errp, "failed to create backend: ");
return;
}
xendev->backend_state_watch =
xen_device_add_watch(xendev, xendev->backend_path,
"state", xen_device_backend_changed,
xs_node_watch(xendev->xsh, xendev->backend_path,
"state", xen_device_backend_changed, xendev,
errp);
if (*errp) {
error_prepend(errp, "failed to watch backend state: ");
@ -742,8 +568,8 @@ static void xen_device_backend_create(XenDevice *xendev, Error **errp)
}
xendev->backend_online_watch =
xen_device_add_watch(xendev, xendev->backend_path,
"online", xen_device_backend_changed,
xs_node_watch(xendev->xsh, xendev->backend_path,
"online", xen_device_backend_changed, xendev,
errp);
if (*errp) {
error_prepend(errp, "failed to watch backend online: ");
@ -757,12 +583,12 @@ static void xen_device_backend_destroy(XenDevice *xendev)
Error *local_err = NULL;
if (xendev->backend_online_watch) {
xen_device_remove_watch(xendev, xendev->backend_online_watch, NULL);
xs_node_unwatch(xendev->xsh, xendev->backend_online_watch);
xendev->backend_online_watch = NULL;
}
if (xendev->backend_state_watch) {
xen_device_remove_watch(xendev, xendev->backend_state_watch, NULL);
xs_node_unwatch(xendev->xsh, xendev->backend_state_watch);
xendev->backend_state_watch = NULL;
}
@ -837,7 +663,7 @@ static void xen_device_frontend_set_state(XenDevice *xendev,
}
}
static void xen_device_frontend_changed(void *opaque)
static void xen_device_frontend_changed(void *opaque, const char *path)
{
XenDevice *xendev = opaque;
XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev);
@ -885,7 +711,6 @@ static void xen_device_frontend_create(XenDevice *xendev, Error **errp)
{
ERRP_GUARD();
XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev)));
struct xs_permissions perms[2];
xendev->frontend_path = xen_device_get_frontend_path(xendev);
@ -894,15 +719,11 @@ static void xen_device_frontend_create(XenDevice *xendev, Error **errp)
* toolstack.
*/
if (!xen_device_frontend_exists(xendev)) {
perms[0].id = xendev->frontend_id;
perms[0].perms = XS_PERM_NONE;
perms[1].id = xenbus->backend_id;
perms[1].perms = XS_PERM_READ | XS_PERM_WRITE;
g_assert(xenbus->xsh);
xs_node_create(xenbus->xsh, XBT_NULL, xendev->frontend_path, perms,
ARRAY_SIZE(perms), errp);
xs_node_create(xenbus->xsh, XBT_NULL, xendev->frontend_path,
xendev->frontend_id, xenbus->backend_id,
XS_PERM_READ | XS_PERM_WRITE, errp);
if (*errp) {
error_prepend(errp, "failed to create frontend: ");
return;
@ -910,8 +731,8 @@ static void xen_device_frontend_create(XenDevice *xendev, Error **errp)
}
xendev->frontend_state_watch =
xen_device_add_watch(xendev, xendev->frontend_path, "state",
xen_device_frontend_changed, errp);
xs_node_watch(xendev->xsh, xendev->frontend_path, "state",
xen_device_frontend_changed, xendev, errp);
if (*errp) {
error_prepend(errp, "failed to watch frontend state: ");
}
@ -923,8 +744,7 @@ static void xen_device_frontend_destroy(XenDevice *xendev)
Error *local_err = NULL;
if (xendev->frontend_state_watch) {
xen_device_remove_watch(xendev, xendev->frontend_state_watch,
NULL);
xs_node_unwatch(xendev->xsh, xendev->frontend_state_watch);
xendev->frontend_state_watch = NULL;
}
@ -1146,13 +966,8 @@ static void xen_device_unrealize(DeviceState *dev)
xendev->xgth = NULL;
}
if (xendev->watch_list) {
watch_list_destroy(xendev->watch_list);
xendev->watch_list = NULL;
}
if (xendev->xsh) {
xs_close(xendev->xsh);
qemu_xen_xs_close(xendev->xsh);
xendev->xsh = NULL;
}
@ -1197,14 +1012,12 @@ static void xen_device_realize(DeviceState *dev, Error **errp)
trace_xen_device_realize(type, xendev->name);
xendev->xsh = xs_open(0);
xendev->xsh = qemu_xen_xs_open();
if (!xendev->xsh) {
error_setg_errno(errp, errno, "failed xs_open");
goto unrealize;
}
xendev->watch_list = watch_list_create(xendev->xsh);
xendev->xgth = qemu_xen_gnttab_open();
if (!xendev->xgth) {
error_setg_errno(errp, errno, "failed xengnttab_open");

133
hw/xen/xen-legacy-backend.c
View File

@ -39,7 +39,7 @@ BusState *xen_sysbus;
/* ------------------------------------------------------------- */
/* public */
struct xs_handle *xenstore;
struct qemu_xs_handle *xenstore;
const char *xen_protocol;
/* private */
@ -274,6 +274,25 @@ static void xen_be_frontend_changed(struct XenLegacyDevice *xendev,
}
}
static void xenstore_update_fe(void *opaque, const char *watch)
{
struct XenLegacyDevice *xendev = opaque;
const 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);
}
/* ------------------------------------------------------------- */
/* Check for possible state transitions and perform them. */
@ -287,7 +306,6 @@ static void xen_be_frontend_changed(struct XenLegacyDevice *xendev,
*/
static int xen_be_try_setup(struct XenLegacyDevice *xendev)
{
char token[XEN_BUFSIZE];
int be_state;
if (xenstore_read_be_int(xendev, "state", &be_state) == -1) {
@ -308,8 +326,9 @@ static int xen_be_try_setup(struct XenLegacyDevice *xendev)
}
/* setup frontend watch */
snprintf(token, sizeof(token), "fe:%p", xendev);
if (!xs_watch(xenstore, xendev->fe, token)) {
xendev->watch = qemu_xen_xs_watch(xenstore, xendev->fe, xenstore_update_fe,
xendev);
if (!xendev->watch) {
xen_pv_printf(xendev, 0, "watching frontend path (%s) failed\n",
xendev->fe);
return -1;
@ -498,24 +517,67 @@ void xen_be_check_state(struct XenLegacyDevice *xendev)
/* ------------------------------------------------------------- */
struct xenstore_be {
const char *type;
int dom;
struct XenDevOps *ops;
};
static void xenstore_update_be(void *opaque, const char *watch)
{
struct xenstore_be *be = opaque;
struct XenLegacyDevice *xendev;
char path[XEN_BUFSIZE], *bepath;
unsigned int len, dev;
len = snprintf(path, sizeof(path), "backend/%s/%d", be->type, be->dom);
if (strncmp(path, watch, len) != 0) {
return;
}
if (sscanf(watch + len, "/%u/%255s", &dev, path) != 2) {
strcpy(path, "");
if (sscanf(watch + len, "/%u", &dev) != 1) {
dev = -1;
}
}
if (dev == -1) {
return;
}
xendev = xen_be_get_xendev(be->type, be->dom, dev, be->ops);
if (xendev != NULL) {
bepath = qemu_xen_xs_read(xenstore, 0, xendev->be, &len);
if (bepath == NULL) {
xen_pv_del_xendev(xendev);
} else {
free(bepath);
xen_be_backend_changed(xendev, path);
xen_be_check_state(xendev);
}
}
}
static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
{
struct XenLegacyDevice *xendev;
char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
char path[XEN_BUFSIZE];
struct xenstore_be *be = g_new0(struct xenstore_be, 1);
char **dev = NULL;
unsigned int cdev, j;
/* setup watch */
snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops);
be->type = type;
be->dom = dom;
be->ops = ops;
snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
if (!xs_watch(xenstore, path, token)) {
if (!qemu_xen_xs_watch(xenstore, path, xenstore_update_be, be)) {
xen_pv_printf(NULL, 0, "xen be: watching backend path (%s) failed\n",
path);
return -1;
}
/* look for backends */
dev = xs_directory(xenstore, 0, path, &cdev);
dev = qemu_xen_xs_directory(xenstore, 0, path, &cdev);
if (!dev) {
return 0;
}
@ -530,57 +592,6 @@ static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
return 0;
}
void xenstore_update_be(char *watch, char *type, int dom,
struct XenDevOps *ops)
{
struct XenLegacyDevice *xendev;
char path[XEN_BUFSIZE], *bepath;
unsigned int len, dev;
len = snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
if (strncmp(path, watch, len) != 0) {
return;
}
if (sscanf(watch + len, "/%u/%255s", &dev, path) != 2) {
strcpy(path, "");
if (sscanf(watch + len, "/%u", &dev) != 1) {
dev = -1;
}
}
if (dev == -1) {
return;
}
xendev = xen_be_get_xendev(type, dom, dev, ops);
if (xendev != NULL) {
bepath = xs_read(xenstore, 0, xendev->be, &len);
if (bepath == NULL) {
xen_pv_del_xendev(xendev);
} else {
free(bepath);
xen_be_backend_changed(xendev, path);
xen_be_check_state(xendev);
}
}
}
void xenstore_update_fe(char *watch, struct XenLegacyDevice *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);
}
/* -------------------------------------------------------------------- */
static void xen_set_dynamic_sysbus(void)
@ -594,14 +605,12 @@ static void xen_set_dynamic_sysbus(void)
void xen_be_init(void)
{
xenstore = xs_daemon_open();
xenstore = qemu_xen_xs_open();
if (!xenstore) {
xen_pv_printf(NULL, 0, "can't connect to xenstored\n");
exit(1);
}
qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL);
if (xen_evtchn_ops == NULL || xen_gnttab_ops == NULL) {
xen_pv_printf(NULL, 0, "Xen operations not set up\n");
exit(1);

198
hw/xen/xen-operations.c
View File

@ -10,6 +10,7 @@
*/
#include "qemu/osdep.h"
#include "qemu/uuid.h"
#include "qapi/error.h"
#include "hw/xen/xen_backend_ops.h"
@ -262,6 +263,202 @@ struct foreignmem_backend_ops libxenforeignmem_backend_ops = {
.unmap = libxenforeignmem_backend_unmap,
};
struct qemu_xs_handle {
struct xs_handle *xsh;
NotifierList notifiers;
};
static void watch_event(void *opaque)
{
struct qemu_xs_handle *h = opaque;
for (;;) {
char **v = xs_check_watch(h->xsh);
if (!v) {
break;
}
notifier_list_notify(&h->notifiers, v);
free(v);
}
}
static struct qemu_xs_handle *libxenstore_open(void)
{
struct xs_handle *xsh = xs_open(0);
struct qemu_xs_handle *h = g_new0(struct qemu_xs_handle, 1);
if (!xsh) {
return NULL;
}
h = g_new0(struct qemu_xs_handle, 1);
h->xsh = xsh;
notifier_list_init(&h->notifiers);
qemu_set_fd_handler(xs_fileno(h->xsh), watch_event, NULL, h);
return h;
}
static void libxenstore_close(struct qemu_xs_handle *h)
{
g_assert(notifier_list_empty(&h->notifiers));
qemu_set_fd_handler(xs_fileno(h->xsh), NULL, NULL, NULL);
xs_close(h->xsh);
g_free(h);
}
static char *libxenstore_get_domain_path(struct qemu_xs_handle *h,
unsigned int domid)
{
return xs_get_domain_path(h->xsh, domid);
}
static char **libxenstore_directory(struct qemu_xs_handle *h,
xs_transaction_t t, const char *path,
unsigned int *num)
{
return xs_directory(h->xsh, t, path, num);
}
static void *libxenstore_read(struct qemu_xs_handle *h, xs_transaction_t t,
const char *path, unsigned int *len)
{
return xs_read(h->xsh, t, path, len);
}
static bool libxenstore_write(struct qemu_xs_handle *h, xs_transaction_t t,
const char *path, const void *data,
unsigned int len)
{
return xs_write(h->xsh, t, path, data, len);
}
static bool libxenstore_create(struct qemu_xs_handle *h, xs_transaction_t t,
unsigned int owner, unsigned int domid,
unsigned int perms, const char *path)
{
struct xs_permissions perms_list[] = {
{
.id = owner,
.perms = XS_PERM_NONE,
},
{
.id = domid,
.perms = perms,
},
};
if (!xs_mkdir(h->xsh, t, path)) {
return false;
}
return xs_set_permissions(h->xsh, t, path, perms_list,
ARRAY_SIZE(perms_list));
}
static bool libxenstore_destroy(struct qemu_xs_handle *h, xs_transaction_t t,
const char *path)
{
return xs_rm(h->xsh, t, path);
}
struct qemu_xs_watch {
char *path;
char *token;
xs_watch_fn fn;
void *opaque;
Notifier notifier;
};
static void watch_notify(Notifier *n, void *data)
{
struct qemu_xs_watch *w = container_of(n, struct qemu_xs_watch, notifier);
const char **v = data;
if (!strcmp(w->token, v[XS_WATCH_TOKEN])) {
w->fn(w->opaque, v[XS_WATCH_PATH]);
}
}
static struct qemu_xs_watch *new_watch(const char *path, xs_watch_fn fn,
void *opaque)
{
struct qemu_xs_watch *w = g_new0(struct qemu_xs_watch, 1);
QemuUUID uuid;
qemu_uuid_generate(&uuid);
w->token = qemu_uuid_unparse_strdup(&uuid);
w->path = g_strdup(path);
w->fn = fn;
w->opaque = opaque;
w->notifier.notify = watch_notify;
return w;
}
static void free_watch(struct qemu_xs_watch *w)
{
g_free(w->token);
g_free(w->path);
g_free(w);
}
static struct qemu_xs_watch *libxenstore_watch(struct qemu_xs_handle *h,
const char *path, xs_watch_fn fn,
void *opaque)
{
struct qemu_xs_watch *w = new_watch(path, fn, opaque);
notifier_list_add(&h->notifiers, &w->notifier);
if (!xs_watch(h->xsh, path, w->token)) {
notifier_remove(&w->notifier);
free_watch(w);
return NULL;
}
return w;
}
static void libxenstore_unwatch(struct qemu_xs_handle *h,
struct qemu_xs_watch *w)
{
xs_unwatch(h->xsh, w->path, w->token);
notifier_remove(&w->notifier);
free_watch(w);
}
static xs_transaction_t libxenstore_transaction_start(struct qemu_xs_handle *h)
{
return xs_transaction_start(h->xsh);
}
static bool libxenstore_transaction_end(struct qemu_xs_handle *h,
xs_transaction_t t, bool abort)
{
return xs_transaction_end(h->xsh, t, abort);
}
struct xenstore_backend_ops libxenstore_backend_ops = {
.open = libxenstore_open,
.close = libxenstore_close,
.get_domain_path = libxenstore_get_domain_path,
.directory = libxenstore_directory,
.read = libxenstore_read,
.write = libxenstore_write,
.create = libxenstore_create,
.destroy = libxenstore_destroy,
.watch = libxenstore_watch,
.unwatch = libxenstore_unwatch,
.transaction_start = libxenstore_transaction_start,
.transaction_end = libxenstore_transaction_end,
};
void setup_xen_backend_ops(void)
{
#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40800
@ -277,4 +474,5 @@ void setup_xen_backend_ops(void)
xen_evtchn_ops = &libxenevtchn_backend_ops;
xen_gnttab_ops = &libxengnttab_backend_ops;
xen_foreignmem_ops = &libxenforeignmem_backend_ops;
xen_xenstore_ops = &libxenstore_backend_ops;
}

4
hw/xen/xen_devconfig.c
View File

@ -11,11 +11,11 @@ static int xen_config_dev_dirs(const char *ftype, const char *btype, int vdev,
{
char *dom;
dom = xs_get_domain_path(xenstore, xen_domid);
dom = qemu_xen_xs_get_domain_path(xenstore, xen_domid);
snprintf(fe, len, "%s/device/%s/%d", dom, ftype, vdev);
free(dom);
dom = xs_get_domain_path(xenstore, 0);
dom = qemu_xen_xs_get_domain_path(xenstore, 0);
snprintf(be, len, "%s/backend/%s/%d/%d", dom, btype, xen_domid, vdev);
free(dom);

1
hw/xen/xen_pt_graphics.c
View File

@ -5,7 +5,6 @@
#include "qapi/error.h"
#include "xen_pt.h"
#include "xen-host-pci-device.h"
#include "hw/xen/xen-legacy-backend.h"
static unsigned long igd_guest_opregion;
static unsigned long igd_host_opregion;

49
hw/xen/xen_pvdev.c
View File

@ -54,31 +54,17 @@ void xen_config_cleanup(void)
struct xs_dirs *d;
QTAILQ_FOREACH(d, &xs_cleanup, list) {
xs_rm(xenstore, 0, d->xs_dir);
qemu_xen_xs_destroy(xenstore, 0, d->xs_dir);
}
}
int xenstore_mkdir(char *path, int p)
{
struct xs_permissions perms[2] = {
{
.id = 0, /* set owner: dom0 */
}, {
.id = xen_domid,
.perms = p,
}
};
if (!xs_mkdir(xenstore, 0, path)) {
if (!qemu_xen_xs_create(xenstore, 0, 0, xen_domid, p, path)) {
xen_pv_printf(NULL, 0, "xs_mkdir %s: failed\n", path);
return -1;
}
xenstore_cleanup_dir(g_strdup(path));
if (!xs_set_permissions(xenstore, 0, path, perms, 2)) {
xen_pv_printf(NULL, 0, "xs_set_permissions %s: failed\n", path);
return -1;
}
return 0;
}
@ -87,7 +73,7 @@ int xenstore_write_str(const char *base, const char *node, const char *val)
char abspath[XEN_BUFSIZE];
snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
if (!xs_write(xenstore, 0, abspath, val, strlen(val))) {
if (!qemu_xen_xs_write(xenstore, 0, abspath, val, strlen(val))) {
return -1;
}
return 0;
@ -100,7 +86,7 @@ char *xenstore_read_str(const char *base, const char *node)
char *str, *ret = NULL;
snprintf(abspath, sizeof(abspath), "%s/%s", base, node);
str = xs_read(xenstore, 0, abspath, &len);
str = qemu_xen_xs_read(xenstore, 0, abspath, &len);
if (str != NULL) {
/* move to qemu-allocated memory to make sure
* callers can savely g_free() stuff. */
@ -152,29 +138,6 @@ int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval)
return rc;
}
void xenstore_update(void *unused)
{
char **vec = NULL;
intptr_t type, ops, ptr;
unsigned int dom, count;
vec = xs_read_watch(xenstore, &count);
if (vec == NULL) {
goto cleanup;
}
if (sscanf(vec[XS_WATCH_TOKEN], "be:%" PRIxPTR ":%d:%" PRIxPTR,
&type, &dom, &ops) == 3) {
xenstore_update_be(vec[XS_WATCH_PATH], (void *)type, dom, (void*)ops);
}
if (sscanf(vec[XS_WATCH_TOKEN], "fe:%" PRIxPTR, &ptr) == 1) {
xenstore_update_fe(vec[XS_WATCH_PATH], (void *)ptr);
}
cleanup:
free(vec);
}
const char *xenbus_strstate(enum xenbus_state state)
{
static const char *const name[] = {
@ -299,9 +262,7 @@ void xen_pv_del_xendev(struct XenLegacyDevice *xendev)
}
if (xendev->fe) {
char token[XEN_BUFSIZE];
snprintf(token, sizeof(token), "fe:%p", xendev);
xs_unwatch(xenstore, xendev->fe, token);
qemu_xen_xs_unwatch(xenstore, xendev->watch);
g_free(xendev->fe);
}

26
include/hw/xen/xen-bus-helper.h
View File

@ -8,40 +8,40 @@
#ifndef HW_XEN_BUS_HELPER_H
#define HW_XEN_BUS_HELPER_H
#include "hw/xen/xen_common.h"
#include "hw/xen/xen_backend_ops.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,
void xs_node_create(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, unsigned int owner, unsigned int domid,
unsigned int perms, Error **errp);
void xs_node_destroy(struct qemu_xs_handle *h, 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,
void xs_node_vprintf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, va_list ap)
G_GNUC_PRINTF(6, 0);
void xs_node_printf(struct xs_handle *xsh, xs_transaction_t tid,
void xs_node_printf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, ...)
G_GNUC_PRINTF(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,
int xs_node_vscanf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, va_list ap)
G_GNUC_SCANF(6, 0);
int xs_node_scanf(struct xs_handle *xsh, xs_transaction_t tid,
int xs_node_scanf(struct qemu_xs_handle *h, xs_transaction_t tid,
const char *node, const char *key, Error **errp,
const char *fmt, ...)
G_GNUC_SCANF(6, 7);
/* Watch node/key unless node is empty, in which case watch key */
void xs_node_watch(struct xs_handle *xsh, const char *node, const char *key,
char *token, Error **errp);
void xs_node_unwatch(struct xs_handle *xsh, const char *node, const char *key,
const char *token, Error **errp);
struct qemu_xs_watch *xs_node_watch(struct qemu_xs_handle *h, const char *node,
const char *key, xs_watch_fn fn,
void *opaque, Error **errp);
void xs_node_unwatch(struct qemu_xs_handle *h, struct qemu_xs_watch *w);
#endif /* HW_XEN_BUS_HELPER_H */

17
include/hw/xen/xen-bus.h
View File

@ -9,29 +9,23 @@
#define HW_XEN_BUS_H
#include "hw/xen/xen_backend_ops.h"
#include "hw/xen/interface/io/xenbus.h"
#include "hw/sysbus.h"
#include "qemu/notify.h"
#include "qom/object.h"
typedef void (*XenWatchHandler)(void *opaque);
typedef struct XenWatchList XenWatchList;
typedef struct XenWatch XenWatch;
typedef struct XenEventChannel XenEventChannel;
struct XenDevice {
DeviceState qdev;
domid_t frontend_id;
char *name;
struct xs_handle *xsh;
XenWatchList *watch_list;
struct qemu_xs_handle *xsh;
char *backend_path, *frontend_path;
enum xenbus_state backend_state, frontend_state;
Notifier exit;
XenWatch *backend_state_watch, *frontend_state_watch;
struct qemu_xs_watch *backend_state_watch, *frontend_state_watch;
bool backend_online;
XenWatch *backend_online_watch;
struct qemu_xs_watch *backend_online_watch;
xengnttab_handle *xgth;
bool inactive;
QLIST_HEAD(, XenEventChannel) event_channels;
@ -64,10 +58,9 @@ OBJECT_DECLARE_TYPE(XenDevice, XenDeviceClass, XEN_DEVICE)
struct XenBus {
BusState qbus;
domid_t backend_id;
struct xs_handle *xsh;
XenWatchList *watch_list;
struct qemu_xs_handle *xsh;
unsigned int backend_types;
XenWatch **backend_watch;
struct qemu_xs_watch **backend_watch;
QLIST_HEAD(, XenDevice) inactive_devices;
};

6
include/hw/xen/xen-legacy-backend.h
View File

@ -2,7 +2,6 @@
#define HW_XEN_LEGACY_BACKEND_H
#include "hw/xen/xen_backend_ops.h"
#include "hw/xen/interface/io/xenbus.h"
#include "hw/xen/xen_pvdev.h"
#include "net/net.h"
#include "qom/object.h"
@ -16,7 +15,7 @@ DECLARE_INSTANCE_CHECKER(XenLegacyDevice, XENBACKEND,
TYPE_XENBACKEND)
/* variables */
extern struct xs_handle *xenstore;
extern struct qemu_xs_handle *xenstore;
extern const char *xen_protocol;
extern DeviceState *xen_sysdev;
extern BusState *xen_sysbus;
@ -31,9 +30,6 @@ int xenstore_write_be_int64(struct XenLegacyDevice *xendev, const char *node,
char *xenstore_read_be_str(struct XenLegacyDevice *xendev, const char *node);
int xenstore_read_be_int(struct XenLegacyDevice *xendev, const char *node,
int *ival);
void xenstore_update_fe(char *watch, struct XenLegacyDevice *xendev);
void xenstore_update_be(char *watch, char *type, int dom,
struct XenDevOps *ops);
char *xenstore_read_fe_str(struct XenLegacyDevice *xendev, const char *node);
int xenstore_read_fe_int(struct XenLegacyDevice *xendev, const char *node,
int *ival);

163
include/hw/xen/xen_backend_ops.h
View File

@ -12,6 +12,10 @@
#ifndef QEMU_XEN_BACKEND_OPS_H
#define QEMU_XEN_BACKEND_OPS_H
#include "hw/xen/xen.h"
#include "hw/xen/interface/xen.h"
#include "hw/xen/interface/io/xenbus.h"
/*
* For the time being, these operations map fairly closely to the API of
* the actual Xen libraries, e.g. libxenevtchn. As we complete the migration
@ -36,6 +40,16 @@ typedef uint32_t grant_ref_t;
#define XEN_PAGE_SIZE (1UL << XEN_PAGE_SHIFT)
#define XEN_PAGE_MASK (~(XEN_PAGE_SIZE - 1))
#ifndef xen_rmb
#define xen_rmb() smp_rmb()
#endif
#ifndef xen_wmb
#define xen_wmb() smp_wmb()
#endif
#ifndef xen_mb
#define xen_mb() smp_mb()
#endif
struct evtchn_backend_ops {
xenevtchn_handle *(*open)(void);
int (*bind_interdomain)(xenevtchn_handle *xc, uint32_t domid,
@ -240,6 +254,155 @@ static inline int qemu_xen_foreignmem_unmap(void *addr, size_t pages)
return xen_foreignmem_ops->unmap(addr, pages);
}
typedef void (*xs_watch_fn)(void *opaque, const char *path);
struct qemu_xs_handle;
struct qemu_xs_watch;
typedef uint32_t xs_transaction_t;
#define XBT_NULL 0
#define XS_PERM_NONE 0x00
#define XS_PERM_READ 0x01
#define XS_PERM_WRITE 0x02
struct xenstore_backend_ops {
struct qemu_xs_handle *(*open)(void);
void (*close)(struct qemu_xs_handle *h);
char *(*get_domain_path)(struct qemu_xs_handle *h, unsigned int domid);
char **(*directory)(struct qemu_xs_handle *h, xs_transaction_t t,
const char *path, unsigned int *num);
void *(*read)(struct qemu_xs_handle *h, xs_transaction_t t,
const char *path, unsigned int *len);
bool (*write)(struct qemu_xs_handle *h, xs_transaction_t t,
const char *path, const void *data, unsigned int len);
bool (*create)(struct qemu_xs_handle *h, xs_transaction_t t,
unsigned int owner, unsigned int domid,
unsigned int perms, const char *path);
bool (*destroy)(struct qemu_xs_handle *h, xs_transaction_t t,
const char *path);
struct qemu_xs_watch *(*watch)(struct qemu_xs_handle *h, const char *path,
xs_watch_fn fn, void *opaque);
void (*unwatch)(struct qemu_xs_handle *h, struct qemu_xs_watch *w);
xs_transaction_t (*transaction_start)(struct qemu_xs_handle *h);
bool (*transaction_end)(struct qemu_xs_handle *h, xs_transaction_t t,
bool abort);
};
extern struct xenstore_backend_ops *xen_xenstore_ops;
static inline struct qemu_xs_handle *qemu_xen_xs_open(void)
{
if (!xen_xenstore_ops) {
return NULL;
}
return xen_xenstore_ops->open();
}
static inline void qemu_xen_xs_close(struct qemu_xs_handle *h)
{
if (!xen_xenstore_ops) {
return;
}
xen_xenstore_ops->close(h);
}
static inline char *qemu_xen_xs_get_domain_path(struct qemu_xs_handle *h,
unsigned int domid)
{
if (!xen_xenstore_ops) {
return NULL;
}
return xen_xenstore_ops->get_domain_path(h, domid);
}
static inline char **qemu_xen_xs_directory(struct qemu_xs_handle *h,
xs_transaction_t t, const char *path,
unsigned int *num)
{
if (!xen_xenstore_ops) {
return NULL;
}
return xen_xenstore_ops->directory(h, t, path, num);
}
static inline void *qemu_xen_xs_read(struct qemu_xs_handle *h,
xs_transaction_t t, const char *path,
unsigned int *len)
{
if (!xen_xenstore_ops) {
return NULL;
}
return xen_xenstore_ops->read(h, t, path, len);
}
static inline bool qemu_xen_xs_write(struct qemu_xs_handle *h,
xs_transaction_t t, const char *path,
const void *data, unsigned int len)
{
if (!xen_xenstore_ops) {
return false;
}
return xen_xenstore_ops->write(h, t, path, data, len);
}
static inline bool qemu_xen_xs_create(struct qemu_xs_handle *h,
xs_transaction_t t, unsigned int owner,
unsigned int domid, unsigned int perms,
const char *path)
{
if (!xen_xenstore_ops) {
return false;
}
return xen_xenstore_ops->create(h, t, owner, domid, perms, path);
}
static inline bool qemu_xen_xs_destroy(struct qemu_xs_handle *h,
xs_transaction_t t, const char *path)
{
if (!xen_xenstore_ops) {
return false;
}
return xen_xenstore_ops->destroy(h, t, path);
}
static inline struct qemu_xs_watch *qemu_xen_xs_watch(struct qemu_xs_handle *h,
const char *path,
xs_watch_fn fn,
void *opaque)
{
if (!xen_xenstore_ops) {
return NULL;
}
return xen_xenstore_ops->watch(h, path, fn, opaque);
}
static inline void qemu_xen_xs_unwatch(struct qemu_xs_handle *h,
struct qemu_xs_watch *w)
{
if (!xen_xenstore_ops) {
return;
}
xen_xenstore_ops->unwatch(h, w);
}
static inline xs_transaction_t qemu_xen_xs_transaction_start(struct qemu_xs_handle *h)
{
if (!xen_xenstore_ops) {
return XBT_NULL;
}
return xen_xenstore_ops->transaction_start(h);
}
static inline bool qemu_xen_xs_transaction_end(struct qemu_xs_handle *h,
xs_transaction_t t, bool abort)
{
if (!xen_xenstore_ops) {
return false;
}
return xen_xenstore_ops->transaction_end(h, t, abort);
}
void setup_xen_backend_ops(void);
#endif /* QEMU_XEN_BACKEND_OPS_H */

1
include/hw/xen/xen_common.h
View File

@ -12,7 +12,6 @@
#include <xenctrl.h>
#include <xenstore.h>
#include "hw/xen/interface/io/xenbus.h"
#include "hw/xen/xen.h"
#include "hw/pci/pci_device.h"

2
include/hw/xen/xen_pvdev.h
View File

@ -39,6 +39,7 @@ struct XenLegacyDevice {
char name[64];
int debug;
struct qemu_xs_watch *watch;
enum xenbus_state be_state;
enum xenbus_state fe_state;
int online;
@ -64,7 +65,6 @@ int xenstore_write_int64(const char *base, const char *node, int64_t ival);
char *xenstore_read_str(const char *base, const char *node);
int xenstore_read_int(const char *base, const char *node, int *ival);
int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval);
void xenstore_update(void *unused);
const char *xenbus_strstate(enum xenbus_state state);

1
softmmu/globals.c
View File

@ -68,3 +68,4 @@ bool xen_domid_restrict;
struct evtchn_backend_ops *xen_evtchn_ops;
struct gnttab_backend_ops *xen_gnttab_ops;
struct foreignmem_backend_ops *xen_foreignmem_ops;
struct xenstore_backend_ops *xen_xenstore_ops;