From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: Re: [PATCH v8 2/7] Qemu-Xen-vTPM: Create a new file xen_pvdev.c Date: Mon, 22 Jun 2015 17:37:10 +0100 Message-ID: References: <1431840030-2797-1-git-send-email-quan.xu@intel.com> <1431840030-2797-4-git-send-email-quan.xu@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1431840030-2797-4-git-send-email-quan.xu@intel.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Quan Xu Cc: wei.liu2@citrix.com, stefanb@linux.vnet.ibm.com, stefano.stabellini@eu.citrix.com, qemu-devel@nongnu.org, xen-devel@lists.xen.org, dgdegra@tycho.nsa.gov, eblake@redhat.com List-Id: xen-devel@lists.xenproject.org On Sun, 17 May 2015, Quan Xu wrote: > for some common part of xen frontend and backend, such as xendevs > queue and xenstore update functions. > > Signed-off-by: Quan Xu Hi Quan, could you please separate out the code movement from any other changes? This patch would become two patches: the first would only move code from xen_backend.c to xen_pvdev.c, no other changes except for the ones actually required to build the code (Makefile.objs). The second patch would rename xen_be_find_xendev to xen_find_xendev and any other changes to the code that you making here. That way I can very easily go and look only at the things you actually modify. Thanks, Stefano > hw/display/xenfb.c | 4 +- > hw/xen/Makefile.objs | 2 +- > hw/xen/xen_backend.c | 353 ------------------------------- > hw/xen/xen_pvdev.c | 481 +++++++++++++++++++++++++++++++++++++++++++ > include/hw/xen/xen_backend.h | 13 +- > 5 files changed, 496 insertions(+), 357 deletions(-) > create mode 100644 hw/xen/xen_pvdev.c > > diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c > index 5e324ef..10751df 100644 > --- a/hw/display/xenfb.c > +++ b/hw/display/xenfb.c > @@ -988,8 +988,8 @@ void xen_init_display(int domid) > wait_more: > i++; > main_loop_wait(true); > - xfb = xen_be_find_xendev("vfb", domid, 0); > - xin = xen_be_find_xendev("vkbd", domid, 0); > + xfb = xen_find_xendev("vfb", domid, 0); > + xin = xen_find_xendev("vkbd", domid, 0); > if (!xfb || !xin) { > if (i < 256) { > usleep(10000); > diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs > index a0ca0aa..9ac9f7c 100644 > --- a/hw/xen/Makefile.objs > +++ b/hw/xen/Makefile.objs > @@ -1,5 +1,5 @@ > # xen backend driver support > -common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o > +common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o > > obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o > obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_msi.o > diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c > index b2cb22b..844f918 100644 > --- a/hw/xen/xen_backend.c > +++ b/hw/xen/xen_backend.c > @@ -44,86 +44,11 @@ > /* ------------------------------------------------------------- */ > > /* public */ > -XenXC xen_xc = XC_HANDLER_INITIAL_VALUE; > -struct xs_handle *xenstore = NULL; > const char *xen_protocol; > > /* private */ > -static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs = QTAILQ_HEAD_INITIALIZER(xendevs); > static int debug = 0; > > -/* ------------------------------------------------------------- */ > - > -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))) { > - return -1; > - } > - return 0; > -} > - > -char *xenstore_read_str(const char *base, const char *node) > -{ > - char abspath[XEN_BUFSIZE]; > - unsigned int len; > - char *str, *ret = NULL; > - > - snprintf(abspath, sizeof(abspath), "%s/%s", base, node); > - str = xs_read(xenstore, 0, abspath, &len); > - if (str != NULL) { > - /* move to qemu-allocated memory to make sure > - * callers can savely g_free() stuff. */ > - ret = g_strdup(str); > - free(str); > - } > - return ret; > -} > - > -int xenstore_write_int(const char *base, const char *node, int ival) > -{ > - char val[12]; > - > - snprintf(val, sizeof(val), "%d", ival); > - return xenstore_write_str(base, node, val); > -} > - > -int xenstore_write_int64(const char *base, const char *node, int64_t ival) > -{ > - char val[21]; > - > - snprintf(val, sizeof(val), "%"PRId64, ival); > - return xenstore_write_str(base, node, val); > -} > - > -int xenstore_read_int(const char *base, const char *node, int *ival) > -{ > - char *val; > - int rc = -1; > - > - val = xenstore_read_str(base, node); > - if (val && 1 == sscanf(val, "%d", ival)) { > - rc = 0; > - } > - g_free(val); > - return rc; > -} > - > -int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval) > -{ > - char *val; > - int rc = -1; > - > - val = xenstore_read_str(base, node); > - if (val && 1 == sscanf(val, "%"SCNu64, uval)) { > - rc = 0; > - } > - g_free(val); > - return rc; > -} > - > int xenstore_write_be_str(struct XenDevice *xendev, const char *node, const char *val) > { > return xenstore_write_str(xendev->be, node, val); > @@ -195,183 +120,6 @@ int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state) > } > > /* ------------------------------------------------------------- */ > - > -struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev) > -{ > - struct XenDevice *xendev; > - > - QTAILQ_FOREACH(xendev, &xendevs, next) { > - if (xendev->dom != dom) { > - continue; > - } > - if (xendev->dev != dev) { > - continue; > - } > - if (strcmp(xendev->type, type) != 0) { > - continue; > - } > - return xendev; > - } > - return NULL; > -} > - > -/* > - * get xen backend device, allocate a new one if it doesn't exist. > - */ > -static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, > - struct XenDevOps *ops) > -{ > - struct XenDevice *xendev; > - > - xendev = xen_be_find_xendev(type, dom, dev); > - if (xendev) { > - return xendev; > - } > - > - /* init new xendev */ > - xendev = g_malloc0(ops->size); > - xendev->type = type; > - xendev->dom = dom; > - xendev->dev = dev; > - xendev->ops = ops; > - > - snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d", > - xendev->type, xendev->dom, xendev->dev); > - snprintf(xendev->name, sizeof(xendev->name), "%s-%d", > - xendev->type, xendev->dev); > - > - xendev->debug = debug; > - xendev->local_port = -1; > - > - xendev->evtchndev = xen_xc_evtchn_open(NULL, 0); > - if (xendev->evtchndev == XC_HANDLER_INITIAL_VALUE) { > - xen_be_printf(NULL, 0, "can't open evtchn device\n"); > - g_free(xendev); > - return NULL; > - } > - fcntl(xc_evtchn_fd(xendev->evtchndev), F_SETFD, FD_CLOEXEC); > - > - if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) { > - xendev->gnttabdev = xen_xc_gnttab_open(NULL, 0); > - if (xendev->gnttabdev == XC_HANDLER_INITIAL_VALUE) { > - xen_be_printf(NULL, 0, "can't open gnttab device\n"); > - xc_evtchn_close(xendev->evtchndev); > - g_free(xendev); > - return NULL; > - } > - } else { > - xendev->gnttabdev = XC_HANDLER_INITIAL_VALUE; > - } > - > - QTAILQ_INSERT_TAIL(&xendevs, xendev, next); > - > - if (xendev->ops->alloc) { > - xendev->ops->alloc(xendev); > - } > - > - return xendev; > -} > - > -/* > - * release xen backend device. > - */ > -static struct XenDevice *xen_be_del_xendev(int dom, int dev) > -{ > - struct XenDevice *xendev, *xnext; > - > - /* > - * This is pretty much like QTAILQ_FOREACH(xendev, &xendevs, next) but > - * we save the next pointer in xnext because we might free xendev. > - */ > - xnext = xendevs.tqh_first; > - while (xnext) { > - xendev = xnext; > - xnext = xendev->next.tqe_next; > - > - if (xendev->dom != dom) { > - continue; > - } > - if (xendev->dev != dev && dev != -1) { > - continue; > - } > - > - if (xendev->ops->free) { > - xendev->ops->free(xendev); > - } > - > - if (xendev->fe) { > - char token[XEN_BUFSIZE]; > - snprintf(token, sizeof(token), "fe:%p", xendev); > - xs_unwatch(xenstore, xendev->fe, token); > - g_free(xendev->fe); > - } > - > - if (xendev->evtchndev != XC_HANDLER_INITIAL_VALUE) { > - xc_evtchn_close(xendev->evtchndev); > - } > - if (xendev->gnttabdev != XC_HANDLER_INITIAL_VALUE) { > - xc_gnttab_close(xendev->gnttabdev); > - } > - > - QTAILQ_REMOVE(&xendevs, xendev, next); > - g_free(xendev); > - } > - return NULL; > -} > - > -/* > - * Sync internal data structures on xenstore updates. > - * Node specifies the changed field. node = NULL means > - * update all fields (used for initialization). > - */ > -static void xen_be_backend_changed(struct XenDevice *xendev, const char *node) > -{ > - if (node == NULL || strcmp(node, "online") == 0) { > - if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) { > - xendev->online = 0; > - } > - } > - > - if (node) { > - xen_be_printf(xendev, 2, "backend update: %s\n", node); > - if (xendev->ops->backend_changed) { > - xendev->ops->backend_changed(xendev, node); > - } > - } > -} > - > -static void xen_be_frontend_changed(struct XenDevice *xendev, const char *node) > -{ > - int fe_state; > - > - if (node == NULL || strcmp(node, "state") == 0) { > - if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) { > - fe_state = XenbusStateUnknown; > - } > - if (xendev->fe_state != fe_state) { > - xen_be_printf(xendev, 1, "frontend state: %s -> %s\n", > - xenbus_strstate(xendev->fe_state), > - xenbus_strstate(fe_state)); > - } > - xendev->fe_state = fe_state; > - } > - if (node == NULL || strcmp(node, "protocol") == 0) { > - g_free(xendev->protocol); > - xendev->protocol = xenstore_read_fe_str(xendev, "protocol"); > - if (xendev->protocol) { > - xen_be_printf(xendev, 1, "frontend protocol: %s\n", xendev->protocol); > - } > - } > - > - if (node) { > - xen_be_printf(xendev, 2, "frontend update: %s\n", node); > - if (xendev->ops->frontend_changed) { > - xendev->ops->frontend_changed(xendev, node); > - } > - } > -} > - > -/* ------------------------------------------------------------- */ > /* Check for possible state transitions and perform them. */ > > /* > @@ -611,81 +359,6 @@ static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops) > return 0; > } > > -static void xenstore_update_be(char *watch, char *type, int dom, > - struct XenDevOps *ops) > -{ > - struct XenDevice *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_be_del_xendev(dom, dev); > - } else { > - free(bepath); > - xen_be_backend_changed(xendev, path); > - xen_be_check_state(xendev); > - } > - } > -} > - > -static 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); > -} > - > -static 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); > -} > - > static void xen_be_evtchn_event(void *opaque) > { > struct XenDevice *xendev = opaque; > @@ -706,32 +379,6 @@ static void xen_be_evtchn_event(void *opaque) > > /* -------------------------------------------------------------------- */ > > -int xen_be_init(void) > -{ > - xenstore = xs_daemon_open(); > - if (!xenstore) { > - xen_be_printf(NULL, 0, "can't connect to xenstored\n"); > - return -1; > - } > - > - if (qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL) < 0) { > - goto err; > - } > - > - if (xen_xc == XC_HANDLER_INITIAL_VALUE) { > - /* Check if xen_init() have been called */ > - goto err; > - } > - return 0; > - > -err: > - qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL); > - xs_daemon_close(xenstore); > - xenstore = NULL; > - > - return -1; > -} > - > int xen_be_register(const char *type, struct XenDevOps *ops) > { > return xenstore_scan(type, xen_domid, ops); > diff --git a/hw/xen/xen_pvdev.c b/hw/xen/xen_pvdev.c > new file mode 100644 > index 0000000..dac8639 > --- /dev/null > +++ b/hw/xen/xen_pvdev.c > @@ -0,0 +1,481 @@ > +/* > + * Xen para-virtualization device > + * > + * Copyright (c) 2015 Intel Corporation > + * Authors: > + * Quan Xu > + * > + * This library is free software; you can redistribute it and/or > + * modify it under the terms of the GNU Lesser General Public > + * License as published by the Free Software Foundation; either > + * version 2 of the License, or (at your option) any later version. > + * > + * This library is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * Lesser General Public License for more details. > + * > + * You should have received a copy of the GNU Lesser General Public > + * License along with this library; if not, see > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include "hw/hw.h" > +#include "sysemu/char.h" > +#include "qemu/log.h" > +#include "hw/xen/xen_backend.h" > + > +#include > + > +static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs = > + QTAILQ_HEAD_INITIALIZER(xendevs); > +static int debug; > + > +/* public */ > +XenXC xen_xc = XC_HANDLER_INITIAL_VALUE; > +struct xs_handle *xenstore; > + > +/* > + * find Xen device > + */ > +struct XenDevice *xen_find_xendev(const char *type, int dom, int dev) > +{ > + struct XenDevice *xendev; > + > + QTAILQ_FOREACH(xendev, &xendevs, next) { > + if (xendev->dom != dom) { > + continue; > + } > + if (xendev->dev != dev) { > + continue; > + } > + if (strcmp(xendev->type, type) != 0) { > + continue; > + } > + return xendev; > + } > + return NULL; > +} > + > +/* > + * get xen backend device, allocate a new one if it doesn't exist. > + */ > +struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, > + struct XenDevOps *ops) > +{ > + struct XenDevice *xendev; > + > + xendev = xen_find_xendev(type, dom, dev); > + if (xendev) { > + return xendev; > + } > + > + /* init new xendev */ > + xendev = g_malloc0(ops->size); > + xendev->type = type; > + xendev->dom = dom; > + xendev->dev = dev; > + xendev->ops = ops; > + > + snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d", > + xendev->type, xendev->dom, xendev->dev); > + snprintf(xendev->name, sizeof(xendev->name), "%s-%d", > + xendev->type, xendev->dev); > + > + xendev->debug = debug; > + xendev->local_port = -1; > + > + xendev->evtchndev = xen_xc_evtchn_open(NULL, 0); > + if (xendev->evtchndev == XC_HANDLER_INITIAL_VALUE) { > + xen_be_printf(NULL, 0, "can't open evtchn device\n"); > + g_free(xendev); > + return NULL; > + } > + fcntl(xc_evtchn_fd(xendev->evtchndev), F_SETFD, FD_CLOEXEC); > + > + if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) { > + xendev->gnttabdev = xen_xc_gnttab_open(NULL, 0); > + if (xendev->gnttabdev == XC_HANDLER_INITIAL_VALUE) { > + xen_be_printf(NULL, 0, "can't open gnttab device\n"); > + xc_evtchn_close(xendev->evtchndev); > + g_free(xendev); > + return NULL; > + } > + } else { > + xendev->gnttabdev = XC_HANDLER_INITIAL_VALUE; > + } > + > + QTAILQ_INSERT_TAIL(&xendevs, xendev, next); > + > + if (xendev->ops->alloc) { > + xendev->ops->alloc(xendev); > + } > + > + return xendev; > +} > + > +/* > + * get xen fe device, allocate a new one if it doesn't exist. > + */ > +struct XenDevice *xen_fe_get_xendev(const char *type, int dom, int dev, > + char *backend, struct XenDevOps *ops) > +{ > + struct XenDevice *xendev; > + > + xendev = xen_find_xendev(type, dom, dev); > + if (xendev) { > + return xendev; > + } > + > + /* init new xendev */ > + xendev = g_malloc0(ops->size); > + xendev->type = type; > + xendev->dom = dom; > + xendev->dev = dev; > + xendev->ops = ops; > + > + /*return if the ops->flags is not DEVOPS_FLAG_FE*/ > + if (!(ops->flags & DEVOPS_FLAG_FE)) { > + return NULL; > + } > + > + snprintf(xendev->be, sizeof(xendev->be), "%s", backend); > + snprintf(xendev->name, sizeof(xendev->name), "%s-%d", > + xendev->type, xendev->dev); > + > + xendev->debug = debug; > + xendev->local_port = -1; > + > + xendev->evtchndev = xen_xc_evtchn_open(NULL, 0); > + if (xendev->evtchndev == XC_HANDLER_INITIAL_VALUE) { > + xen_be_printf(NULL, 0, "can't open evtchn device\n"); > + g_free(xendev); > + return NULL; > + } > + fcntl(xc_evtchn_fd(xendev->evtchndev), F_SETFD, FD_CLOEXEC); > + > + if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) { > + xendev->gnttabdev = xen_xc_gnttab_open(NULL, 0); > + if (xendev->gnttabdev == XC_HANDLER_INITIAL_VALUE) { > + xen_be_printf(NULL, 0, "can't open gnttab device\n"); > + xc_evtchn_close(xendev->evtchndev); > + g_free(xendev); > + return NULL; > + } > + } else { > + xendev->gnttabdev = XC_HANDLER_INITIAL_VALUE; > + } > + > + QTAILQ_INSERT_TAIL(&xendevs, xendev, next); > + > + if (xendev->ops->alloc) { > + xendev->ops->alloc(xendev); > + } > + > + return xendev; > +} > + > +/* > + * release xen device > + */ > + > +struct XenDevice *xen_del_xendev(int dom, int dev) > +{ > + struct XenDevice *xendev, *xnext; > + > + /* > + * This is pretty much like QTAILQ_FOREACH(xendev, &xendevs, next) but > + * we save the next pointer in xnext because we might free xendev. > + */ > + xnext = xendevs.tqh_first; > + while (xnext) { > + xendev = xnext; > + xnext = xendev->next.tqe_next; > + > + if (xendev->dom != dom) { > + continue; > + } > + if (xendev->dev != dev && dev != -1) { > + continue; > + } > + > + if (xendev->ops->free) { > + xendev->ops->free(xendev); > + } > + > + if (xendev->fe) { > + char token[XEN_BUFSIZE]; > + snprintf(token, sizeof(token), "fe:%p", xendev); > + xs_unwatch(xenstore, xendev->fe, token); > + g_free(xendev->fe); > + } > + > + if (xendev->evtchndev != XC_HANDLER_INITIAL_VALUE) { > + xc_evtchn_close(xendev->evtchndev); > + } > + if (xendev->gnttabdev != XC_HANDLER_INITIAL_VALUE) { > + xc_gnttab_close(xendev->gnttabdev); > + } > + > + QTAILQ_REMOVE(&xendevs, xendev, next); > + g_free(xendev); > + } > + return NULL; > +} > + > +/* ------------------------------------------------------------- */ > + > +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))) { > + return -1; > + } > + return 0; > +} > + > +char *xenstore_read_str(const char *base, const char *node) > +{ > + char abspath[XEN_BUFSIZE]; > + unsigned int len; > + char *str, *ret = NULL; > + > + snprintf(abspath, sizeof(abspath), "%s/%s", base, node); > + str = xs_read(xenstore, 0, abspath, &len); > + if (str != NULL) { > + /* move to qemu-allocated memory to make sure > + * callers can savely g_free() stuff. */ > + ret = g_strdup(str); > + free(str); > + } > + return ret; > +} > + > +int xenstore_write_int(const char *base, const char *node, int ival) > +{ > + char val[12]; > + > + snprintf(val, sizeof(val), "%d", ival); > + return xenstore_write_str(base, node, val); > +} > + > +int xenstore_write_int64(const char *base, const char *node, int64_t ival) > +{ > + char val[21]; > + > + snprintf(val, sizeof(val), "%"PRId64, ival); > + return xenstore_write_str(base, node, val); > +} > + > +int xenstore_read_int(const char *base, const char *node, int *ival) > +{ > + char *val; > + int rc = -1; > + > + val = xenstore_read_str(base, node); > + if (val && 1 == sscanf(val, "%d", ival)) { > + rc = 0; > + } > + g_free(val); > + return rc; > +} > + > +int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval) > +{ > + char *val; > + int rc = -1; > + > + val = xenstore_read_str(base, node); > + if (val && 1 == sscanf(val, "%"SCNu64, uval)) { > + rc = 0; > + } > + g_free(val); > + return rc; > +} > + > +char *xenstore_get_domain_name(uint32_t domid) > +{ > + char *dom_path, *str, *ret = NULL;; > + > + dom_path = xs_get_domain_path(xenstore, domid); > + str = xenstore_read_str(dom_path, "name"); > + free(dom_path); > + if (str != NULL) { > + ret = g_strdup(str); > + free(str); > + } > + > + return ret; > +} > + > +/* > + * Sync internal data structures on xenstore updates. > + * Node specifies the changed field. node = NULL means > + * update all fields (used for initialization). > + */ > +void xen_be_backend_changed(struct XenDevice *xendev, const char *node) > +{ > + if (node == NULL || strcmp(node, "online") == 0) { > + if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) { > + xendev->online = 0; > + } > + } > + > + if (node) { > + xen_be_printf(xendev, 2, "backend update: %s\n", node); > + if (xendev->ops->backend_changed) { > + xendev->ops->backend_changed(xendev, node); > + } > + } > +} > + > +void xen_be_frontend_changed(struct XenDevice *xendev, const char *node) > +{ > + int fe_state; > + > + if (node == NULL || strcmp(node, "state") == 0) { > + if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) { > + fe_state = XenbusStateUnknown; > + } > + if (xendev->fe_state != fe_state) { > + xen_be_printf(xendev, 1, "frontend state: %s -> %s\n", > + xenbus_strstate(xendev->fe_state), > + xenbus_strstate(fe_state)); > + } > + xendev->fe_state = fe_state; > + } > + if (node == NULL || strcmp(node, "protocol") == 0) { > + g_free(xendev->protocol); > + xendev->protocol = xenstore_read_fe_str(xendev, "protocol"); > + if (xendev->protocol) { > + xen_be_printf(xendev, 1, "frontend protocol: %s\n", > + xendev->protocol); > + } > + } > + > + if (node) { > + xen_be_printf(xendev, 2, "frontend update: %s\n", node); > + if (xendev->ops->frontend_changed) { > + xendev->ops->frontend_changed(xendev, node); > + } > + } > +} > + > +static void xenstore_update_be(char *watch, char *type, int dom, > + struct XenDevOps *ops) > +{ > + struct XenDevice *xendev; > + char path[XEN_BUFSIZE], *bepath; > + unsigned int len, dev; > + > + len = snprintf(path, sizeof(path), "backend/%s/%d", type, dom); > + > + if (strstr(watch, path) == NULL) { > + 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_del_xendev(dom, dev); > + } else { > + free(bepath); > + xen_be_backend_changed(xendev, path); > + if (!(ops->flags & DEVOPS_FLAG_FE)) { > + xen_be_check_state(xendev); > + } > + } > + } > +} > + > +static 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); > +} > + > +static 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); > +} > + > +int xen_be_init(void) > +{ > + xenstore = xs_daemon_open(); > + if (!xenstore) { > + xen_be_printf(NULL, 0, "can't connect to xenstored\n"); > + return -1; > + } > + > + if (qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, > + NULL, NULL) < 0) { > + goto err; > + } > + > + if (xen_xc == XC_HANDLER_INITIAL_VALUE) { > + > + /* Check if xen_init() have been called */ > + goto err; > + } > + return 0; > + > +err: > + qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL); > + xs_daemon_close(xenstore); > + xenstore = NULL; > + > + return -1; > +} > diff --git a/include/hw/xen/xen_backend.h b/include/hw/xen/xen_backend.h > index 3b4125e..65476bf 100644 > --- a/include/hw/xen/xen_backend.h > +++ b/include/hw/xen/xen_backend.h > @@ -15,6 +15,8 @@ struct XenDevice; > #define DEVOPS_FLAG_NEED_GNTDEV 1 > /* don't expect frontend doing correct state transitions (aka console quirk) */ > #define DEVOPS_FLAG_IGNORE_STATE 2 > +/*dev is frontend device*/ > +#define DEVOPS_FLAG_FE 4 > > struct XenDevOps { > size_t size; > @@ -77,9 +79,18 @@ int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival); > int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval); > int xenstore_read_fe_uint64(struct XenDevice *xendev, const char *node, uint64_t *uval); > > +char *xenstore_get_domain_name(uint32_t domid); > + > const char *xenbus_strstate(enum xenbus_state state); > -struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev); > +struct XenDevice *xen_find_xendev(const char *type, int dom, int dev); > +struct XenDevice *xen_del_xendev(int dom, int dev); > +struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, > + struct XenDevOps *ops); > +struct XenDevice *xen_fe_get_xendev(const char *type, int dom, int dev, > + char *backend, struct XenDevOps *ops); > void xen_be_check_state(struct XenDevice *xendev); > +void xen_be_backend_changed(struct XenDevice *xendev, const char *node); > +void xen_be_frontend_changed(struct XenDevice *xendev, const char *node); > > /* xen backend driver bits */ > int xen_be_init(void); > -- > 1.8.3.2 >