Gerd Hoffmann wrote:
This adds a xen event channel implementation to qemu, intented to be
used by xenner (aka xen emulation).
The patch also adds a XenEvtOps struct with function pointers for the
xc_evtchn_* family, which is used to switch between libxenctrl and the
qemu implementation at runtime. By default libxenctrl is used.
I suppose the QEMU implementation is to eventually eliminate the need
for libxc? Do you also plan on doing a XenStore implementation within QEMU?
---
Makefile.target | 1 +
hw/xen_interfaces.h | 27 +++
hw/xen_machine_pv.c | 2 +
hw/xenner_libxc_evtchn.c | 396 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 426 insertions(+), 0 deletions(-)
create mode 100644 hw/xen_interfaces.h
create mode 100644 hw/xenner_libxc_evtchn.c
diff --git a/Makefile.target b/Makefile.target
index 5c97874..b88fd8f 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -521,6 +521,7 @@ endif
# xen backend driver support
XEN_OBJS := xen_machine_pv.o xen_backend.o xen_devconfig.o xen_domainbuild.o
XEN_OBJS += xen_console.o xen_framebuffer.o xen_disk.o xen_nic.o
+XEN_OBJS += xenner_libxc_evtchn.o
Historically, we didn't have directories in QEMU because we used CVS and
directories are a nightmare. With the shear number of files being added
for Xen, it probably makes sense to stick them all in a directory.
ifeq ($(CONFIG_XEN), yes)
OBJS += $(XEN_OBJS)
LIBS += $(XEN_LIBS)
diff --git a/hw/xen_interfaces.h b/hw/xen_interfaces.h
new file mode 100644
index 0000000..869b382
--- /dev/null
+++ b/hw/xen_interfaces.h
@@ -0,0 +1,27 @@
+#ifndef QEMU_XEN_INTERFACES_H
+#define QEMU_XEN_INTERFACES_H 1
Minor nit, make sure to have copyrights in all of your files.
+static void bind_port_peer(struct port *p, int domid, int port)
+{
+ struct domain *domain;
+ struct port *o;
+ char *msg = "ok";
Should be const char *.
+ domain = get_domain(domid);
+ o = domain->p+port;
+ if (!o->priv) {
+ msg = "peer not allocated";
+ } else if (o->peer) {
+ msg = "peer already bound";
+ } else if (p->peer) {
+ msg = "port already bound";
+ } else {
+ o->peer = p;
+ p->peer = o;
+ }
Watch the whitespace (you've got tabs all over).
+ if (debug)
+ fprintf(stderr, "xen ev:%3d: bind port %d domain %d <-> port %d domain %d
: %s\n",
+ p->priv->fd_read,
+ p->port, p->priv->domain->domid,
+ port, domid, msg);
+ put_domain(domain);
+}
+
+static void unbind_port(struct port *p)
+{
+ struct port *o;
+
+ o = p->peer;
+ if (o) {
+ if (debug)
+ fprintf(stderr,"xen ev:%3d: unbind port %d domain %d <-> port %d
domain %d\n",
+ p->priv->fd_read,
+ p->port, p->priv->domain->domid,
+ o->port, o->priv->domain->domid);
+ o->peer = NULL;
+ p->peer = NULL;
+ }
+}
+
+static void notify_send_peer(struct port *peer)
+{
+ uint32_t evtchn = peer->port;
+ write(peer->priv->fd_write, &evtchn, sizeof(evtchn));
Should be unix_write and should deal with errors.
Regards,
Anthony Liguori
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