[PATCH v2 16/22] mini-os: setup xenbus interface parameters

[Juergen Gross <jgross@suse.com>]

In order to support HVMlite we need to get the ring page and event
channel from the hypervisor via hypercalls. Move the already existing
get_xenbus() function from arm specific coding to xenbus/xenbus.c and
provide a similar paravirtualized function.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
---
 arch/arm/setup.c | 16 +---------------
 arch/x86/setup.c |  1 +
 events.c         |  3 +--
 include/xenbus.h |  3 +++
 xenbus/xenbus.c  | 40 +++++++++++++++++++++++++++++++---------
 5 files changed, 37 insertions(+), 26 deletions(-)

diff --git a/arch/arm/setup.c b/arch/arm/setup.c
index a021616..72e025a 100644
--- a/arch/arm/setup.c
+++ b/arch/arm/setup.c
@@ -25,20 +25,6 @@ extern char shared_info_page[PAGE_SIZE];
 
 void *device_tree;
 
-void get_xenbus(void)
-{
-    uint64_t value;
-
-    if (hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &value))
-        BUG();
-
-    start_info.store_evtchn = (int)value;
-
-    if(hvm_get_parameter(HVM_PARAM_STORE_PFN, &value))
-        BUG();
-    start_info.store_mfn = (unsigned long)value;
-}
-
 /*
  * INITIAL C ENTRY POINT.
  */
@@ -72,7 +58,7 @@ void arch_init(void *dtb_pointer, uint32_t physical_offset)
 
     /* Fill in start_info */
     get_console(NULL);
-    get_xenbus();
+    get_xenbus(NULL);
 
     gic_init();
 
diff --git a/arch/x86/setup.c b/arch/x86/setup.c
index 0c1f2ec..6645784 100644
--- a/arch/x86/setup.c
+++ b/arch/x86/setup.c
@@ -138,6 +138,7 @@ arch_init(void *par)
 	/* WARN: don't do printk before here, it uses information from
 	   shared_info. Use xprintk instead. */
 	get_console(par);
+	get_xenbus(par);
 	si = par;
 	memcpy(&start_info, si, sizeof(*si));
 
diff --git a/events.c b/events.c
index 76ea617..e8ef8aa 100644
--- a/events.c
+++ b/events.c
@@ -46,8 +46,7 @@ void unbind_all_ports(void)
 
     for ( i = 0; i < NR_EVS; i++ )
     {
-        if ( i == console_evtchn ||
-             i == start_info.store_evtchn)
+        if ( i == console_evtchn || i == xenbus_evtchn )
             continue;
 
         if ( test_and_clear_bit(i, bound_ports) )
diff --git a/include/xenbus.h b/include/xenbus.h
index d3bb7af..5646a25 100644
--- a/include/xenbus.h
+++ b/include/xenbus.h
@@ -29,6 +29,9 @@ struct xenbus_event {
 };
 typedef struct xenbus_event *xenbus_event_queue;
 
+extern uint32_t xenbus_evtchn;
+
+void get_xenbus(void *p);
 char *xenbus_watch_path_token(xenbus_transaction_t xbt, const char *path, const char *token, xenbus_event_queue *events);
 char *xenbus_unwatch_path_token(xenbus_transaction_t xbt, const char *path, const char *token);
 extern struct wait_queue_head xenbus_watch_queue;
diff --git a/xenbus/xenbus.c b/xenbus/xenbus.c
index 0ab387a..636786c 100644
--- a/xenbus/xenbus.c
+++ b/xenbus/xenbus.c
@@ -26,6 +26,7 @@
 #include <mini-os/sched.h>
 #include <mini-os/wait.h>
 #include <xen/io/xs_wire.h>
+#include <xen/hvm/params.h>
 #include <mini-os/spinlock.h>
 #include <mini-os/xmalloc.h>
 
@@ -62,6 +63,31 @@ struct xenbus_req_info
 #define NR_REQS 32
 static struct xenbus_req_info req_info[NR_REQS];
 
+uint32_t xenbus_evtchn;
+
+#ifdef CONFIG_PARAVIRT
+void get_xenbus(void *p)
+{
+    start_info_t *si = p;
+
+    xenbus_evtchn = si->store_evtchn;
+    xenstore_buf = mfn_to_virt(si->store_mfn);
+}
+#else
+void get_xenbus(void *p)
+{
+    uint64_t v;
+
+    if ( hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v) )
+        BUG();
+    xenbus_evtchn = v;
+
+    if( hvm_get_parameter(HVM_PARAM_STORE_PFN, &v) )
+        BUG();
+    xenstore_buf = (struct xenstore_domain_interface *)map_frame_virt(v);
+}
+#endif
+
 static void memcpy_from_ring(const void *Ring,
         void *Dest,
         int off,
@@ -269,7 +295,7 @@ static void xenbus_thread_func(void *ign)
             }
 
             wmb();
-            notify_remote_via_evtchn(start_info.store_evtchn);
+            notify_remote_via_evtchn(xenbus_evtchn);
         }
     }
 }
@@ -335,15 +361,11 @@ void init_xenbus(void)
 {
     int err;
     DEBUG("init_xenbus called.\n");
-    xenstore_buf = mfn_to_virt(start_info.store_mfn);
     create_thread("xenstore", xenbus_thread_func, NULL);
     DEBUG("buf at %p.\n", xenstore_buf);
-    err = bind_evtchn(start_info.store_evtchn,
-		      xenbus_evtchn_handler,
-              NULL);
-    unmask_evtchn(start_info.store_evtchn);
-    printk("xenbus initialised on irq %d mfn %#llx\n",
-	   err, (unsigned long long) start_info.store_mfn);
+    err = bind_evtchn(xenbus_evtchn, xenbus_evtchn_handler, NULL);
+    unmask_evtchn(xenbus_evtchn);
+    printk("xenbus initialised on irq %d\n", err);
 }
 
 void fini_xenbus(void)
@@ -425,7 +447,7 @@ static void xb_write(int type, int req_id, xenbus_transaction_t trans_id,
     xenstore_buf->req_prod += len;
 
     /* Send evtchn to notify remote */
-    notify_remote_via_evtchn(start_info.store_evtchn);
+    notify_remote_via_evtchn(xenbus_evtchn);
 }
 
 /* Send a mesasge to xenbus, in the same fashion as xb_write, and
-- 
2.6.6


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