stubdom: use PVFB so as to e.g. permit SDL display

This adds support in ioemu for PVFB frontend as stubdomain display.
This permits for instance to use SDL in dom0 to perform the eventual
display.

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>

diff --git a/fbfront.c b/fbfront.c
index bbe49b92a509f2590c79107aca71d2fd936a9f0c..4f5041ab6972c80d6d9dfd1c26262a7c59174d54 100644 (file)
--- a/fbfront.c
+++ b/fbfront.c
@@ -31,13 +31,6 @@ struct kbdfront_dev {
     char *nodename;
     char *backend;
 
-    char *data;
-    int width;
-    int height;
-    int depth;
-    int line_length;
-    int mem_length;
-
 #ifdef HAVE_LIBC
     int fd;
 #endif
@@ -316,7 +309,10 @@ struct fbfront_dev *init_fbfront(char *nodename, void *data, int width, int heig
     for (i = 0; mapped < mem_length && i < max_pd; i++) {
         unsigned long *pd = (unsigned long *) alloc_page();
         for (j = 0; mapped < mem_length && j < PAGE_SIZE / sizeof(unsigned long); j++) {
-            pd[j] = virt_to_mfn((unsigned long) data + mapped);
+            /* Trigger CoW */
+            * ((char *)data + mapped) = 0;
+            barrier();
+            pd[j] = virtual_to_mfn((unsigned long) data + mapped);
             mapped += PAGE_SIZE;
         }
         for ( ; j < PAGE_SIZE / sizeof(unsigned long); j++)

diff --git a/include/fbfront.h b/include/fbfront.h
index 502f0330a205c2bab774841ae5cb41a55489db46..fa98942e76372487908cb5345b8d8ae4ea57de0c 100644 (file)
--- a/include/fbfront.h
+++ b/include/fbfront.h
@@ -14,6 +14,9 @@
 #ifndef KEY_Q
 #define KEY_Q 16
 #endif
+#ifndef KEY_MAX
+#define KEY_MAX 0x1ff
+#endif
 
 
 struct kbdfront_dev;