From: kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk>
Date: Tue, 20 Jun 2006 17:51:46 +0000 (+0100)
Subject: [XEN] Xen always relinquishes VGA console to domain0 when domain0
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~15921^2~10
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/%22bookmarks://%22Dat/%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22Dat?a=commitdiff_plain;h=295173e3ca11d3326447ca1d36510905f7136d3e;p=xen.git

[XEN] Xen always relinquishes VGA console to domain0 when domain0
starts to boot (previous behaviour looked for console=tty0 on
dom0's command line). To prevent this 'console=vga[keep]' must
be specified.
Signed-off-by: Keir Fraser <keir@xensource.com>
---

diff --git a/docs/src/user.tex b/docs/src/user.tex
index abbc109be2..17f54020c1 100644
--- a/docs/src/user.tex
+++ b/docs/src/user.tex
@@ -1972,7 +1972,8 @@ editing \path{grub.conf}.
 \item [ console=$<$specifier list$>$ ] Specify the destination for Xen
   console I/O.  This is a comma-separated list of, for example:
   \begin{description}
-  \item[ vga ] Use VGA console and allow keyboard input.
+  \item[ vga ] Use VGA console (only until domain 0 boots, unless {\bf
+  vga[keep] } is specified).
   \item[ com1 ] Use serial port com1.
   \item[ com2H ] Use serial port com2. Transmitted chars will have the
     MSB set. Received chars must have MSB set.
diff --git a/xen/arch/ia64/xen/domain.c b/xen/arch/ia64/xen/domain.c
index e42b3249de..1d85033061 100644
--- a/xen/arch/ia64/xen/domain.c
+++ b/xen/arch/ia64/xen/domain.c
@@ -855,9 +855,7 @@ int construct_dom0(struct domain *d,
 	sprintf(si->magic, "xen-%i.%i-ia64", XEN_VERSION, XEN_SUBVERSION);
 	si->nr_pages     = max_pages;
 
-	/* Give up the VGA console if DOM0 is configured to grab it. */
-	if (cmdline != NULL)
-	    console_endboot(strstr(cmdline, "tty0") != NULL);
+	console_endboot();
 
 	printk("Dom0: 0x%lx\n", (u64)dom0);
 
diff --git a/xen/arch/ia64/xen/xensetup.c b/xen/arch/ia64/xen/xensetup.c
index 0ab92a0893..0f64691f4b 100644
--- a/xen/arch/ia64/xen/xensetup.c
+++ b/xen/arch/ia64/xen/xensetup.c
@@ -511,9 +511,8 @@ printk("About to call domain_create()\n");
 printk("About to call init_trace_bufs()\n");
     init_trace_bufs();
 
-    /* Give up the VGA console if DOM0 is configured to grab it. */
 #ifdef CONFIG_XEN_CONSOLE_INPUT	/* CONFIG_SERIAL_8250_CONSOLE=n in dom0! */
-    console_endboot(cmdline && strstr(cmdline, "tty0"));
+    console_endboot();
 #endif
 
     domain0_ready = 1;
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 01a6ab8722..b78bcb21b8 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -598,8 +598,7 @@ void __init __start_xen(multiboot_info_t *mbi)
 
     init_trace_bufs();
 
-    /* Give up the VGA console if DOM0 is configured to grab it. */
-    console_endboot(cmdline && strstr(cmdline, "tty0"));
+    console_endboot();
 
     /* Hide UART from DOM0 if we're using it */
     serial_endboot();
diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c
index bbb9f89a33..309411b387 100644
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -476,7 +476,11 @@ void init_console(void)
         if ( strncmp(p, "com", 3) == 0 )
             sercon_handle = serial_parse_handle(p);
         else if ( strncmp(p, "vga", 3) == 0 )
+        {
             vgacon_enabled = 1;
+            if ( strncmp(p+3, "[keep]", 6) == 0 )
+                vgacon_enabled++;
+        }
     }
 
     init_vga();
@@ -502,7 +506,7 @@ void init_console(void)
     }
 }
 
-void console_endboot(int disable_vga)
+void console_endboot(void)
 {
     int i, j;
 
@@ -532,8 +536,12 @@ void console_endboot(int disable_vga)
         printk("\n");
     }
 
-    if ( disable_vga )
-        vgacon_enabled = 0;
+    if ( vgacon_enabled )
+    {
+        vgacon_enabled--;
+        printk("Xen is %s VGA console.\n",
+               vgacon_enabled ? "keeping" : "relinquishing");
+    }
 
     /*
      * If user specifies so, we fool the switch routine to redirect input
diff --git a/xen/include/xen/console.h b/xen/include/xen/console.h
index b7232f305f..de95b7f769 100644
--- a/xen/include/xen/console.h
+++ b/xen/include/xen/console.h
@@ -15,7 +15,7 @@ void set_printk_prefix(const char *prefix);
 long read_console_ring(XEN_GUEST_HANDLE(char), u32 *, int);
 
 void init_console(void);
-void console_endboot(int disable_vga);
+void console_endboot(void);
 
 void console_force_unlock(void);
 void console_force_lock(void);